50PB4RTH-MA, CHASIS, PP7BB - LG TV Service Manual (repair manual). Page 12

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8. POWER PCB Assy Voltage 
Adjustment 
(Va, Vs Voltage Adjustment)
8-1. Test Equipment :
D.M.M 1EA
8-2. Connection Diagram for Measuring
Refer to Fig 7.
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 P812, connect
– terminal  to GND pin of P812.
3) After turning RV501,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) Connect + terminal of D.M.M to Vs pin of P812, connect
– terminal to GND pin of P812.
2) After turning RV 401, voltage of D.M.M adjustment as
same as Vs voltage which on label of panel right/top
(Deviation ; ±0.5V) 
Each PCB Assy must be checked by Check JIG Set before
assembly. (Especially, be careful Power PCB Assy which can
cause Damage to the PDP Module.)
(Fig. 7)  Connection diagram of power adjustment for measuring
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