Z42PQ20-UC (CHASSIS:PU92B) - LG TV Service Manual (repair manual). Page 8

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Caution: Each PCB assembly must be checked by check JIG set.
(Because  power  PCB  Assembly  damages  to  PDP
Module, especially be careful)
Caution: Set up “RF mode(noise)” before voltage adjustment.
6. POWER PCB Ass’y Voltage 
Adjustment
(Va, Vs voltage Adjustment)
6-1. Test Equipment:
D.M.M 1EA
6-2. Connection Diagram for Measuring
Refer to Fig.1, Fig 2, Fig 3
6-3. Adjustment Method 
(1) 50” Va Adjustment (refer fig.1)
1) After receiving 100% Full White Pattern, HEAT RUN.
2)  Connect  +  terminal  of  D.M.M.  to  Va  pin  of  P802,
connect-terminal to GND pin of P802.
3)  After  turning  VR902,voltage  of  D.M.M  adjustment  as
same  as  Va  voltage  which  on  label  of  panel  right/top
(deviation; ±0.5V)
(2) 50” Vs Adjustment (refer fig.1)
1) Connect + terminal of D.M.M. to Vs pin of P802, connect
-terminal to GND pin of P802.
2)  After  turning  VR901,  voltage  of  D.M.M  adjustment  as
same as Vs voltage which on label of panel right/top
(deviation ; ±0.5V)
(3) 42” Va Adjustment (refer fig.2)    
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)
(4) 42” Vs Adjustment (refer fig.2)
1)  Connect  +  terminal  of  D.  M..M.  to  Vs  pin  of  P811,
connect -terminal to GND pin of P811.
2)  After  turning  VR951,  voltage  of  D.M.M  adjustment  as
same as Vs voltage which on label of panel right/top
(deviation ; ±0.5V)
(5) 60” Va Adjustment (refer fig.3)    
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M. to Va pin of P11, connect
-terminal to GND pin of P11.
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)
(6) 60” Vs Adjustment (refer fig.3)
1) Connect + terminal of D. M..M. to Vs pin of P11, connect
-terminal to GND pin of P11.
2)  After  turning  VR951,  voltage  of  D.M.M  adjustment  as
same as Vs voltage which on label of panel right/top
(deviation ; ±0.5V)
ADJUSTMENT INSTRUCTIONS
(Fig. 1) 50inch Power PCB Assy Voltage Adjustment
(Fig. 2) 42inch Power PCB Assy Voltage Adjustment
(Fig. 3) 60inch Power PCB Assy Voltage Adjustment
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