42PC1D-UB, 42PC1DA-UB (CHASSIS:PA-61B) - LG TV Service Manual (repair manual). Page 13

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ADJUSTMENT INSTRUCTIONS
8-3. Adjustment (42”)
(1) Va Adjustment
1) Connect + terminal of D.M.M to Va pin of P812 and
connect – terminal  to GND pin of P812.
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 and
connect – terminal to GND pin of P812.
2) Adjust VR951 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V) 
8-4. Adjustment (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 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 P805 and
connect – terminal to GND pin of P805.
2) Adjust VR951 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V) 
8-5. Adjustment (60”)
(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 RV501 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 RV401 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V) 
9EDID(The Extended Display 
Identification Data)/DDC
(Display Data Channel) Download
This is the function that enables “Plug and Play".
9-1. HDMI EDID Data Input
(1) Required Test Equipment
1) PC, Jig for adjusting DDC. (PC serial to D-sub
Connection equipment)
2) S/W for writing DDC(EDID data write & read)
3) D-Sub cable
4) Jig for HDMI Cable connection
(2) Preparation for Adjustments & 
Setting of Device
1) Set devices as below and turn on the PC and JIG.
2) Open S/W for writing DDC (EDID data write & read).
(operated in DOS mode)
Vs AD
AD
Va
Vs
VR95
VR90
GND
Va
DMM 
P805 
GND
 
  5V
 -
+
 
 
 
 
P804 
CN1
CN1  
P800 
P803 
P802 
1
1
1
<Fig. 1-2>  Connection Diagram of Power Adjustment for
Measuring (Power Board): 50”
<Fig. 1-3>  Connection Diagram of Power Adjustment for
Measuring (Power Board): 60”
PDP TV SET
(or Digital Board)
<Fig. 2>
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