No Picture/Sound Ok; Repair Process - LG 50PW450 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, Power B/D ↔ Z-Sus B/D(for 60Inch), LVDS Cable, Speaker Cable, IR B/D Cable)
☞A1
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

☞A2
Check
Y
Sound
Sound
Move
N
No Picture/No sound
Section
☞A5~A6
☞A3
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
☞A12
Check B+ Voltage
Y
on Power Board
Normal
/ Control Board
.Check B+(5V)
N
☞A8~A11
1. Check Y-Sus/ Z-Sus Board
2. Replace defective B/D
V V
SC ZB
1
Making 2010. 11. 16
Revision
Y
Normal Close
N
Replace
Main B/D
Y
Normal
N
Move
Power problem
Section
☞A4
ⓒ LG Electronics. Inc.2010
전자 - 6-2
1/10
☞A13
1.Check Control Board
. LED on
. Crystal(X2), 3.3V, 5V
. Rom update
2.Replace Control B/D