Thursday, January 14, 2016

FUNAI LT850-M22 - LT851-M22 – Service mode – White balance adjustment – Factory initialization – LCD Television repair and Service

Category: LCD Television repair and service 

Contents of this article 

  • How to access to service mode
  • VCOM Adjustment
  • Factory initialization  




FUNAI LT850-M22 - LT851-M22

How to set up the service mode
1. Turn the power on.
2. Press [MENU] button to display Setup menu.
3. Select “Software” in “OTHERS” and press [OK] button.
4. Press [0], [4], [2], [5], [7], [4] and [ i ] buttons on the remote control unit in this order. The following screen appears.
Purity Check Mode
This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the remote control unit, the display changes
3. To cancel or to exit from the Purity Check Mode, press [BACK] button.
VCOM Adjustment
1. Operate the unit for more than 20 minutes.
2. Set the color analyzer and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as shown above.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
3. Enter the Service mode.
4. To enter the “VCOM-2 adjustment mode”, press [3] button on the remote control unit.
To enter the “VCOM-1 adjustment mode”, press [2] button on the remote control unit.
5. Press [P UP / DOWN ] buttons on the remote control unit so that the color analyzer value becomes minimum.
6. To cancel or to exit from the VCOM Adjustment, press [BACK] button.
White Balance Adjustment
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Raster(70%=70IRE, 40%=40IRE).
3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [ V -] button on the remote control unit and select “C/D” mode.
5. [CUTOFF]
Press [1] button to select “COR” for Red Cutoff adjustment. Press [3] button to select “COB” for Blue Cutoff adjustment.
[DRIVE]
Press [4] button to select “DR” for Red Drive adjustment. Press [6] button to select “DB” for Blue Drive adjustment.
6. In each color mode, press [P UP / DOWN ] buttons to adjust the values of color.
7. Adjust Cutoff and Drive so that the color temperature becomes 9200°K (x= 0.286 / y= 0.295 ±0.005).
8. To cancel or to exit from the White Balance Adjustment, press [BACK] button
How to initialize the LCD television
1. Turn the power on.
2. Enter the service mode.
- To cancel the service mode, press [ POWER ] button on the remote control unit.
3. Press [ i ] button on the remote control unit to initialize the LCD television.
4. "INITIALIZED" will appear in the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is complete