LG 50PC5DC Service Manual page 12

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.)
5. POWER PCB Assy Voltage
Adjustment
(Va, Vs Voltage Adjustment)
5-1. Test Equipment :
5-2. Connection Diagram for Measuring
Refer to Fig 1.
P811 P811
Vs Vs
Vs Vs
NC NC
GND GND
GND GND
Va Va
GND GND
5V 5V
1 1
<Fig. 1-1> Connection Diagram of Power Adjustment for
Measuring (Power Board): 42" XGA/VGA
P811 P811
Vs Vs
Vs Vs
NC NC
GND GND
GND GND
Va Va
GND GND
5V 5V
1 1
<Fig. 1-2> Connection Diagram of Power Adjustment for
Measuring (Power Board): 50"
ADJUSTMENT INSTRUCTIONS
D.M.M 1EA
VsADJ VsADJ VsADJ
VaADJ VaADJ VaADJ
VR951 VR951 VR951
VR901 VR901 VR901
T8 T8
01 01
T9 T9
01 01
3.3V ADJ 3.3V ADJ
VR221 VR221 T1 T1
12 12
T5 T5
01 01
1 1 1 1
VsADJ VsADJ
VaADJ VaADJ VaADJ
VR951 VR951
VR901 VR901 VR901
T8 T8
01 01
L6 L6
01 01
T9 T9
01 01
L8 L8
51 51
3.3V ADJ 3.3V ADJ
VR221 VR221
T1 T1
12 12
1 1 1 1
T5 T5
01 01
5-3. Adjustment(42"/50")
(1) Va Adjustment
1) Connect + terminal of D.M.M to Va pin of P812(50":
P805) and connect – terminal to GND pin of P812(50":
P805).
2) Adjust VR901 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 P812(50":
P805) and connect – terminal to GND pin of P812(50":
P805).
2) Adjust VR951 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
5-4. Adjustment(Sanken: EAY32929001)
L6 L6
(1) Va Adjustment
01 01
1) Connect + terminal of D.M.M to Va pin of P12 and
connect – terminal to GND pin of P12.
2) Adjust VR951 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 P12 and
connect – terminal to GND pin of P12.
2) Adjust VR901 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V)
<Fig. 1-3> 50" PSU(Sanken: EAY32929001)