How to enter the service mode of Vestel 17MB211 main board, trouble shooting, descriptions about IC functions
Used in JVC LT32C690, Luxor Lux143005, Logik L32SHE1 and many other models
17MB211 main board is driven by Novatek SOC. This IC is a single chip iDTV solution which complaints with variety ATV as NTSC, PAL and SECAM, and DTV standards as ISDB-T, DVB-T/-T2/-C/-S/-S2, ITU-T J.83B, ATSC, integrates DTV and multi-media AV decoder, SIF demodulator, and support A/V post processing.
Key features include:
ATSC,DVB-T,T2,DVB-C, DVB-S/S2 demodulators
• A multi standard A/V format decoder
• Advanced Super Resolution 5th generation Advanced Scaling Up Engine
• Embedded dual 10 bit LVDS transmitter
• Dedicated DSP to decode compressed audio
• 4K2K 30p HDMI input with scaling down
• Rich internet connectivity and completed digital home network solution
• Mılti-purpose CPU for OS and multimedia
• Peripheral and power management
• Embedded DRAM.
Supported peripherals are:
1 RF input VHF I, VHF III, UHF
• 1 Satellite input
• 1 Side AV (CVBS, R/L-Audio)
• 1 BAV-IN socket(Common)
• 1 PC input(Common)
• 3 HDMI input
• 1 Common interface(Common)
• 1 Optic/ Quax S/PDIF output
• 1 Headphone(Common)
• 2 USB(1x common, 1x optional) and 2x internal USB for Wifi/Bluetooth
• 1 Ethernet-RJ45
• 1 External Touchpad/ Keyboard/Magic Button
• 1 DVD(Optional)
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 completely 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.
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.
AUDIO AMPLIFIER STAGES: MAIN AMPLIFIER (U62)(6-8-10 W OPTİON)
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.
Features:
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
256x1024x Fs for 32kHz / 44.1kHz / 48kHz
128x512x Fs for 64kHz / 88.2kHz / 96kHz
64x256x 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 ohms 0.16% THD+N
15W x 2ch into 8 ohms 0.18% THD+N
20W x 2ch into 8 ohms 0.24% THD+N
Loudspeaker output power for Mono 24V
20W x 1ch into 4 ohms 0.17% THD+N
30W x 1ch into 4 ohms 0.2% THD+N
40W x 1ch into 4 ohms 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.
MAIN AMPLIFIER (U91)(2.5 W OPTION)
The AD52010 is a 3.0W stereo, filter-less class-D audio amplifier. Operating with 5.0V loudspeaker driver supply, it can deliver 3.0W output power into 4 ohm loudspeaker within 10% THD+N or 2.6W at 1% THD+N. The AD52010 is a stereo audio amplifier with high efficiency and suitable for the notebook computer, and portable multimedia device.
Supply voltage range: 2.5 V to 5.5 V
Support single-ended or differential analog input
Low Quiescent Current
Low Output Noise
Low shut-down current
Short power-on transient time
Internal pull-low resistor on shut-down pins
Short-circuit protection
Over-temperature protection
Loudspeaker power within 10% THD+N
1.78W/ch into 8 ohm loudspeaker
3W/ch into 4 ohm loudspeaker
Loudspeaker efficiency
93% 8 ohm, THD+N=10%
85% 4 ohm, THD+N=10%
E-TSSOP-14L package
Integrated Feedback Resistor of 300kW.
HEADPHONE AMPLIFIER (U85)
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, backlight and stand-by signals with power card. It is shown in figure:
List of the components are:
SW1(Q61) → FDC642P
SW2(Q77) → DMG6402LDM
DC-DC1(U2) → TPS54528
DC-DC2 (U128) → TPS562201
DC-DC3 (U129) → RT6213BHGJ6F
DC-DC4 (U63) → RT7278G (12V panel option)
DC-DC4 (U63) → TPS54528 (5V panel option)
LDO1(U131) → AP2111H
LDO2(U143) → APL5910
TPS54528
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.
TPS562201
The TPS562201 is simple, easy-touse, 2-A synchronous step-down converter in SOT- 23 package. The devices are optimized to operate with minimum external component counts and also optimized to achieve low standby current. These switch mode power supply (SMPS) devices employ D-CAP2 mode control providing a fast transient response and supporting both low equivalent series resistance (ESR) output capacitors such as specialty polymer and ultra-low ESR ceramic capacitors with no external compensation components. The TPS562201 operates in pulse skip mode, which maintains high efficiency during light load operation. The TPS562201 and TPS562208 are available in a 6- pin 1.6 × 2.9 (mm) SOT (DDC) package and specified from – 40°C to 125°C of junction temperature.
RT7278
The RT7278 is a synchronous step down converter with Advanced Constant On-Time (ACOTTM) mode control. The ACOTTM provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.5V to 17V. The proprietary circuit of the RT7278 enables to support all ceramic capacitors. The output voltage can be adjustable between 0.8V and 8V. The soft-start is adjustable by an external capacitor.
RT6213
The RT6213A/B is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A peak output current from a 4.5V to 18V input supply. The RT6213A/B adopts ACOT architecture to allow the transient response to be improved and keep in onstant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection, output over current protection, and thermal shutdown.
LM1117
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.
APL5910
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.
MICROCONTROLLER: NOVATEK NT72563MBG-GA
The NT72563MBGis an integrated digital TV system-on-chip which compliants with variety ATV as NTSC, PAL and SECAM, and DTV standards as ISDB-T, DVB-T/-T2/-C/-S/-S2, ITU-T J.83B, ATSC, 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, BAV-IN, CVBS and S-Video Input. Regarding the tuner input, the digital VIF performs the universal analog TV demodulation (NTSC, PAL, and SECAM), including IF processing, AGC, video demodulation, and second sound IF generation (SSIF).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 v1.4b, supports deep color, CEC features and 3D formats. The USB high speed host supports updating firmware code, multi-media playback from the external USB flash devices. The standby controller can operate sololy 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.
4GB DDR3 SDRAM: HYNİX H5TQ4G63EFR-TEC 2133 (U72)
The H5TQ4G83EFR-xxC,H5TQ4G63EFR-xxC, H5TQ4G83EFR-xxI, H5TQ4G63EFR-xxI, H5TQ4G83EFR-xxL, H5TQ4G63EFR-xxL, H5TQ4G83EFR-xxJ and H5TQ4G63EFR-xxJ are a 4,294,967,296-bit CMOS Double Data Rate III (DDR3) Synchronous DRAM, ideally suited for the main memory applications which requires large memory density and high bandwidth. SK Hynix 4Gb DDR3 SDRAMs offer fully synchronous operations referenced to both rising and falling edges of the clock. While all addresses and control inputs are latched on the rising edges of the CK (falling edges of the CK), Data, Data strobes and Write data masks inputs are sampled on both rising and falling edges of it. The data paths are internally pipelined and 8-bit prefetched to achieve very high bandwidth.
4GBİT (256M X 8 BİT) NAND FLASH MEMORY: MT29F4G08ABAEAWP (U133)
Micron NAND Flash devices include an asynchronous data interface for high-performance I/O operations.
These devices use a highly multiplexed 8-bit bus (I/Ox) to transfer commands, address, and data. There are five control signals used to implement the asynchronous data interface: CE, CLE, ALE, WE, and RE. Additional signals control hardware write protection and monitor device status (R/B). This hardware interface creates a low pin-count device with a standard pin out that remains the same from one density to another, enabling future upgrades to higher densities with no board redesign. A target is the unit of memory accessed by a chip enable signal. A target contains one or more NAND Flash die. A NAND Flash die is the minimum unit that can independently execute commands and report status. A NAND Flash die, in the ONFI specification, is referred to as a logical unit (LUN). There is at least one NAND Flash die per chip enable signal. This device has an internal 4-bit ECC that can be enabled using the GET/SET features or by factory (always enabled).
16M-BIT [16M X 1] CMOS SERIAL FLASH EEPROM: KH25L1606EM2-12G MACRONİX SPI FLASH (U81)
The device features a serial peripheral interface and software protocol allowing operation on a simple 3-wire bus. The three bus signals are a clock input (SCLK), a serial data input (SI), and a serial data output (SO).
Serial access to the device is enabled by CS input. When it is in Dual Output read mode, the SI and SO pins become SIO0 and SIO1 pins for data output. The device provides sequential read operation on whole chip.
After program/erase command is issued, auto program/erase algorithms which program/erase and verify the specified page or sector/block locations will be executed. Program command is executed on byte basis, or page basis, or word basis for erase command is executes on sector, or block, or whole chip basis. To provide user with ease of interface, a status register is included to indicate the status of the chip. The status read command can be issued to detect completion status of a program or erase operation via WIP bit. Advanced security features enhance the protection and security functions; please see security features section for more details.
When the device is not in operation and CS is high, it is put in standby mode. The device utilizes Macronix's proprietary memory cell, which reliably stores memory contents even after typical 100,000 programs and erase cycles.
SOFTWARE UPDATE: MAIN SW UPDATE
1. shredder-usb-update.bin, shredder-usb-update.scr, shredder-usb-update.scr.core and upgrade_mb211.bin files should be copied directly inside of a flash memory (not in a folder).
2. Insert flash memory to the TV when TV is powered off.
3. While pushing the OK button in remote control, power on and wait. TV will power-up itself.
4. If First Time Installation screen comes, it means software update procedure is successful.
TROUBLESHOOTING: NO BACKLIGHT 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 (Panel-VCC), stby on/off pin BACKLIGHT-ON/OFF pin should be high when the backlight is ON. Collector pin of Q27 must be low when the backlight is OFF. If it is a problem, please check Q27 and the panel cables. Also it can be tested in TP87 in main board.
Dimming pin should be high or square wave in open position. If it is low, please check S248 for Novatek side and panel or power cables, connectors.
Backlight power supply (Panel_VCC) should be in panel specs. Please check Q43, shown below; also it can be checked TP65.
STBY-ON/OFF should be low for TV on condition, please check Q36’s collector.
CI MODULE PROBLEM: CI is not working when CI module inserted.
Possible causes: Supply, suply control pin, detects pins, mechanical positions of pins.
• CI supply should be 5V when CI module inserted. If it is not 5V please check CI-PWR-CTL, this pin should be low.
Please check mechanical position of CI module. Is it inserted properly or not?
• Detect ports should be low. If it is not low please check CI connector pins, CI module pins.
STAYING IN STAND-BY MODE: Staying in stand-by mode, 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: LED or IR not working
Check LED card supply on MB211 chassis.
KEYPAD TOUCHPAD PROBLEMS: Keypad or Touchpad is not working
Check keypad supply on MB211.
USB PROBLEMS: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V. Also USB Enable should be logic high.
NO SOUND PROBLEM: No audio at main TV speaker outputs.
Check supply voltages of 12V-VCC, VDD-AUDIO and 3V3-AMP 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: Device cannot boot, TV hangs in standby mode.
There may be a problem about power supply. Check main supplies 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 Teraterm. These printouts may give a clue about the problem. You can use VGA for terraterm connection.
NO SIGNAL PROBLEM: No signal in DVB-T/T2/C mode.
Check tuner supply voltage; 3V3-TUNER and VDD-1V8. Check tuner options are correctly set in Service menu. Check AGC voltage at TUNER-IF-AGC pin of tuner.
No signal or Low signal in DVB-S/S2 mode.
Check signal cables and LNB voltage, if there is no problem, check AV2018 supply voltage 3V3-VCC-SAT. If it is OK, then measure the voltage from the PIN1 of U142.
If the PIN1 voltage is equal to 0V, please check i2c waveforms and software. If the PIN1 voltage is lower than 1V (e.g: 0.8Vor 0.3V), change the U142 with a new part.
SERVICE MENU [Service Mode]
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.