LG 42PQ301R-ZB (CHASSIS:PP91B) Service Manual ▷ View online
Making
Revision
2009. 2 . 1
PDP TV
Symptom
Repair Process-Reference data
Check voltage on Power board
A22
B. Power Problem
Checking Order
Checking Order
Pin Map
Power B/D↔Main B/D
(P813) (P1100)
7
6
5
4
3
2
1
No.
Mechanical switch on
Low
(GND Value)
KEY-ON
High(3.3V~5V)
RL_ON
High(3.3V~5V)
AC DET
5V
STBY 5V
Check the other pin’s output
High(3.3V~5V)
Vs-ON
High(3.3V~5V)
M5V_ON
Remark
Spec
Checking
Point
A22
Making
Revision
2009. 2 . 1
PDP TV
Symptom
Repair Process-Reference data
Power board Checking Method
A23
B. Power Problem
① Check soldering status on each major component.
② Check there is problem on major component or not by eye.
(CONDENSER, FET, IC, Resistor)
③ Check FUSE.
④ Check 5V,Va,Vs voltage
※ PSU Maker: 1)LG IT 2)Sanken 3)Lite-On
※ If happen Power board Protection,
check whether there is Short or Open on Y-SUS, Z-SUS B/D or not.
▣ Checking Method
Va Voltage ADJ
- value
+ value
Adjust way
M5V
9
NC
3
VS
2
VS
1
Va
6
GND
5
GND
4
M5V
10
GND
8
Va
7
P811
Pin
Power B/D↔ Y-Sus B/D
◆ Check 5V,Va,Vs voltage
→ For Voltage specification,
refer to the PDP Module Label.
Fuse
Vs Voltage ADJ
◆ Adjust Va,Vs voltage.
Vs adjust
Va adjust
A23
Making
Revision
2009. 2 . 1
PDP TV
Symptom
Repair Process-Reference data
Check Power off History
A24
B. Power Problem
▣ Check Power off History by using SVC Remocon
Press “In-start” →Press” 0000” → Select “Power Off History” → Pop up Module Rom ver.
Appear Power off history 5ea.
(1 is the latest history)
LAST HISTORY 1~5
In case that there is no signal for 15minutes
NO SIGNAL OFF
After turn on by OnTimer, There is no operation for 2hours
2HOUR OFF
Mechanical power switch off
KEY OFF
Power off by Remote control
RCU OFF
A24
Speaker
Jack for Speaker connection
1.Check whether speaker jack was inserted properly on Mian B/D side & speaker side or not.
2. Check whether speaker cable have problem (disconnection wire) or not.
2. Check whether speaker cable have problem (disconnection wire) or not.
A25
Making
Revision
2009. 2 . 1
PDP TV
Symptom
Repair Process-Reference data
Speaker cable checking method
C. Sound Problem
A25
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