50PC3DB-UL (CHASSIS:PA-63E) - LG TV Service Manual (repair manual). Page 8

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ADJUSTMENT INSTRUCTIONS
5. POWER PCB Assy Voltage 
Adjustment 
(Va, Vs Voltage Adjustment)
5-1. Test Equipment :
D.M.M 1EA
5-2. Connection Diagram for Measuring
Refer to Fig 1.
5-3. Adjustment 
(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 RV401 voltage to match that of the label on the
Top/Right of the panel. (Deviation : ±0.5V) 

6. EDID(The Extended Display 
Identification Data)/DDC
(Display Data Channel) Download
This is the function that enables “Plug and Play".
6-1. 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)
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.)
1
1
1
VsADJ
VR951
VaADJ
VR901
3.3VADJ
VR221
T8
01
T9
01
T1
12
T5
01
L6
01
5V
GND
Va
GND
GND
NC
Vs
Vs
P811
1
1
1
VsADJ
VR951
VsADJ
VR951
VaADJ
VR901
VaADJ
VR901
3.3VADJ
VR221
T8
01
T9
01
T1
12
T5
01
L6
01
5V
GND
Va
GND
GND
NC
Vs
Vs
P811
<Fig. 1-1>  Connection Diagram of Power Adjustment for
Measuring (Power Board): 42” XGA
VsADJ
VR951
5V
GND
Va
GND
GND
NC
Vs
Vs
P811
1
1
1
VaADJ
VR901
3.3VADJ
VR221
T8
01
T9
01
L8
51
T5
01
T1
12
L6
01
VsADJ
VR951
5V
GND
Va
GND
GND
NC
Vs
Vs
P811
1
1
1
VaADJ
VR901
VaADJ
VR901
3.3VADJ
VR221
T8
01
T9
01
L8
51
T5
01
T1
12
L6
01
<Fig. 1-2>  Connection Diagram of Power Adjustment for
Measuring (Power Board): 50”
LCD TV SET
(or Digital Board)
<Fig. 2>

Display

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