SONY KDL-22EX420 - KDL-22EX423 -KDL-26EX420 - KDL-26EX423 – SERVICE MODE – SELF DIAGNOSTICS – LED BLINKING CODE – VCOM ADJUSTMENT – WHITE BALANCE ADJUSTMENT – LED TELEVISION REPAIR AND SERVICE

SONY KDL-22EX420 - KDL-22EX423 -KDL-26EX420 - KDL-26EX423 – Service mode – Self diagnostics – LED blinking code – VCOM Adjustment – White balance Adjustment – LED Television Repair and service

Category: LED Television Repair and Service 

Contents of this article 

• How to enter to service modes 
• LED Blinking code and problems 
• White balance adjustments 
• VCOM adjustments 

SONY KDL-22EX420 - KDL-22EX423 -KDL-26EX420 - KDL-26EX423

SERVICE ADJUSTMENT

Accessing Service Mode

While LCD TV set is on standby mode, press the following sequence on the Remote Commander key. < Display>  <5> <Vol Up>  <Power>

2. Digital Service Mode will be appeared first whenever entering Service Mode.
3. To changed the module, please press either OPTION or JUMP key on the remote commander.

Transition of each module in service mode
1. There are 3 modules in Service Mode:
Service Mode 1

a) Chassis
b) VPC

Service Mode 2
c) Digital
Change data by Service Mode 1 

1. To change category, item and data in CHASSIS or VPC service mode:
a. Press key 2 or 5 on remote commander to select (up or down) category.
b. Press key 1 or 4 on remote commander to select (up or down) Item.
c. Press key 3 or 6 on remote commander to change(up or down) data.
Remote commander key : 1, 2, 3 is for increment
Remote commander key : 4, 5, 6 is for decrement

2. To save changed data in Service Mode 1
a. Press key Mute on remote commander. It shows green SERVICE changes to green WRITE.
b. Press key 0. Green WRITE changes to red WRITE. It indicate writing is processing.
c. After a while, red WRITE changes to green SERVICE. Writing process is done at this point.
3. TV reboot is necessary for applying data change.

Change data by Service Mode 2 
Change data for all Except 003 DIG_SRV_MODE

To change category, item and data in DIGITAL service mode (except 003 DIG_SRV_MODE category):
a. Press key 2 or 5 on remote commander to select (up or down) category.
b. Press key 1 or 4 on remote commander to select (up or down) Item.
c. Press key 3 or 6 to change (up or down) data.
Remote commander key : 1, 2, 3 is for increment
Remote commander key : 4, 5, 6 is for decrement
No need to save for Digital Service Mode (except for 002 MODEL & 005 CHPRESET category)
Change data for 003 DIG_SRV_MODE
To change item and data in DIGITAL service mode (003 DIG_SRV_MODE category):
Please note because this operation is special.
a. Press key 2 or 5 on remote commander to select 003 DIG_SRV_MODE.
b. Press key 1 or 4 on remote commander to select (up or down) Item.
c. Press key 0 or 10 on remote commander to select item.
d. Press key 1~9 on remote commander directly. Star (*) mark will move accordingly.
e. Press key ENTER or SELECT to decide and advance next step.
Press Remote Commander key RETURN to return to the previous page.

Save changing data by Service Mode 2 
3. To change category, item and data :
a. Press key 2 or 5 on remote commander to select (up or down) category.
b. Press key 1 or 4 on remote commander to select (up or down) Item.
c. Press key 3 or 6 on remote commander to change (up or down) data.
Remote commander key : 1, 2, 3 is for increment
Remote commander key : 4, 5, 6 is for decrement
4. Press key mute +0 on remote commander . It shows red WRITE.
5. After a while, red WRITE dissapears. Green DONE will be displayed.
1. This is only required only when B Board is replaced.
2. Items in Digital service mode for 002 MODEL category.
000 SEG .....Select segment information
001 DEST.....Select destination information
002 MODELNAME......Select Model Name
003 SERIAL.....Can be set Only Once for the new board
7. Please save the item SEG, DEST, MODELNAME sequentially. SEG >DEST >MODELNAME
8. When Saving the item "SEG", sometimes instead of
"Writing", word "Pending" will appear. In this case, skip the
"SEG", save the "DEST" and "MODELNAME" is OK.
6. For the item SEG, DEST MODELNAME, after changing each item, service save(mute+0) is needed. For the item SERIAL, after inputting the serial number, press key 12 or Enter, the serial data will be saved.

White Balance Adjustment

To access to White Balance Service mode, choose VPC Service Mode.
a. Press key 1 or 4 on remote commander to select WB adjustment menu. 006 WB category will be seen on the menu.
b. Change data by pressing 3 or 6. Each range of these items is 0-255.
c. Press mute ＋ 0 on remote commander to save the data. SERVICE comment is changed to WRITE, indicating writing process.
d. After a while, WRITE comment returns to SERVICE, which means writing process is done. (takes about a couple of seconds)
Restore WB / Gamma adj-data to B board.

In VPC service mode:
a. Select 000 DATA_COPY category by pressing key 2 or 5 on remote commander.
b. Change data from 0 to 1 by pressing key 3 or 6 on remote commander.
c. Wait until data is changed from 1 to 3.
d. When data is changed from 1 to 3, restoring process is finished.
e. In case data is changed from 1 to 2, keep default setting. (No more process is needed.)

Notes:
1. This restoration should be applied after USB-DL being assembled when B Board is replaced.
2. This process only applicable for 120Hz / 240Hz models only.

Change the emitter output level (Applicable only for TD model).
1. Purpose to reduce the emitter LED output power strength.
2. Select VPC service mode and then press:
a. Select 005 TD category by pressing key 2 or 5 on remote commander.
b. Select 000 EMIT_STR item by pressing key 1 or 4 on remote commander.
c. Change data from 0 to 1 by pressing key 3 or 6 on remote commander.
0: Strong (Default)
1: Weak
d. Save by pressing Mute & 0 or 10 & Reboot.

Viewing VCOM Test Pattern
Step 1

To access VCOM Step 1, please select Digital Service Mode first
a. Select 003 DIG_SRV_MODE category by pressing key 2 or 5 on remote
commander.
b. Press key 0 on remote commander to go to TEST PATTERN Mode.
c. Press key Enter or 1 or 2 on remote commmander to go into Video TEST PATTERN.
d. Press key 7 or 8 on remote commander to select the test pattern
e. Press key Enter or Select on remote commander twice to show the VCOM
Step 2
To access VCOM Step 2, please select VPCService Mode first

a. Select 002 VCOM category by pressing key 2 or 5 on remote commander.
b. Select 000 ENABLE item by pressing key 1 or 4 on remote commander.
c. Change ENABLE from 0 to 1 to enable VCOM adjustment.

Step 3

To access VCOM Step 3, please select VPC Service Mode.
a. Select 002 VCOM category by pressing key 2 or 5 on remote commander.
b. Select 001 ADJUST item by pressing key 1 or 4 on remote commander.
c. Change data by pressing key 3 or 6 on remote commander.
d. Finish the adjustment when the picture seems OK.

Step 4

To access VCOM Step 4, please select Digital Service .
a. Select 007 VCOM category by pressing key 2 or 5 on remote commander.
b. Change data from 1 to 0 by pressing key 3 or 6 on remote commander.
c. Confirm the final result of the VCOM adjustment .
d. If OK, Finish the VCOM adjustment. If NG, pressing key 3 or 6 to show the OSD again and go back to VCOM adjustment STEP3

SELF DIAGNOSTIC FUNCTION

Accessing Self Diagnostic Menu

1. While LCD TV set is on standby mode, press the following
sequence on the Remote Commander key. (RM-GD020)
 i+ >5 >Vol Down >TV Power

2.To Reset Error Count & Error History: Press 8  >  0 key

3. To Reset Panel Operation Time (Applicable Only when Panel is replaced): Press < 7 >  < 0 > key

4.To exit, turn the power off using Remote Commander key.

LED BLINKING ERROR CODES 

Blinking Times	Error	Countermeasure to replaced
2	Main Power Error	Power Supply Board Main Board
3	Main Board / DC Alert Error / Audio Error	Main Board
4	Balancer Error / MM SPI Error / VLED Error	Not applicable for this
5	Tcon Error / HFR Error / FRC No	Not applicable for this
	Panel ID NVM Error	Tcon Panel Module
6	Backlight Error	Power Supply Board Main Board Panel
7	Temperature Error	Main Board
8	Software Error	Main Board Wifi (Not applicable for this manual)
10	Emitter Board Power Error	Not applicable for this MANUAL