47LB5DF (CHASSIS:LA75A) - LG TV Service Manual (repair manual). Page 13

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- 13 -
ADJUSTMENT INSTRUCTION
1. Application Range
These instructions are applied to all of the LCD TV, LA75A
Chassis.
2. Notice
2.1 Because this is not a hot chassis, it is not necessary to
use an isolation transformer. However, the use of
isolation transformer will help protect test instrument. 
2.2 Adjustment must be done in the correct order. But it is
flexible when its factory local problem occurs.
2.3 The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
2.4 The input voltage of the receiver must keep 100~220V,
50/60Hz.
2.5 Before adjustment, execute Heat-Run for 30 minutes. 
O
After Receive 100% Full white pattern (06CH) then
process Heat-run 
(Or 8. Test Pattern condition of Ez – Adjust)
O  
How to make set white pattern 
A.  Press Power ON button of Service Remocon
B.  Press ADJ button of Service remocon. Select "10.
Test pattern" and, after select "White" using
navigation button, and then you can see 100% Full
White pattern. 
* In this status you can maintain Heat-Run useless any
pattern generator 

Notice) If you maintain one picture over 20 minutes
(Especially sharp distinction black with white pattern
– 13Ch, or Cross hatch pattern – 09Ch) then it can
appear image stick near black level
3. PCB Assembly Adjustment
3.1 Using RS-232C
See ADC Adjustment RS232C Protocol_Ver1.0
O
Necessary items before Adjustment items
- Pattern Generator : (MSPG-925FA)
- Adjust 480i Comp1 (MSPG-925FA:model :209 , pattern :65)
- Adjust 1080p Comp1/RGB(MSPG-925FA:model :225 ,
pattern :65)
* If you want more information then see the below Adjustment
method (Factory Adjustment)
O
Adjustment sequence
- ad 00 00 : Enter the ADC Adjustment mode.
- kb 00 04 : Change the mode to Component1 (No actions)
- ad 00 10 : Adjust 480i Comp1(Change the mode and
adjustment action)
- kb 00 06 : Change to RGB-DTV mode(No action)
- ad 00 10 : Adjust  1080p  Comp1/RGB(Change  the  mode
and adjustment action)
- ad 00 90 : End of the adjustment
Order
Command
Set response
1. Inter the Adjustment mode ad 00 00
d 00 OK00x
2. Change the Source
kb 00 04
b 00 OK04x (Adjust 480i Comp1)
kb 00 06  b 00 OK06x (Adjust 1080p Comp1/RGB)
3. Start Adjustment
ad 00 10
4. Return the Response
OKx ( Success condition )
NGx ( Failed condition )
5. Read Adjustment data (main)
(main)
ad 00 20
000000000000000000000000007c007b006dx
(sub)
(Sub)
ad 00 21
000000070000000000000000007c00830077x
6. Confirm Adjustment ad 00 99
NG 03 00x (Failed condition)
NG 03 01x (Failed condition)
NG 03 02x (Failed condition)
OK 03 03x (Success condition)
7. End of Adjustment ad 00 90
d 00 OK90x
Display
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