PDI-P23LCD – PAL-SECAM-NTSC – 23 INCH TFT LCD TV – HOW TO ENTER THE SERVICE MODE, SCHEMATIC DIAGRAM, FUNCTIONAL DESCRIPTION

PDI-P23LCD – PAL-SECAM-NTSC – 23 inch TFT LCD TV – How to enter the service mode, schematic diagram, functional description

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil th separate from or “lift-off” the board.

The TFT LCD TV described in the followings is based on a Multi TV system, digital Control display, 23.01" diagonal. The TFT LCD TV is intended to be a finished product, basically a display device mounted inside an enclosure which will provide the safety Requirements. With the exception of LCD Panel, the display device shall be composed entirely of solid state components these components shall have a history of reliable service in identity applications and shall be applied in the circuits.
1. SCALER SECTION.
2. VCT 49xxi SECTION.
3. Video A/D Converter

How to enter, adjust and exit the service mode

When the EEPROM has been replaced, the SVC data should be restored as the function of individual system and specification.
When the EEPROM has been replaced White Balance Checking.
[ Enter and exit SVC mode ]
Note: into the SVC mode, Initialize with default data.
1) Press 5 Seconds MENU buttons on both TV set and Remote Controller at the same time to get into SVC mode.
2) Press the PR ▲▼ button several times to find SVC Data.
3) Input the corresponding SVC data referring to Table below with the VOL ◀▶ , key.
4) Press TV/AV button to exit SVC mode.

If the set is cold, there may be a small “flicker” when the set is switched on.  This is normal; there is nothing wrong with the set.

Some dot defects may appear on the screen, like Red,Green or Blue spots,  However, this will have no impact or effect on the monitor performance.

The resolution which is not supported will appear at the resolution which gets near to the resolution which is supported.

*The standard of the resolution which gets near : H/V sync.

Press the Q.VIEW button to switch the 640x480 60hz to 720x480P 60Hz

ADJUSTMENT INSTRUCTION WITH DEFAULT FACTORY DATA: White Balance Checking

Schematic  / [Circuit diagram]

Click on the pictures to magnify

SCALER SECTION
Device : MST6151
Features: Input supports up to UXGA & 1080P
Panel supports up to SXGA/WXGA
Integrated two-port triple-ADC/PLL
Integrated DVI/HDCP compliant receiver
YUV422 digital video input ports
Dual high-quality scaling engines
Built-in 3-D video de-interlacer
Video-over-graphic PIP
Video-by-graphic split screen
MStarACE advanced picture/color processing engine
Embedded On-screen Display Controller (OSD) engine
Built-in dual-link LVDS transmitter
5-Volt tolerant inputs
Low EMI and power saving features
Supports PWM & GPO controls
208-pin PQFP package
Analog RGB/YPbPr Input Ports
DVI/HDCP Compliant Input Port
Video Input Port
Auto-Configuration/Auto-Detection
Dual High-Performance Scaling Engines
Video Processing & Conversion
On-Screen OSD Controller
Description
The MST6151 is a high performance and fully integrated graphics processing IC solution for multi-function LCD monitor/TV with resolutions up to SXGA/WXGA. It is configured with an
integrated triple-ADC/PLL, an integrated DVI/HDCP receiver, a video de-interlacer, two high quality scaling engines, an on-screen display controller, and a built-in output clock generator. By use of external frame buffer, PIP is provided for multimedia applications. It supports de-interlaced full-screen video, video-on-graphic overlay, video-by-graphic split screen, frame rate conversion, and aspect ratio conversion for various video sources. To further reduce system costs, the MST6151 also integrates intelligent power management control capability for green-mode requirements and spread-spectrum support for EMI management.

VCT 49xxi SECTION
Device : VCT 49xxi
Features : PSSDIP88-1/-2 package
PMQFP144-2 package
Submicron CMOS technology
Low-power standby mode
Single 20.25-MHz reference crystal
8-bit 8051 instruction set compatible CPU
Up to 256 kB on-chip program ROM
WST, PDC, VPS, andWSS acquisition
Closed Caption and V-chip acquisition
Up to 10 pages on-chip teletext memory
Multi-standard QSS IF processing with single SAW
FM Radio and RDS with standard TV tuner
TV-sound demodulation:
Baseband sound processing for loudspeaker channel:
CVBS, S-VHS, YCrCb and RGB inputs
4H adaptive comb filter (PAL/NTSC)
multi-standard color decoder (PAL/NTSC/SECAM)
Nonlinear horizontal scaling “panorama vision”
Luma and chroma transient improvement (LTI, CTI)
Non-linear color space enhancement (NCE)
Dynamic black level expander (BLE)
Scan velocity modulation output
Soft start/stop of H-drive
Vertical angle and bow correction
Average and peak beam current limiter
Nonlinear and dynamic EHT compensation
Black switch off procedure (BSO)
Description
The VCT 49xxI is an IC family of high-quality single chip TV processors. Modular design and deep-submicron technology allow the economic integration of features in all classes of single scan TV sets. The VCT 49xxI family is based on functional blocks contained and approved in existing products like DRX 396xA, MSP 34x5G, VSP 94x7B, DDP 3315C and SDA 55xx.
Each member of the family contains the entire IF, audio, video, display, and deflection processing for 4:3 and 16:9 50/60-Hz mono and stereo TV sets. The integrated micro-controller is supported by a powerful OSD generator with integrated Teletext & CC acquisition including on-chip page memory.

control
*Integrated clamp with timing generator
*Integrated Brightness & Contrast controls
*Integrated precision voltage reference
*Compatible with VGA through SXGA RGB graphics signals, and component TV, DTV and HDTV
*Pin Compatible with AD9883A
*Serial port programming interface
*Mid-Scale Clamping
*Fully Sync Processing
*4:2:2 and 4:4:4 Output Format Mode
*Color space conversion (RGB to YCbCr)
*Internal pattern generator*
*Sawtooth vertical deflection signals for VSYNC input*
*BT656 output format mode*
*Black and mid-level precision clamp and calibration*
*Please see MST9883C Application Note for details.RGB Graphics
Processing
(A/D Converter):   Description
Most flat-panel monitors and projectors require a digital graphics input in order to accurately scale and display graphics. The huge installed base of computers with analog video graphics interfaces necessitates the use of a graphics digitizer to re-digitize the analog RGB signal before further processing.
 The MST9883CR is a fully integrated analog interface for digitizing high-resolution RGB graphics signals from PC’s and workstations. With a sampling rate capability of up to 140 MHz, it can accurately support display resolutions up to 1280x1024 (SXGA) at 75 Hz. The clamped input circuits provide sufficient band width to accurately digitize each pixel.
 The MST9883CR provides a high performance highly integrated solution to support the digitization process, including the ADC’s, a voltage reference, a PLL to generate the pixel sampling clock from HSYNC, clamping circuits, and programmable offset and gain circuits to provide brightness and contrast controls.
 When the COAST signal is asserted, the PLL will maintain its output frequency when HSYNC pulses are absent, such as during the VSYNC period in some systems.
 A 32-step programmable phase adjustment control (0-360 deg) is provided for the pixel sampling clock to adjust for the difference between the HSYNC edge and RGB pixel edge timing.
 The MST9883CR can send output data through one 24-bit port at the pixel clock rate.
 The MST9883CR can also support RGB to YCbCr conversion.
 The MST9883CR has internal programmable pattern generator for testing.
 The MST9883CR can accept either standard TTL, CMOS levels or saw tooth vertical deflection signals for VSYNC input.

Device: Features - MST9883CR

*Triple ADC with 12 - 140 MHz Sampling Rate
*Integrated line locked PLL generates pixel clock from HSYNC
*Integrated 5-bit pixel clock phase adjustment for precise sample timing.