50PG20D-AA (CHASSIS:PA81A) - LG TV Service Manual (repair manual). Page 8

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8. POWER PCB Assy Voltage
Adjustments 
(Va, Vs Voltage adjustments)
8-1. Test Equipment :
D.M.M. 1EA
8-2.Connection Diagram for Measuring
: refer to Fig.1
8-3. Adjustment Method
(1) Va Adjustment
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P811, connect
- terminal to GND pin of P811.
3)  After  turning  VR901,  voltage  of  D.M.M  adjustment  as
same  as  Va  voltage  which  on  label  of  panel  right/top.
(Deviation; ±0.5V)
(2) Vs Adjustment
1) Input signal : RF noise signal.
2) Connect + terminal of D.M.M to Vs pin of P811, connect
– terminal to GND pin of P811.
3)  After  turning  VR951,  voltage  of  D.M.M  adjustment  as
same  as  Va  voltage  which  on  label  of  panel  right/top.
(Deviation; ±0.5V)
9. Adjustment of White Balance
9-1. Required Equipment
(1) Color Analyzer : CA-1000, CA-100+(CH.10) CA-210(CH.10).
*  Please  adjust  CA-100+/CA-210  by  CS-1000  before
measuring.
->  You  should  use  Channel  10  which  is  Matrix
compensated(White,  Red,  Green,  Blue  revised)  by  CS-
1000  and  adjust  in  accordance  with  balance  adjustment
coordinate.
Color temperature standards according to CSM and Module.
Change target luminance and range of the Auto adjustment
W/B equipment.
White balance adjustment coordinate and color temperature.
* PC(for communication through RS-232C)
-> UART Baud rate : 115200 bps
Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)
(Fig.1) Connection diagram of power adjustment for measuring
(Fig.2) 50” Full HD Power PCB Assy Voltage adjustment
* Press the POWER ON KEY on R/C before Model name download.
Befor adjusting White-balance, the AV ADC should be done.
If ADC status were “NG”, Need to ADC adjustment.
PLASMA
Remark
11000K
9300K
6500K
Cool
Normal
Warm
CSM
65
20
Range
Target luminance
0.276
0.283
0.000
0.276±0.002
0.283±0.002
0.000
0.276±0.002
0.283±0.002
0.000
X
y
uv
Cool
CS-1000
CA-100+(CH.10) CA-210(CH.10)
0.285
0.293
0.000
0.285±0.002
0.293±0.002
0.000
0.285±0.002
0.293±0.002
0.000
X
y
uv
Medium
CS-1000
CA-100+(CH.10) CA-210(CH.10)
0.313
0.329
0.003
0.313±0.002
0.329±0.002
0.003
0.313±0.002
0.329±0.002
0.003
X
y
uv
Warm
CS-1000
CA-100+(CH.10) CA-210(CH.10)
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