ELECTRONIC EQUIPMENT REPAIR CENTRE : EMERSON EWL20S5 SEREVCIE MODE AND POWER SUPPLY CIRCUIT

SEREVCIE MODE AND POWER SUPPLY CIRCUIT

Category : Lcd Television Repair

SERVICE MODE

1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV unit.)
3. Press [SLEEP] button on the service remote control unit. Version of micro computer will be displayed on the LCD or display. (Ex: 0008GP- 0.08)

Initial Setting

General: Enter the Service mode

Set the each initial data as shown on table below

Initial Data
Item	Button (on the service remote control)	Data Value
BRT	[MENU]à[1]		128
CNT			124
CLR-R			64
CLR-B			64
TNT			128
V-TNT			128
SHR			112
S-BRT	[MENU]à [2]		128
S-CNT			128
S-CLR-R			64
S-CLR-B			64
S-TNT			128
S-SHR			112
C-BRT	[MENU]à[3]		128
C-CNT			128
C-CLR-R			64
C-CLR-B			64
C-TNT			128
C-SHR			112
D2-BRT	[MENU]à[5]		133
D2-CNT			140
D2-CLR-R			74
D2-CLR-B			74
D2-TNT			128
D2-SHR			112
D3-BRT	[MENU]à[6]		126
D3-CNT			138
D3-CLR-R			64
D3-CLR-B			64
D3-TNT			128
D3-SHR			112
DR(C/D1)	[VOL V ]à [4]		176
C-DR(C/D2)	[VOL V ]à [4]		157
DB(C/D1)	[VOL V ]à[6]		175
C-DB(C/D2)	[VOL V ]à[6]		152

Flicker Adjustment

1. Enter the Service mode.

2. Press [2] button on the remote control unit.
3. If Flicker Adjustment is not fit,.

4. Press [CH UP/ DOWN] buttons on the remote control unit so that flash stops.

White Balance Adjustment

Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish

Note: Use service remote control unit
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 20%).
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. [RF/VIDEO1]
Enter the Service mode. Press “VOL DOWN” button on the remote control unit and select “C/D-1” mode.
[VIDEO2]
Enter the Service mode. Press “VOL DOWM” button on the remote control unit and select “C/D-2” mode.

5. [RF/VIDEO1]
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 ±0.01.
[VIDEO2]
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 ±0.01.
6. Turn the power off and on again. (Main power button on the TV unit.)

How to initialize the LCD television:

1. Turn the power on. (Use main power on the TV unit.)
2. To enter the service mode, press [SLEEP] 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 the screen.

POWER SUPPLY CIRCUIT
Power supply board