Wednesday, January 13, 2016

FUNAI LH850-M32 - Service mode - How to initialize the TV settings - VCOM adjustment - white balance adjustment - Firmware updating procedure - Power supply Board circuit – Back light Inverter Board circuit - LDC Television Repair and service

Category: LCD Television Repair And Service 

Contents of this article 

  • How to Access to service mode
  • How to initialize the Television
  • Firmware update Procedure
  • Power supply  Schematic diagram 
  • Back Light Inverter Schematic digram 

FUNAI LH850-M32

Service mode
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 [ ] 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 [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.
The White Balance Adjustment should be performed when replacing the LCD Panel or Digital Main CBA.
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 as shown above.
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.
INITIALIZE THE LCD TELEVISION
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.
Firmware Update Procedure
Check the current version
1. Press [MENU] button on the remote control unit to display the menu mode.
2. Press [UP] or [DOWN] to select “OTHERS”, then press [OK] button.
3. Press [UP] or [DOWN] to select “Software”, then press [OK] button.
The current FW version will be displayed.
Preparation
1. Prepare USB storage device.
2. Copy F/W-file (ecc file) to USB storage device.
Note: Make sure to use the blank USB Storage.
3. Rename the F/W-file’s name.
Step1. Add the “_F” at the end of the name.
(If the file name in USB says “ZF6731915NOS-030-05.ecc”, the new file name should be “ZF6731915NOS-030-05_F.ecc”.)
Step2. The 6th and 7th digit of the file name indicate the size of TV. If the size of your TV and the file name were not the same, you must change the file name.
Update procedure
1. Plug in the AC power cord.
2. Press [ ] button on the remote control unit to turn off (standby).
3. Check “STAND BY” indicator (Red LED) lighting.
4. Insert USB storage device with F/W to TV set.
5. Press [ ] button to turn on.
6. After approximately 70 seconds, the following will appear on the screen and the update begins automatically.
Note: Do not turn off the TV set and do not remove the USB storage device while this procedure. The update will be completed in about 2 minutes.
7. Press [POWER ] button to turn off (standby).
8. Check “STAND BY” indicator (Red LED) lighting.
9. Remove USB storage device from TV set.
10. Press [POWER ] button to turn on.
POWER SUPPLY CIRCUIT 
BACK LIGHT INVERTER CIRCUIT 
CLICK ON THE IMAGES TO ZOOM IN