LG DU-42PY10X Service Manual page 13

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.)
9. POWER PCB Assy Voltage
Adjustment
(Va, Vs Voltage Adjustment)
9-1. Test Equipment :
9-2. Connection Diagram for Measuring
Refer to Fig 1.
<Fig. 1-1> Connection Diagram of Power Adjustment for
Measuring (Power Board): 42"
<Fig. 1-2> Connection Diagram of Power Adjustment for
Measuring (Power Board): 50"
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ADJUSTMENT INSTRUCTIONS
D.M.M 1EA
- 13 -
9-3. Adjustment (42", 50")
(1) Va Adjustment
1) Connect + terminal of D.M.M to Va pin of P805 and
connect – terminal to GND pin of P805.
2) Adjust VR351 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
(2) Vs Adjustment
1) Connect + terminal of D.M.M to Vs pin of P805 and
connect – terminal to GND pin of P805.
2) Adjust VR551 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
(3) 3.4V Adjustment
1) Connect + terminal of D.M.M to 3.4V pin of P802 and
connect – terminal to GND pin of P805.
2) Adjust VR251 voltage to be 3.4V. (Deviation : ±0.1V)
9-4. Adjustment(60")
(1) PFC Adjustment
1) After receiving 100% White Pattern, HEAT RUN.
2) Connect + terminal of DMM to PFC + terminal of
P803A,connect - terminal of DMM to GND of P803A.
3) Adjust VR801 until voltage reading is 380V(±1V).
<Fig. 1-3> Connection Diagram of Power Adjustment for
Measuring (PFC Board): 60"
(2) Va Adjustment
1) Connect + terminal of D.M.M to Va pin of P8011 and
connect – terminal to GND pin of P8011.
2) Adjust VR8401 voltage to match that of the label on the
Top/Right of the panel.(Deviation : ±0.5V)
(3) Vs Adjustment
1) Connect + terminal of D.M.M to Vs pin of P8011 and
connect – terminal to GND pin of P8011.
2) Adjust VR8501 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)