LG 42PQ301R-ZB (CHASSIS:PP91B) Service Manual ▷ View online
Making
Revision
2009. 2 . 1
PDP TV
Symptom
A. Picture Problem
Audio check method
A2
Jack for Speaker connection
1.Check Audio output by using oscilloscope
GND ↔ R+ or R- or L+ or L-
Audio output waveform
2.Check whether speaker jack was inserted properly or not.
Repair Process-Reference data
A2
Making
Revision
2009. 2 . 1
PDP TV
Symptom
A. Picture Problem
Check Va, Vs on Power Board
Control Board
Main Board
Power Board
Y-Sus Board
Z-Sus Board
PDP Module Label
Vs Adjustment
(VR901)
Va Adjustment
(VR502)
Va, Vs on Y-Sus B/D
Va, Vs on Power B/D
Check Va, Vs
▶ Check Va & Adjust Va Voltage
(Refer to the Module label for Va specification)
▶ Check Vs & Adjust Vs Voltage
(Refer to the Module label for Vs specification)
Repair Process-Reference data
A3
A3
Making
Revision
2009. 2 . 1
PDP TV
Symptom
A. Picture Problem
PDP Module Label Information
Repair Process-Reference data
PDP Module Label Information.
-Vy Vsc
Vzb
①
②
③
④
②
③
④
⑤
⑥
⑥
⑦
⑧
⑨
⑩
⑪
⑫
⑬
⑭
⑮
A4
A4
Making
Revision
2009. 2 . 1
PDP TV
Symptom
A. Picture Problem
Check & Adjust –V
Y
,V
SC
,V
ZB
voltage
Repair Process-Reference data
Voltage Check & Adjustment :
42G2
Y-Sus Board
Fuse
V
SC
Adjustment
-V
Y
Adjustment
1. -Vy (
-175V
) on Y-Sus B/D
. Check Point:
R201
. Adjustment Point:
VR502
2. Vsc (
140V
) on Y-Sus B/D
- Check Point:
R520 –J263
- Adjustment Point:
VR501
-V
Y
V
SC
V
ZB
A5
<Module Label>
A5
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