Thursday, November 05, 2015

EMERSON LCD TV EWL20D6 SERVICE MODE INITIALIZATION POWER SUPPLY CIRCUIT AND BACK LIGHT INVERTER CIRCUIT

EMERSON EWL20D6 


SERVICE MODE INITIALIZATION POWER SUPPLY CIRCUIT AND BACK LIGHT INVERTER CIRCUIT  

Category : Television repair 

How to make Service remote control unit
1. Prepare normal remote control unit (Part No. NE240UD). Remove 3 screws from the back lid
2. Cut off pin 10 of the remote control microprocessor and short circuit pins 10 and 17 of the microprocessor with a jumper wire.

How to set up the service mode:
1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV unit.)
3. Press [DISC MENU] button on the service remote control unit. Version of micro computer will be displayed on the LCD or display.
Flicker Adjustment
1. Enter the Service mode.
2. Press [2] button on the remote control unit. The following screen appears.
Pic2
3. If Flicker Adjustment is not fit, the screen becomes the following
pic3
4. Press [CH. UP / DOWN] buttons on the remote control unit so that flash stops.
White Balance Adjustment 1
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish.
Note: Use the remote control unit.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80%).
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. [VIDEO1]
Enter the Service mode. Press “VOL DOWN” button on the remote control unit and select “C/D1-” mode.
[VIDEO2]
Enter the Service mode. Press “VOL DOWN” button on the remote control unit and select “C/D2-” mode.
5. [VIDEO1]
Press “6” button to select “DB(C/D1)” for Blue adjustment. Press “4” button to select “DR(C/D1)” for Red adjustment. When “x” value and “y” value are not within specification, adjust “DB (C/D1)” or “DR (C/D1)”. Refer to “1. Initial Setting.”
Note: “DB(C/D1)” or “DR(C/D1)” must be adjusted within ±0.005.
[VIDEO2]
Press “6” button to select “DB(C/D2)” for Blue adjustment. Press “4” button to select “DR(C/D2)” for Red adjustment.When “x” value and “y” value are not within specification, adjust “DB(C/D2)” or “DR(C/D2)”. Refer to “1. Initial Setting.”
Note: “DB(C/D2)” or “DR(C/D2)” must be adjusted within ±0.005.
6. Turn the power off and on again. (Main power button on the TV unit.)
White Balance Adjustment 2
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
4. [VIDEO1]
Enter the Service mode. Press “VOL DOWN” button on the remote control unit and select “C/D1-” mode.
[VIDEO2]
Enter the Service mode. Press “VOL DOWN” button on the remote control unit and select “C/D2-” mode.
5. [VIDEO1]
Press “3” button to select “COB(C/D1)” for Blue adjustment. Press “1” button to select “COR(C/ D1)” for Red adjustment. When “x” value and “y” value are not within specification, adjust “COB (C/ D1)” or “COR (C/D1)”. Refer to “1. Initial Setting.”
Note: “COB(C/D1)” or “COR(C/D1)” must be adjusted within ±0.005.
[VIDEO2]
Press “3” button to select “COB(C/D2)” for Blue adjustment. Press “1” button to select “COR(C/ D2)” for Red adjustment. When “x” value and “y” value are not within specification, adjust “COB(C/ D2)” or “COR(C/D2)”. Refer to “1. Initial Setting.”
Note: “COB(C/D2)” or “COR(C/D2)” must be adjusted within ±0.005.
6. Turn the power off and on again. (Main power button on the TV unit.
HOW TO INITIALIZE
DVD Section
1. Press [1], [2], [3], [4], and [DISPLAY] buttons on the remote control unit in that order.
2. Press [CLEAR] button on the remote control unit.
When “OK” appears on the screen, the factory default will be set.
3. To exit this mode, press [CH. UP / DOWN] or [SELECT] button to go to TV mode, or press [POWER] button to turn the power off.
LCD TV Section
1. Turn the power on. (Use main power on the TV unit.)
2. To enter the service mode, press [DISC MENU] button on the service remote control unit.
- To cancel the service mode, press [POWER] button on the remote control.
3. To initialize the LCD television, press [DISPLAY] button on the remote control unit.
4. Confirm "FF" indication on the upper right of th screen.
5. Unplug the AC cord
FIRMWARE RENEWAL
1. Turn the power on and press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode. Then remove the disc.
2. To put the LCD TV/DVD into F/W version up mode, press [9], [8], [7], [6], and [SEARCH MODE] buttons on the remote control unit in that order.
3. Insert the disc for version up into the disc slot.
4. The LCD TV/DVD enters the F/W version up mode automatically. Fig. c appears on the screen. If you enter the F/W for different models, “Disc Error” will appear on the screen, then the disc will be ejected automatically.
5. After programming is finished, the disc will be ejected automatically.
6. Remove the disc.
7. Press [CH. UP / DOWN ] button on the unit to go to TV mode, or press [POWER] button on the unit to turn the power off.
8. Press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode again.
9. Press [1], [2], [3], [4], and [DISPLAY] buttons on the remote control unit in that order.
10.Press [CLEAR] button on the remote control unit.
When “OK” appears on the screen, the factory default will be set. Then the firmware renewal mode is complete.
11.To exit this mode, press [CH. UP / DOWN] or [SELECT] button to go to TV mode, or press [POWER] button to turn the power off.
POWER SUPPLY CIRCUIT BOARD

BACK LIGHT INVERTER CIRCUIT BOARD
CLICK ON THE IMAGE TO ZOOM IN