VESTEL LCD TV KIT 17MB82S SERVICE MODE ENTRY, TROUBLESHOOTING, GENERAL DESCRIPTION OF ICS AND MORE

  Used with Sharp LC39LD145, Finlux, Techwood 50A028, Vestel 49 inch LCD TV, Logik L24HEDPq4, Telefunken D32H278KT, Philips 40PFL3008H and more brand LCD TVs

17MB82S  Vestel main board is driven by MediaTek MT5820. This IC is capable of handling Video and audio processing, Scaling-Display processing, 3D comb filter, OSD and text processing, LVDS/mini-LVDS transmitting, channel and MPEG2/4 decoding, integrated DVB-T/C demodulator and media center functionality.
TV supports PAL, SECAM, NTSC color standards and multiple transmission standards as B/G, D/K, I/I’, and L/L’ including German and NICAM stereo. Also DVB T, DVB-C is supported internal demodulators of MediaTek IC and DVB-S/S2 is supported with external demodulator.
Sound system output is supplying max. 2x8W ( less 10%THD at max output) for stereo 8Ω speakers.
Supported peripherals are:
1 RF input VHF I, VHF III, UHF @ 75Ohm(Common)
1 Side AV (CVBS, R/L_Audio)
1 SCART socket(Common)
1 PC input(Common)
2 HDMI 1.3 input(1 HDMI input is common, 1 input is optional)
1 S/PDIF output(Optional)
1 Headphone(Optional)
1 Common interface(Common)
2 USB(1 USB input is common, 1 USB input is optional)
1 On-board Keypad(Optional)
1 External Touchpad(Optional)

  MxL601 is a highly integrated low-power silicon tuner IC targeting all global analog and digital cable standards as well as digital terrestrial reception standards. Broadband input filtering and channel filtering have been completely integrated on-chip. This integration enables a very compact design requiring a small footprint, low bill-of-materials cost, and low power consumption. A signal at the 753 RF input is filtered and converted to a programmable IF output up to 44MHz. Automatic gain control, LO generation, and channel selectivity functions are completely integrated on the chip, which simplifies board level design. All functions of the IC can be controlled via I2C interface. MxL601 is available in a 4 x 4 mm2 24-pin QFN package.
Features :
* Tuning range from 44MHz to 1002MHz
* Programmable channel bandwidths of 6, 7,and 8MHz
* Integrated channel filtering requiring no external SAW filter for digital applications

* Low power consumption with 3.3V and1.8V dual-supply operation351 mW (Digital Terrestrial)
* On-chip voltage regulator enables single supply 3.3V operation
* Programmable IF frequency and IF spectrum inversion
* Reference clock output available for re-use by demodulators and additional tuners in multi-channel applications
* Input power reporting
* General purpose open-drain output GPO available for controlling off-chip circuitry
* Integrated on-chip programmable loading capacitors for the reference crystal
* I2C-compatible digital control interface
* RoHS compliance.

The TAS5721 is a 15-W stereo or 2x10 W + 1x15 W2.1 device, efficient, digital audio-power amplifier for driving stereo bridge-tied speakers. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital audio processors and MPEG decoders. The device accepts a wide range of input data and data rates. A fully programmable data path routes these channels to the internal speaker drivers. The TAS5721 is a slave-only device receiving all clocks from external sources. The TAS5721 operates with a PWM carrier between a 384-kHz switching rate and a 352-KHz switching rate, depending on the input sample rate. Oversampling combined with a fourth- order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.
Features
• Audio Input/output
* 15Wx2 into 8Ω
* Supports Single Device 0.1, 2.0, 2.1 Modes
* Wide PVDD Range, From 4.5 V to 26 V Performance
* Efficient Class-D Operation Eliminates Need for Heat sinks
* Requires Only 3.3 V and PVDD
* One Serial Audio Input (Two Audio Channels)
* I2C Address Selection via PIN (Chip Select)
* Supports 8-kHz to 48-kHz Sample Rate (LJ/RJ/I2S)
* External Headphone-Amplifier Shutdown Signal
* Integrated CAP‐Free Headphone Amplifier
* Stereo Headphone (Stereo 2‐V RMS Line Driver) Outputs
• Audio/PWM Processing
* Independent Channel Volume Controls With The 24-dB to Mute
* Separate Dynamic Range Control for Satellite and Sub Channels
* 21 Programmable Biquads for Speaker EQ
* Programmable Coefficients for DRC Filters
* DC Blocking Filters
* Support for 3D Effects
• General Features
* Serial Control Interface Operational Without MCLK
* Factory-Trimmed Internal Oscillator for Automatic Rate Detection
* Surface Mount, 48-Pin, 7-mm × 7-mm HTQFP Package
* Thermal and Short-Circuit Protection

POWER STAGE
  The DC voltages required at various parts of the chassis and panel are provided by a main power supply unit. MB82S chassis can operate with PW05, IPS60, IPS70, IPS16, IPS17, IPS19, PW25, PW26, PW82-3, PW03, PW04, PW06, PW07 as main power supply and also with 12V adaptor.
Which power board can be used for board to board or cable connection?
Board to board (BTB) : PW05, IPS60, IPS70, IPS16, IPS17, IPS19
Power Cable : PW25, PW26, PW82-3, PW03, PW04, PW06, PW07
The power supplies generate 24V, 12V, 5V, 3,3V and 12V, 5V, 3.3V stand by mode DC voltages. Power stage which is on-chassis generates 5V, 3V3 stand by voltage and 12V, 8V, 5V, 3V3, 2.5V, 1,8V and 1,2V supplies for other different parts of the chassis. Chassis block diagram is indicated below.
The blocks on power block diagram is using dependent to main supply. For PW26 and PW27 just common blocks are enough for proper operation.
Short CCT Protection Circuit
Short circuit protection is necessary for protecting chassis and main IC against damages when any Vcc supply shorts to ground. Protect pin should be logic high while normal operation. When there is a short circuit protect pin should be logic low. After any short detection, SW forces LEDs on LED card to blink.

MT5820 (Main IC) (U1)
The MediaTek MT5820 family consists of a backend decoder and a TV controller and offers high integration for advanced applications. It combines a transport de-multiplexer, a high definition video decoder, an audio decoder, a dual-link LVDS transmitter, a mini-LVDS transmitter, an EPI transmitter and an NTSC/PAL/SECAM TV decoder with a 3D comb filter (NTSC/PAL). The MT5820 enables consumer electronics manufactures to build high quality, low cost and feature-rich DTV.
World-Leading Audio/Video Technology: The MT5820 supports Full-HD MPEG1/2/4/h.264/DiviX/VC1/RM/AVS/VP6/VP8 (option) video decoder standards, and JPEG. The MT5820 also supports MediaTek MDDiTM de-interlace solution can reach very smooth picture quality for motions. A 3D comb filter added to the TV decoder recovers great details for still pictures. The special color processing technology provides natural, deep colors and true studio quality video. Also, the MT5820 family has built-in high resolution and high-quality audio codec.
Rich Features for High Value Products: The MT5820 family enables true single-chip experience. It integrates high-quality HDMI1.4a, high speed VGA ADC, LVDS, mini-LVDS, EPI, USB2.0 receiver, TCON (option), panel overdrive (option).
WW Common Platform Capability: Reserved transport stream input is for external demodulator for other countries or areas. TV maker can easily port the same UI to worldwide TV models. Excellent adjacent and co-channel rejection capability grants customers never miss any wonderful stream. Professional error-concealment provides stable, smooth and mosaic-free video quality.
Key Features:
1. Worldwide multi-standard analog TV demodulator
2. Powerful CPU core
3. A transport de-multiplexer
4. A muti-standard video decoder
5. Rich format audio codec
6. HDMI1.4a receiver
7. Local dimming (LED backlight) (option)
8. TCON (option)
9. Panel overdrive control (option)
10. LVDS, mini-LVDS, EPI
Note: All packages are lead free.

Host CPU
­ ARM11 single core 700MHz
­ Floating Point Unit
­ 16K I-Cache and 16K D-Cache for ARM11 core
­ 128K L2 Cache
­ Boot ROM
­ Boot from serial flash, NAND flash
­ Supports security boot
­ JTAG ICE interface
­ Watch Dog timers

Transport Demultiplexer
­ New generation 2 demux design for transport stream (TS) process

­ Supports 1 serial TS input
­ Supports DVB-T/T2, DVB-C, DVB-S/S2, ARIB and DTMB TS input data rate and format
­ Supports multi standard hardware engines for TS encryption or decryption
­ Up to12 even/odd keys for playback decryption use; 4 even/odd keys for playback for record encryption
­ Supports 80 PID filters for playback use and another 64 PID filters for record use
­ Supports 80 section filters with bit-wise positive / negative mask
­ Supports hardware CRC-32 check
­ Supports PCR recovery function without VCXO
­ Supports a micro-processor for stream processing and video start code detection.

General Copy Protection Unit
­ Supports CPPM/CPRM
­ Supports AES with 128/192/256 bit key
­ Supports AACS
­ Supports DES/3DES
­ Supports SHA-1/224/256
­ Supports MD5
­ Supports CSS
­ Supports RC4
­ Random number generator
MPEG1 Decoder
MPEG2 Decoder
­ MPEG MP@ML, MP@HL
­ Supports de-blocking filter
­ Full-HD 30P dual decoder
MPEG4 Decoder (option)
­ ASP@L5
­ Full-HD 30P dual decoder

H.264 (MPEG4.10 / AVC) HD Decoder (option)
­ MP@L4.0, HP@L4.0, constrained BP@L3 video standard
­ Full-HD 30P dual decoder
VC-1 (SMPTE421M) Decoder (option)
­ MP@HL, AP@L3
­ WMV9 decoder MP@HL
­ Full-HD 30P dual decoder
DivX (XviD) Decoder (option)
­ DIVX3 / DIVX4 / DIVX5 / DIVX6 / DIVX HD
­ Full-HD 30P dual decoder
AVS Decoder (option)
­ Jizhun profile @Level 6.2 (supports 4:2:0 format)
­ Full-HD 30P dual decoder
RMVB Decoder (option)
­ RealVideo8/9/10
Full-HD 30P dual decoder
VP6 Decoder (option)
VP8 Decoder (option)
­ Supports 3D side-by-side Full-HD contents
­ Full-HD 30P dual decoder
MVC
­ H.264 stereo high profile Full-HD 60fps
2D Graphics
­ Supports multiple color modes
­ Point, horizontal/vertical line primitive drawings
­ Rectangle fill and gradient fill functions
­ Bitblt with transparent options
­ Alpha blending and optional pre-multiplied alpha composition Bitblt
­ Stretch Bitblt
­ YCbCr to RGB color space conversion
­ Supports index to direct mode bitblt
Image Resize
­ Supports 16bpp/32bpp direct color format
­ Supports 420/422 video format
­ Supports 420/422/444 JPEG format
­ Arbitrary ratio vertical/horizontal scaling of video, from 1/128X to 128X
­ Simple DMA
­ Supports MMU in OSD mode
OSD Plane
­ Three linking list OSDs with multiple color mode and all of them have up-scaler
­ Supports stereo OSD.

Video Plane
­ Supports video freeze and over scan
­ Flesh tone management
­ Gamma correction
­ Color Transient Improvement (CTI)
­ 2D Peaking
­ Saturation/hue adjustment
­ Brightness and contrast adjustment
­ Black and White level extender
­ Adaptive Luma management
­ Automatic detect video, film and mixed-mode source
­ 3:2/2:2 pull down source detection
­ Supports FHD motion-adaptive de-interlace
­ Supports excellent low angle image processing
­ Brilliant boundary shaping for moving object
­ Advanced non-linear panorama scaling
­ Programmable zoom viewer
­ Progressive scan output
­ Supports alpha blending for OSD on video plane
­ Dithering processing for flat panel display
­ Frame rate conversion
­ Supports FHD panel and VGA dot-to-dot
­ Supports PIP/POP, (dual de-interlace, one HD and one SD)
OD (option)
­ Supports 60Hz Full-HD and WXGA panel over drive
TCON (option)
­ Flexible timing control with programmable timing
­ Horizontal timing control
­ Vertical timing control
­ Multi-line timing control
­ Multi-frame timing control
­ Supports gate power modulation timing
­ Supports command-based timing
­ Supports POL inversion every 30 seconds
­ Supports 1/2/4/8 frame inversion, 1-line inversion, 2-line inversion, and could up to 255-
line dot inversion
Local Dimming
­ Block division: up to 800 total blocks, up to 100 horizontal blocks
­ Supports 50K ~ 50M SPI clock rate
LVDS
­ Supports 6/8/10-bit one-link, 6/8/10-bit dual-link LVDS transmitter
­ Built-in spread spectrum for EMI performance
­ Programmable panel timing output
Mini-LVDS
­ Dual port 8-bit 6 pairs mini-LVDS output.

EPI
­ 6 port, 8/10-bit EPI
CVBS In
­ On-chip 54 MHz 10-bit video ADC
­ Supports PAL (B,G,D,H,M,N,I,Nc), NTSC, NTSC-4.43, SECAM
­ NTSC/PAL supports 3D/2D comb filter
­ Built-in motion-adaptive 3D Noise Reduction
­ VBI data slicer for CC/TT decoding
­ Supports 1 S-Video
­ Supports 2-channel CVBS
­ Supports SCART connector
VGA In
­ Supports VGA input up to UXGA 162 MHz
­ Supports full VESA standards
Component Video In
­ Supports 2 component video inputs
­ Supports 480i / 480p / 576i / 576p / 720p / 1080i / 1080p
Audio ADC
­ Supports 2-pair L/R input
Audio digital input
­ Supports 1 bit (2 channel) I2S audio input
HDMI Receiver
­ Four channel HDMI1.4a
­ Maximum data rate can be up to 3.3 GHz
­ Audio return channel
­ EIA/CEA-861B
­ CEC
Video bypass
­ ATV bypass
­ CVBS Monitor (any AV or S-video input)
TV audio demodulator
­ Supports BTSC / EIA-J / A2 / NICAM / PAL FM / SECAM world-wide formats
­ Standard automatic detection
­ Stereo demodulation, SAP demodulation
­ Mode selection (Main/SAP/Stereo
Audio DAC
­ Supports 2-pair audio DACs
DRAM Controller
­ 16-bit DDR2/DDR3 interface
­ Supports DDR2 1066Mhz, DDR3 1333Mhz

­ Supports 512Mb or 1Gb or 2Gb DDR2 and DDR3 DRAM device
­ Supports DDR2-1066/DDR3-1333/DDR3-1600 device
Audio DSP
­ Supports AC-3 (Dolby Digital) decoding and E-AC3 (Dolby Digital Plus) decoding (option)
­ MPEG-1 layer I/II decoding
­ Supports WMA / HE-AAC (option)
­ Support Dolby DDCO, and MS10 (option)
­ Dolby Prologic II (option)
­ Audio output: 5.1ch + 2ch (down mix) + 2ch(bypass)
­ Pink noise and white noise generator
­ Equalizer
­ Bass management
­ 3D surround processing with virtual surround
­ Audio and video lip synchronization
­ Supports bass/treble
­ Automatic volume control
­ Supports 5-bit (10-channel) main audio I2S output interface, each of these channels is up
to 24-bit resolution
S/PDIF interface
­ Supports SPDIF in bypass
­ SPDIF out
Analog TV IF Demodulator
­ Supports world-wide analog TV standard
­ Accept direct IF and low IF
­ Full digital AGC control and carrier recovery
­ Embedded SAW filter and IF Amplifier. Cost effective TV front-end structure and no more cost on:
­ External analog SAW filters (Video/Audio)
­ External analog IF demodulator
­ External peripheral circuit on CVBS signal data path
­ External SAW filter and IF VGA on tuner
Peripherals
­ Three built-in UARTs with Tx and Rx FIFO
­ Ten basic serial interfaces: one is for the tuner, four are the masters for general purpose and two of them can be active in standby mode, one is the slave for VGA DDC, the other four extra slave serial interfaces used for HDMI
EDID data
­ Five PWMs, two of them can be active in standby mode
­ IR receiver
­ Real-time clock and watchdog controller
­ Built-in 2-link USB2.0/1.1, both of them support external hub with 16 endpoints.
­ Built-in uP for standby mode
­ Supports SDIO interface
­ Supports smart card interface.

­ Supports two serial flash or one serial and one NAND flash
­ Supports 4-input low-speed ADC
­ Supports boundary scan (JTAG)
IC Outline
­ LQFP Package 256 pins with E-pad
­ 3.3V/1.2V and 1.8V for DDR2 or 1.5V for DDR3

USB INTERFACE
Main Concept IC has integrated 2 USB 2.0 interface. One of them is used for Ethernet function, the other one is used for USB connectivity for last user. Last user can play video, picture and audio files. Also digital channels can be record to external storage device by this interface. All SW files can be updated with interface.
USB circuit has 3 main parts
· Integrated USB 2.0 Host interface of D3K
· Protection IC
· Over Current Protection IC

DDR3 SDRAM 1Gb G-die
Description:
The 1Gb DDR3 SDRAM G-die is organized as a 8Mbit x 16 I/Os x 8banks device. This synchronous device achieves high speed double-data-rate transfer rates of up to 2133Mb/sec/pin(DDR3-2133)for general applications. The chip is designed to comply with the following key DDR3 SDRAM features such as posted CAS, Programmable CWL, Internal (Self) Calibration, On Die Termination using ODT pin and Asynchronous Reset . All of the control and address inputs are synchronized with a pair of externally supplied differential clocks. Inputs are latched at the cross point of differential clocks (CK rising and CK falling). All I/Os are synchronized with a pair of bidirectional strobes (DQS and DQS) in a source synchronous fashion. The address bus is used to convey row, column, and bank address information in a RAS/CAS multiplexing style. The DDR3 device operates with a single 1.5V ± 0.075V power supply and 1.5V ± 0.075V VDDQ. The 1Gb DDR3 G-die device is available in 96ball FBGA(x16).
Features
• JEDEC standard 1.5V ± 0.075V Power Supply
• VDDQ = 1.5V ± 0.075V
• 533MHz fCK for 1066Mb/sec/pin, 667MHz fCK for 1333Mb/sec/pin, 800MHz fCK for 1600Mb/sec/pin, 933 MHz fCK for 1866Mb/sec/pin, 1066 MHz fCK for 2133Mb/sec/pin
• 8 Banks
• Programmable CAS Latency(posted CAS): 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
• Programmable Additive Latency: 0, CL-2 or CL-1 clock
• Programmable CAS Write Latency (CWL) = 6 (DDR3-1066),

 (DDR3-1333), 8 (DDR3-1600), 9 (DDR3-1866), 10 (DDR3-2133)
• 8-bit pre-fetch
• Burst Length: 8 (Interleave without any limit, sequential with starting address “000” only), 4 with tCCD = 4 which does not allow seamless read or write [either On the fly using A12 or MRS]
• Bi-directional Differential Data-Strobe
• Internal(self) calibration : Internal self calibration through ZQ pin (RZQ : 240 ohm ± 1%)
• On Die Termination using ODT pin
• Average Refresh Period 7.8us at lower than TCASE 85°C, 3.9us at 85°C < TCASE < 95 °C
• Asynchronous Reset
• Package : 96 balls FBGA - x16
• All of Lead-Free products are compliant for RoHS
• All of products are Halogen-free.

Panel Supply Switch Circuit
This switch is used to open and close panel supply of TCON. It is controlled by port of main controller. Also with this circuit panel sequence could be adjusted correctly. 3 panel supplies are connected to this circuit. All of them are optional according to panels.

SPI FLASH MEMORY
EN25Q64 64 Megabit Serial Flash Memory with 4Kbyte Uniform Sector
General Description
The EN25Q64 is a 64 Megabit (8192K-byte) Serial Flash memory, with advanced write protection mechanisms. The EN25Q64 supports the standard Serial Peripheral Interface (SPI), and a high performance Dual output as well as Quad I/O using SPI pins: Serial Clock, Chip Select, Serial DQ0(DI), DQ1(DO), DQ2(WP#) and DQ3(NC). SPI clock frequencies of up to 50MHz are supported allowing equivalent clock rates of 100MHz for Dual Output and 200MHz for Quad Output when using the Dual/Quad Output Fast Read instructions. The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction. The EN25Q64 is designed to allow either single Sector/Block at a time or full chip erase operation. The EN25Q64 can be configured to protect part of the memory as the software protected mode. The device can sustain a minimum of 100K program/erase cycles on each sector or block.

EN25QH16 16 Megabit Serial Flash Memory with 4Kbyte Uniform Sector
General Description
The EN25QH16 is a 16 Megabit (2,048 K-byte) Serial Flash memory, with enhanced write protection mechanisms. The EN25QH16 supports the standard Serial Peripheral Interface (SPI), and a high performance Dual/Quad output as well as Dual/Quad I/O using SPI pins: Serial Clock, Chip Select, Serial DQ0(DI), DQ1(DO), DQ2(WP#) and DQ3(HOLD#). SPI clock frequencies of up to 80MHz are supported allowing equivalent clock rates of 160MHz (80MHz x 2) for Dual Output and 320MHz (80MHz x 4) for Quad Output when using the Dual/Quad I/O Fast Read instructions. The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction. The EN25QH16 is designed to allow either single Sector/Block at a time or full chip erase operation. The EN25QH16 can be configured to protect part of the memory as the software protected mode. The device can sustain a minimum of 100K program/erase cycles on each sector or block.

I-LM1117/LM 800mA Low-Dropout Linear Regulator
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It has the same pin-out as National Semiconductor’s industry standard LM317.
The LM1117 is available in an adjustable version, which can set the output voltage from 1.25V to 13.8V with only two external resistors. In addition, it is also available in five fixed voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V. The LM1117 offers current limiting and thermal shutdown. Its circuit includes a zener trimmed band gap reference to assure output voltage accuracy to within ±1%. The LM1117 series is available in SOT-223, TO-220, and TO-252 D-PAK packages. A minimum of 10μF tantalum capacitor is required at the output to improve the transient response and stability.
Features
Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
*  Space Saving SOT-223 Package
* Current Limiting and Thermal Protection
* Output Current 800mA
* Line Regulation 0.2% (Max)
* Load Regulation 0.4% (Max)
* Temperature Range
* LM1117 0°C to 125°C
* LM1117I -40°C to 125°C
Applications
* 2.85V Model for SCSI-2 Active Termination
* Post Regulator for Switching DC/DC Converter
* High Efficiency Linear Regulators
* Battery Charger
* Battery Powered Instrumentation.

SERVICE MENU SETTINGS
In order to reach service menu, First Press “MENU” Then press the remote control code two times, which is “4725”.
In first screen following items can be seen (MB8x is same as MB6x service menu):

USB Operations
USB operations option can not be used directly. It can be used for updating panel tool, hw configuration etc.

SOFTWARE UPDATE
In MB82 project there is only one software. From following steps software update procedure can be seen:
1. MB82.bin directly inside of a flash memory(not in a folder).
2. Put flash memory to the TV when TV is powered off.
3. Power on the and press OK button on the remote control when the tv is opened.
4. If First Time Installation screen comes, it means software update procedure is successful.

No Backlight Problem
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.  Possible causes: Backlight pin, dimming pin, backlight supply, stby on/off pin Backlight pin should be high in open position. If it is low, please check Q30 and panel cables.

Dimming pin should be high or square wave in open position. If it is low, please check S16 for Mstar side and panel or power cables, connectors.

Backlight power supply should be in panel specs. Please check CN4 for MB82, related connectors for power supply cards.

STBY_ON/OFF should be low for standby on condition, please check R2090.

CI Module Problem
Problem: CI is not working when CI module inserted.
Possible causes: Supply, supply control pin, detect pins, mechanical positions of pins
CI supply should be 5V when CI module inserted. If it is not 5V please check CI_POWER_CTRL, this pin should be low.

Check mechanical positions of CI module.
Detect ports should be low. If it is not low please check CI connector pins, CI module pins and 3V3_VCC on MB82.

Led Blinking Problem
Problem: LED blinking, no other operation
This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal operation. When there is a short circuit protect pin will be logic low. If you detect logic low on protect pin, unplug the TV set and control voltage points with a multimeter to find the shorted voltage to ground.

IR Problem
Problem: LED or IR not working
Check LED card supply on MB82 chassis.

Keypad Touchpad Problems
Problem: Keypad or Touchpad is not working
Check keypad supply and KEYBOARD pin on MB82

USB Problems
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V.

No Sound Problem
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC or 12V_VCC with a voltage-meter.
There may be a problem in headphone connector or headphone detect circuit (when headphone is connected, speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3v.

No Sound Problem at Headphone
Problem: No audio at headphone output.
Check HP detect pin, when headphone is. Check 5V_VCC and 3V3_VCC with a voltage.

Standby On/Off Problem
Problem:
Device cannot boot, TV hangs in standby mode.
There may be a problem about power supply. Check 12V_VCC, 5V_VCC and 3V3_VCC with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW. Additionally it is goood to check SW printouts via hyper-terminal (or Teraterm). These
printouts may give a clue about the problem.

No Signal Problem
Problem: No signal in TV mode.
Check tuner supply voltage; 3V3_TUN. Check tuner options are correctly set in Service
menu. Check AGC voltage at IF_AGC pin of tuner.

HAIER L37TA6A LCD TV – PCB CONNECTION DETAILS, SCHEMATIC DIAGRAMS AND INTERFACE DETAILS

Haier L26TA5A, L32TA6A, L26TA6A, L37TA5A, L32TA5A, L37TA6A   LCD TV – PCB connection details, schematic diagrams and interface details

This chassis is used to match and connect the big screen LCD TV, it supports multi-system TV input signal.  it can stored 128 TV programs at most, at the same time the highest resolution of this chassis can be up to SXGA or appear R, G, B input signal of WXGA of 16:9 again, color appear again can support 24 bit, and it
can realize synchronous automatic check. It can support 1080P HD signal input at most, and includes two rows CVBS signal, one row S terminal signal input, one row HDMI signal one row CVBS signal output.
Inbuilt 2x10W medium sound + 2x3W treble sound output, four rows two channels external audio signal input, one row sound output. Support left and right sound balance, equalizer adjustment function.
Meanwhile, this chassis can support TV signal and digital display in HD signal at the same time, and there are 3A picture optimize, 3A demo.

This chassis use new HYF-35R remote controller (grey, 41 button, can not share with the original blue 35 button HYF-35R ), the method to enter the factory mode is: Screen-----P.STD------S.STD------Sleep Time.
The following is the instructions of the factory menu of V2.1 version program.

The sound box part and the structure of complete set is separable, so it need install solely.

1. Power interface: supply the working power to chassis from power board..
2. Background light control panel interface: control the switch and brightness of screen background light.

3. Remote control interface: support Toshiba receiving negotiation.
4. Control panel interface: 7 button control.
5. Sound output interface: sound signal output.
6. Program upgrading interface: upgrading program. Only for factory use.

Interface definition

DVB-T module

This chassis is DVB-T digital module, it can receive European digital broadcasting TV.

Interface definition

1.Power interface 1： Supply the working power to chassis from power board.
2. Power interface 2： Supply the working power to electric tuner from power board.

3. Sound output interface: Output the sound signal to the interface of speaker.
4. Signal interface： Output the image signal to the interface of image source..
5. Control panel interface： Connect control panel, press 7 button to control.
6. Speaker interface： Output the sound signal to the interface of speaker.
7. Serial port interface： For updating the process. Only use for factory.

PCB dimension specification

(1)PCB thick + the height of the tiptop component=20 mm
(2)PCB = 140mm*140mm
Screw hole specification: diameter 3.5 mm ,the hole position structure diagram.

Schematic

VESTEL 17MB230 HOW TO ENTER THE SERVICE MODE - VESTEL 17MB230 IDTV – FOR VESTEL, REGAL, FINLUX, TELEFUNKEN AND MANY OTHER BRAND LCD TVS

17MB230 main board is driven by Novatek SOC. This IC is a single chip iDTV solution which compliants with variety ATV as NTSC, PAL and SECAM, and DTV standards as ISDB-T, DVB-T/-T2/-C/-S/-S2/-S2X, ITU-T J.83B, 8VSB, DTMB, integrates DTV and multi-media AV decoder, SIF demodulator, and support A/V post-processing

SERVICE MENU SETTINGS
In order to reach service menu, first Press “MENU” button, then write “4725” by using remote controller.  

You can see the service menu main screen. 

You can check SW releases by using this menu. In addition, you can make changes on video, audio etc. by using video settings, audio settings titles.

T/T2/C/A TUNER (U1)

The MxL661 is a highly integrated low-power silicon tuner IC that targets all global and digital cable standards. Broadband input filtering and channel filtering have been completely integrated on-chip. This integration enables a compact design resulting in small footprint, low Bill-Of-Material (BOM) cost, and low-power consumption.
A signal at the 75ohm RF input is filtered and converted to a programmable IF output frequency. Automatic Gain Control (AGC), LO generation, and channel selectivity functions are completey integrated on the chip. All functions of the IC can be controlled using the I2C interface.  The MxL is available in a 4 mm x 4mm x 0.85mm3, 24-pin QFN package.

• Tuning range from 44MHz to 1002MHz
• Programmable channel bandwidths of 6, 7, and 8MHz
• Integrated channel filtering
• Low power consumption with 3.3V and 1.8V dual-supply operation - 351 MW (digital terrestrial)
• On-chip voltage regulator enables single supply 3.3V operation
• Programmable IF frequency and IF spectrum inversion
• Programmable RF to IF delay for ATV scrambling systems that relies on the H-Sync method
• Optional balun-less application note for cost-sensitive applications
• Reference clock output available for re-use by demodulators and additional tuners in multi-channel applications
• Input power reporting
• Open-drain General Purpose Output GPO available for controlling off-chip circuitry
• I2C compatible digital control interface
• RoHS compliance.

S/S2 TUNER (U142)

The AV2018 is a highly integrated silicon tuner for DVB-S2 standard. It integrates a synthesizer, crystal oscillator, LDO, loop through path, and a direct conversion receiver including LNA, RF variable gain amplifiers, Mixer, programmable channel filter, and PGA.  The low noise figure of the receiver and loop through path eliminates the need of an external LNA. The integrated crystal oscillator can provide a reference clock for demodulator. The LDO supplies all the internal blocks the only an external voltage source is required. The AV2018 requires only a small number of external components, thus enables very competitive design.  The AV2018 implements an automatic gain control mechanism that only an analog control signal from the demodulator is required to from a close-loop gain control. The mechanism will arrange the gain of the receiver blocks to achieve best performance according to the control signal voltage. The embedded automatic calibration mechanism provides precise control of channel filter bandwidth and DC offset, no additional calibration procedure is required.

• Input RF Frequency: 950Mhz to 2150Mhz
• Single +3.3V power Supply
• Embedded LNA, Mixer, VCO, crystal oscillator, and LDO
• Low Noise Figure: 5 dB, typical
• Embedded DC offset Cancellation Circuit
• Programmable channel filter with bandwith from 4MHz to 40MHz
• Automatic gain control
• Embedded RF signal loop through path
• Single-ended I/Q interface
• QFN3*3mm 16pin package.

MAIN AMPLIFIER (U9)(6-8-10 W OPTION)

AD82587D is a digital audio amplifier capable of driving a pair of 8 ohm, 20W or a single 4ohm, 40W speaker, both which operate with play music at a 24V supply without external heat-sink or fan requirement.  Using I2C digital control interface, the user can control AD82587D’s input format selection, mute and volume control functions. AD82587D has many built-in protection circuits to safeguard AD82587D from connection errors.

• 16/18/20/24-bit input with I2S, Left-alignment and Right-alignment data format
• PSNR & DR(A-weighting) Loudspeaker: 97dB (PSNR), 105dB (DR) @ 24V
• Multiple sampling frequencies (Fs)
 32kHz / 44.1kHz / 48kHz and
 64kHz / 88.2kHz / 96kHz and
 128kHz/176.4kHz/192kHz
• System clock = 64x, 128x, 256x, 384x, 512x, 768x,1024x Fs
 256x~1024x Fs for 32kHz / 44.1kHz / 48kHz
 128x~512x Fs for 64kHz / 88.2kHz / 96kHz

  64x~256x Fs for 128kHz /176.4kHz/192kHz
• Supply voltage
 3.3V for digital circuit
 10V~26V for loudspeaker driver
• Loudspeaker output power for Stereo@ 24V
 10W x 2ch into 8_ @ 0.16% THD+N

 15W x 2ch into 8_ @ 0.18% THD+N
 20W x 2ch into 8_ @ 0.24% THD+N
• Loudspeaker output power for Mono@ 24V
 20W x 1ch into 4_ @ 0.17% THD+N
 30W x 1ch into 4_ @ 0.2% THD+N
 40W x 1ch into 4_ @ 0.24% THD+N
• Sounds processing including:
 Volume control (+24dB~-103dB, 0.125dB/step)
 Dynamic range control
 Power clipping
 Channel mixing
 User programmed noise gate with hysteresis window
 DC-blocking high-pass filter
• Anti-pop design
• Short circuit and over-temperature protection
• I2C control interface with selectable device address
• Internal PLL
• LV Under-voltage shutdown and HV Under-voltage
• detection
• Power saving mode
• Dynamic temperature control.

SUBWOOFER AMPLIFIER (U8) (12 W)

AD82586C is a digital audio amplifier capable of driving a pair of 8 ohm, 20W operating at 24V supply without external heat-sink or fan requirement with play music.  AD82586C has 20 bands EQ function and can operate 20W stereo or 40W mono optionally.
AD82586C can provide advanced audio processing capabilities, such as volume control, 20 bands speaker EQ, audio mixing, 3D surround and DRC (dynamic range control). These functions are fully programmable via a simple I2C control interface.
Robust protection circuits are provided to protect AD82586C from damage due to accidental erroneous operating condition. AD82586C is more tolerant to noise and PVT (Process, Voltage, and Temperature) variation than the analog Class-AB or Class-D audio amplifier counterpart implemented by analog circuit design. AD82586C is pop free during instantaneous power switch because of its built-in, robust anti-pop circuit.

• 16/18/20/24-bits input with I2S, Left-alignment and Right-alignment data format.
• PSNR & DR (A-weighting) Loudspeaker: 99dB (PSNR), 104dB (DR) @24V. Up
• Multiple sampling frequencies (Fs)
32kHz / 44.1kHz / 48kHz and
64kHz / 88.2kHz / 96kHz and
128kHz / 176.4kHz / 192kHz
• System clock = 64x, 128x, 192x, 256x, 384x, 512x, 576x, 768x, 1024x Fs
64x~1024x Fs for 32kHz / 44.1kHz / 48kHz
64x~512x Fs for 64kHz / 88.2kHz / 96kHz
64x~256x Fs for 128kHz / 176.4kHz / 192kHz
• Supply voltage
3.3V for digital circuit
10V~26V for loudspeaker driver
• Loudspeaker output power at 24V
10W x 2CH into 8 ohm @0.17% THD+N for stereo
20W x 2CH into 8 ohm @0.26% THD+N for stereo
• Sound processing including:
20 bands parametric speaker EQ
Volume control (+24dB~-103dB, 0.125dB/step)
Dynamic Range Control (DRC)
Dual band DRC
Power clipping
3D surround sound
Channel mixing
Noise gate with hysteresis window
Bass/Treble tone control
DC-blocking high-pass filter
• Anti-pop design
• Short circuit and over-temperature protection
• I2C control interface with selectable device address
• Support hardware and software reset
• Internal PLL
• LV Under-Voltage shutdown and HV Under-Voltage detection
• Power saving mode.

HEADPHONE AMPLIFIER (U5)

The AD22657B is a 2-Vrms cap-less stereo line driver. The device is ideal for single supply electronics.  Cap-less design can eliminate output dc-blocking capacitors for better low frequency response and save cost.
The AD22657B is capable of delivering 2-Vrms output into a 10k ohm load with 3.3V supply. The gain settings can be set by users from 1V/V to 10V/V externally. The AD22657B has under voltage protection to prevent POP noise. Build-in shutdown control and de-pop control sequence also help AD22657B to be a pop-less device. The AD22657B is available in a 10-pin MSOP package.

POWER STAGE
Power socket is used for taking voltages which are 12V_stby and 24V (VDD_Audio for 10W option via power_pin1). These voltages are produced in power card. Also socket is used for giving dimming, back-light and stand-by signals with power card.

C1 Module connector details and problems

The TPS54528 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54528 enables system designers to complete the suite of various end-equipment power bus regulators with a cost effective, low component count, low standby current solution. The main control loop for the TPS54528 uses the D-CAP2™ mode control that provides a fast transient response with no external compensation components. The adaptive on-time control supports seamless transition between PWM mode at higher load conditions and Eco-mode™ operation at light loads. Eco-mode™ allows the TPS54528 to maintain high efficiency during lighter load conditions. The TPS54528 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors.

The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 6.0 V. The device also features an adjustable soft start time. The TPS54528 is available in the 8-pin DDA package, and designed to operate from –40 C to 85 C.

The MP8774 is a fully integrated high-frequency, synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. The MP8874 offers a very compact solution that achieves 12A of continuous output current with excellent load and line regulation over a wide input range. The MP8774 uses synchronous mode operation for higher efficiency over the output current load range. Constant-on-time (COT) control operation provides very fast transient response, easy loop design, and very tight output regulation. Full protection features include short-circuit protection (SCP), over-current protection (OCP), under-voltage protection (UVP), and thermal shutdown. The MP8774 requires a minimal number of readily available, standard, external components and is available in a space-saving QFN-16 (3mmx3mm) package.

The APL5910 is a 1A ultra low dropout linear regulator. The IC needs two supply voltages, one is a control voltage (VCNTL) for the control circuitry, the other is a main supply voltage (VIN) for power conversion, to reduce power dissipation and provide extremely low dropout voltage. The APL5910 integrates many functions.
A Power-On- Reset (POR) circuit monitors both supply voltages on VCNTL and VIN pins to prevent erroneous operations. The functions of thermal shutdown and current-limit protect the device against thermal and current over-loads. A POK indicates that the output voltage status with a delay time set internally. It can control other converter for power sequence. The APL5910 can be enabled by other power systems. Pulling and holding the EN voltage below 0.4V shuts off the output.
The APL5910 is available in a SOP-8P package which features small size as SOP-8 and an Exposed Pad to reduce the junction-to-case resistance to extend power range of applications.

NOVATEK NT72671TBG MICROCONTROLLER

NT72671TBG is an integrated digital TV system-on-chip which complaints with variety ATV standards (NTSC, PAL and SECAM), and DTV standards (ISDB-T, DVB-T/-T2/-C/-S/-S2/-S2X, ITU-TJ.83B, 8VSB, and DTMB), and integrates DTV and multi-media AV decoder, SIF demodulator, and support A/V post-processing. The integrated video ADC and video decoder support PC VGA port, YPbPr or SCART, CVBS and SCART S-Video Input. The video decoder supports universal TV video format. The integrated audio ADC
supports stereo audio input corresponding to video input sources. The integrated TV sound decoder supports universal TV sound format. The advanced picture quality and color engine create more vivid image impression than ever. The HDMI receiver v2.0 supports deep color, CEC features and 3D input formats. The USB high speed host supports updating firmware code, multi-media playback from the external USB flash devices.
The standby controller can operate solely from the main system, powered by the standby power-source from power module, consumes as low current as possible. It meets the requirement of Green appliance.

VESTEL 17MB82 LCD TV CHASSIS, HOW TO ENTER THE SERVICE MODE, FULL SCHEMATIC AND OTHER DETAILS

Used with Telefunken, Sharp, Vestel and many other models LCD TVs

17MB82S main board is driven by MediaTek MT5820. This IC is capable of handling Video and audio processing, Scaling-Display processing, 3D comb filter, OSD and text processing, LVDS/mini-LVDS transmitting, channel and MPEG2/4 decoding, integrated DVB-T/C demodulator and media center functionality.
TV supports PAL, SECAM, NTSC color standards and multiple transmission standards as B/G, D/K, I/I’, and L/L’ including German and NICAM stereo. Also DVB T, DVB-C are supported internal demodulators of MediaTek IC and DVB-S/S2 is supported with external demodulator.
Sound system output is supplying max. 2x8W ( less 10%THD at max output) for stereo 8Ω speakers.

MxL601 is a highly integrated low-power silicon tuner IC targeting all global analog and digital cable standards as well as digital terrestrial reception standards. Broadband input filtering and channel filtering have been completely integrated on-chip. This integration enables a very compact design requiring a small footprint, low bill-of-materials cost, and low power consumption. A signal at the 753 RF input is filtered and converted to a programmable IF output up to 44MHz. Automatic gain control, LO generation, and channel selectivity functions are completely integrated on the chip, which simplifies boardlevel design. All functions of the IC can be controlled via I2C interface. MxL601 is available in a 4 x 4 mm2 24-pin QFN package.

The TAS5721 is a 15-W stereo or 2x10 W + 1x15 W2.1 device, efficient, digital audio-power amplifier for driving stereo bridge-tied speakers. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital audio processors and MPEG decoders. The device accepts a wide range of input data and data rates. Awfully programmable data path routes these channels to the internal speaker drivers. The TAS5721 is a slave-only device receiving all clocks from external sources. The TAS5721 operates with a PWM carrier between a 384-kHz switching rate and a 352-KHz switching rate, depending on the input sample rate. Oversampling combined with a fourth- order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

The DC voltages required at various parts of the chassis and panel is provided by a main power supply unit. MB82S chassis can operate with PW05, IPS60, IPS70, IPS16, IPS17, IPS19, PW25, PW26, PW82-3, PW03, PW04, PW06, PW07 as main power supply and also with 12V adaptor.

Which power board can be used for board to board or cable connection?
Board to board (BTB) : PW05, IPS60, IPS70, IPS16, IPS17, IPS19
Power Cable : PW25, PW26, PW82-3, PW03, PW04, PW06, PW07
The power supplies generate 24V, 12V, 5V, 3,3V and 12V, 5V, 3.3V standby mode DC voltages. Power stage which is on-chassis generates 5V, 3V3 stand by voltage and 12V, 8V, 5V, 3V3, 2.5V, 1,8V and 1,2V supplies for other different parts of the chassis. The blocks on power block diagram is using dependent to main supply. For PW26 and PW27 just common blocks are enough for proper operation.
Short CCT Protection Circuit
Short circuit protection is necessary for protecting chassis and main IC against damages when any Vcc supply shorts to ground. Protect pin should be logic high while normal operation. When there is a short circuit protect pin should be logic low. After any short detection, SW forces LEDs on LED card to blink.

MT5820 (Main IC) (U1)
The MediaTek MT5820 family consists of a backend decoder and a TV controller and offers high integration for advanced applications. It combines a transport de-multiplexer, a high definition video decoder, an audio decoder, a dual-link LVDS transmitter, a mini-LVDS transmitter, an EPI transmitter and an NTSC/PAL/SECAM TV decoder with a 3D comb filter (NTSC/PAL). The MT5820 enables consumer electronics manufactures to build high quality, low cost and feature-rich DTV.
World-Leading Audio/Video Technology: The MT5820 supports Full-HD MPEG1/2/4/h.264/DiviX/VC1/RM/AVS/VP6/VP8 (option) video decoder standards, and JPEG. The MT5820 also supports MediaTek MDDiTM de-interlace solution can reach very smooth picture quality for motions. A 3D comb filter added to the TV decoder recovers great details for still pictures. The special color processing technology provides natural, deep colors and true studio quality video. Also, the MT5820 family has built-in high resolution and high-quality audio codec.
Rich Features for High Value Products: The MT5820 family enables true single-chip experience. It integrates high-quality HDMI1.4a, high speed VGA ADC, LVDS, mini-LVDS, EPI, USB2.0 receiver, TCON (option), panel overdrive (option).
WW Common Platform Capability: Reserved transport stream input is for external demodulator for other countries or areas. TV maker can easily port the same UI to worldwide TV models. Excellent adjacent and co-channel rejection capability grants customers never miss any wonderful stream. Professional error-concealment provides stable, smooth and mosaic-free video quality.

DDR3 SDRAM 1Gb G-die

The 1Gb DDR3 SDRAM G-die is organized as a 8Mbit x 16 I/Os x 8banks device. This synchronous device achieves high speed double-data-rate transfer rates of up to
2133Mb/sec/pin(DDR3-2133)for general applications. The chip is designed to comply with the following key DDR3 SDRAM features such as posted CAS, Programmable CWL, Internal (Self) Calibration, On Die Termination using ODT pin and Asynchronous Reset . All of the control and address inputs are synchronized with a pair of externally supplied differential clocks. Inputs are latched at the cross point of differential clocks (CK rising and CK falling). All I/Os are synchronized with a pair of bidirectional strobes (DQS and DQS) in a source synchronous fashion. The address bus is used to convey row, column, and bank address information in a RAS/CAS multiplexing style. The DDR3 device operates with a single 1.5V ± 0.075V power supply and 1.5V ± 0.075V VDDQ. The 1Gb DDR3 G-die device
is available in 96ball FBGA(x16).

Features
• JEDEC standard 1.5V ± 0.075V Power Supply
• VDDQ = 1.5V ± 0.075V
• 533MHz fCK for 1066Mb/sec/pin, 667MHz fCK for 1333Mb/sec/pin, 800MHz fCK for 1600Mb/sec/pin, 933 MHz fCK for 1866Mb/sec/pin,
1066 MHz fCK for 2133Mb/sec/pin
• 8 Banks
• Programmable CAS Latency(posted CAS): 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
• Programmable Additive Latency: 0, CL-2 or CL-1 clock
• Programmable CAS Write Latency (CWL) = 6 (DDR3-1066),

7 (DDR3-1333), 8 (DDR3-1600), 9 (DDR3-1866), 10 (DDR3-2133)
• 8-bit pre-fetch
• Burst Length: 8 (Interleave without any limit, sequential with starting address “000” only), 4 with tCCD = 4 which does not allow seamless read or write [either On the fly using A12 or MRS]
• Bi-directional Differential Data-Strobe
• Internal(self) calibration : Internal self calibration through ZQ pin (RZQ : 240 ohm ± 1%)
• On Die Termination using ODT pin
• Average Refresh Period 7.8us at lower than TCASE 85°C, 3.9us at 85°C < TCASE < 95 °C
• Asynchronous Reset
• Package : 96 balls FBGA - x16
• All of Lead-Free products are compliant for RoHS
• All of products are Halogen-free.

EN25Q64 64 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

The EN25Q64 is a 64 Megabit (8192K-byte) Serial Flash memory, with advanced write protection mechanisms. The EN25Q64 supports the standard Serial Peripheral Interface (SPI), and a high performance Dual output as well as Quad I/O using SPI pins: Serial Clock, Chip Select, Serial DQ0(DI), DQ1(DO), DQ2(WP) and DQ3(NC). SPI clock frequencies of up to 50MHz are supported allowing equivalent clock rates of 100MHz for Dual Output and 200MHz for Quad Output when using the Dual/Quad Output Fast Read instructions. The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction. The EN25Q64 is designed to allow either single Sector/Block at a time or full chip erase operation. The EN25Q64 can be configured to protect part of the memory as the software protected mode. The device can sustain a minimum of 100K program/erase cycles on each sector or block.

EN25QH16 16 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

The EN25QH16 is a 16 Megabit (2,048 K-byte) Serial Flash memory, with enhanced write protection mechanisms. The EN25QH16 supports the standard Serial Peripheral Interface (SPI), and a high performance Dual/Quad output as well as Dual/Quad I/O using SPI pins: Serial Clock, Chip Select, Serial DQ0(DI), DQ1(DO), DQ2(WP) and DQ3(HOLD). SPI clock frequencies of up to 80MHz are supported allowing equivalent clock rates of 160MHz (80MHz x 2) for Dual Output and 320MHz (80MHz x 4) for Quad Output when using the Dual/Quad I/O Fast Read instructions. The memory can be programmed 1 to 256 bytes at a time, using the Page Program instruction. The EN25QH16 is designed to allow either single Sector/Block at a time or full chip erase operation. The EN25QH16 can be configured to protect part of the memory as the software protected mode. The device can sustain a minimum of 100K program/erase cycles on each sector or block.

I-LM1117/LM 800mA Low-Dropout Linear Regulator
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It has the same pin-out as National Semiconductor’s industry standard LM317.
The LM1117 is available in an adjustable version, which can set the output voltage from 1.25V to 13.8V with only two external resistors. In addition, it is also available in five fixed voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V. The LM1117 offers current limiting and thermal shutdown. Its circuit includes a zener trimmed bandgap reference to assure output voltage accuracy to within ±1%. The LM1117 series is available in SOT-223, TO-220, and TO-252 D-PAK packages. A minimum of 10μF tantalum capacitor is required at the output to improve the transient response and stability.

Service menu

In order to enter the service menu, First Press “MENU” Then press the remote control code two times, which is “4725”.

USB operations option cannot be used directly. It can be used for updating panel tool, hw configuration etc.

Software update

In MB82 project there is only one software. From following steps software update procedure can be seen:
1. MB82.bin directly inside of a flash memory(not in a folder).
2. Put flash memory to the tv when tv is powered off.
3. Power on the and pre OK button on the remote control when the TV is opened.
4. If First Time Installition screen comes, it means software update procedure is successful.

Schematic

No Backlight Problem
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.
Possible causes: Backlight pin, dimming pin, backlight supply, standby off pin Backlight pin should be high in open position. If it is low, please check Q30 and panel cables.

Dimming pin should be high or square wave in open position. If it is low, please check S16 for Mstar side and panel or power cables, connectors.

Backlight power supply should be in panel specs.  check CN4 for MB82, related connectors for power supply cards.

STBY_ON/OFF should be low for standby on condition, check R2090.

CI Module Problem
Problem: CI is not working when CI module inserted.
Possible causes: Supply, supply control pin, detect pins, mechanical positions of pins CI supply shoul be 5V when CI module inserted. If it is not 5V  check CI_POWER_CTRL, this pin should be low.

Check mechanical positions of CI module.
Detect ports should be low. If it is not low please check CI connector pins, CI module pins and 3V3_VCC on MB82.

Led Blinking Problem
Problem: LED blinking, no other operation
This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal operation. When there is a short circuit protect pin will be logic low. If you detect logic low on protect pin, unplug the TV set and control voltage points with a multimeter to find the shorted voltage to ground.

IR Problem
Problem: LED or IR not working
Check LED card supply on MB82 chassis.

No Sound Problem
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC or 12V_VCC with a voltage-meter.
There may be a problem in headphone connector or headphone detect circuit (when headphone is connected, speakers are automatically muted). Measure voltage at
HP_DETECT pin, it should be 3.3v.

Standby On/Off Problem
Problem:
Device cannot boot, TV hangs in standby mode.
There may be a problem about power supply. Check 12V_VCC, 5V_VCC and 3V3_VCC with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW. Additionally it is good to check SW printouts via hyper-terminal (or Teraterm). These printouts may give a clue about the problem.

No Signal Problem
Problem: No signal in TV mode.
Check tuner supply voltage; 3V3_TUN. Check tuner options are correctly set in Service menu. Check AGC voltage at IF_AGC pin of tuner