37LH55 (CHASSIS:LA92B) - LG TV Service Manual (repair manual). Page 15

4. Updating is staring.

5. Updating Completed, The TV will restart automatically.
6. If your TV is turned on, check your updated version and
Tool option. (explain the Tool option, next stage)

* If downloading version is more high than your TV have, TV
can lost all channel data. In this case, you have to channel
recover. if all channel data is cleared, you didn’t have a
DTV/ATV test on production line.

* After downloading, have to adjust TOOL OPTION again.
1. Push "IN-START" key in service remote controller.
2. Select "Tool Option 1" and Push “OK” button.
3. Punch in the number. (Each model has their number.)
4. Completed selecting Tool option.

4.1 Board-level adjustment

• Adjust 480i Comp1 adj.(Comp1080i & RGB Adjust use internal

pattern).

• EDID/DDC download
Above adjustment items can be also performed in Final
Assembly if needed. Both Board-level and Final assembly
adjustment items can be check using In-Start Menu 1. Adjust
Check.

* After Board level adjustment, set volume setting value 0

4.2 Final assembly adjustment

•White Balance adjustment
•RS-232C functionality check
•Factory Option setting per destination
•Ship-out mode setting (In-Stop)

4.3 Etc.

•Ship-out mode
•Service Option Default
•USB Download(S/W Update, Option)

5.1.1 Overview

ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.

5.1.2 Equipment & Condition

1) Jig (RS-232C protocol) 
2) Input : MSPG-925FS(Model : 209 ,Pattern : 65, Only

component))

3) RGB Adjust use internal pattern.5.1.3 Adjustment

5.1.3 Adjustment

5.1.2.1 Method

• Using RS-232, adjust items listed in 3.1 in the order shown
in 5.1.2.3 Adj. protocol

Ref.) ADC adj. RS232C Protocol_Ver1.0

5.1.2.3 Adj. order

•ad 00 00 [Enter ADC adj. mode]
•ad 00 10 [Adjust 480i Comp1/1080i Comp1/1024*768 RGB]
•ad 00 90 End adj.

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Model 

Tool option1  Tool option2

Tool option3 

Tool option4

37LH55-UA 20993

3400

35748 

1024

42LH55-UA 25089

3400 

35748 

1024

47LH55-UA 33281 

3400 

35748 

1024

Protocol Command 

Set 

ack

Enter adj.

ad 00 00 

d 00 OK00x

mode

Begin adj. 

ad 00 10

Return adj.

OKx (Success)

result

NGx (Fail)

Read adj. 

(main)

(main) 

data

ad 00 20

000000000000000000000000007c007b006dx

(sub )  

(Sub) 

ad 00 21 

000000070000000000000000007c00830077x

Confirm adj. 

ad 00 99

NG 03 00x (Fail)

NG 03 01x (Fail)

NG 03 02x (Fail)

OK 03 03x (Success)

End adj. 

ad 00 90 

d 00 OK90x