Picture Problem; No Picture/Sound Ok - LG 50PK760N-ZC Service Manual

Repair Process
PDP TV
Symptom
First of all, Check whether all of cable between board was inserted properly or not.
(Main B/D↔ Power B/D, Power B/D↔ Y-sus B/D,Y-Sus B/D ↔Z-Sus B/D,LVDS Cable,Speaker Cable,IR B/D Cable,,,)
Check Module pattern
by using "TILT" key
Normal
on SVC R/C
Check
Vs, Va
<SVC R/C & Pattern>
A. Picture Problem

No Picture/Sound OK

Check
Y
Sound
Sound
Move
N
No Picture/No sound
Section
Check voltage
Y
. -V
Y
Normal
. V
SC
. V
ZB
N
Move
Power problem
Section
※Refer to the Module label for each voltage
-V
Y
Check
Y
OK LVDS Cable
N
Check B+ Voltage
Y
on Power Board
Normal
/ Control Board
.Check B+(5V)
N
1. Check Y-Sus/ Z-Sus Board
2. Replace defective B/D
V V
SC ZB
Making 2010. 2 . 22
Revision
Y
Normal Close
N
Replace
Main B/D
Y
Normal
N
Move
Power problem
Section
ⓒ LG Electronics. Inc.2009
전자 - 6-2
1/9
1.Check Control Board
. LED on
. Crystal(X101)
. 1.8V, 3V, 5V FET
. Rom update
2.Replace Control B/D