No Picture/No Sound - LG 50PK760N-ZC Service Manual

Repair Process
PDP TV
Symptom
Check Module pattern
by using "TILT" key
Normal
on SVC R/C
Move
N
Power problem Normal
Section
Check voltage
. -V
Y
. V
SC
. V
ZB
N
1. Check Y-Sus/ Z-Sus
Normal
Board
2. Replace defective B/D
Check B+ Voltage
on Power Board
/ Control Board
.Check B+(5V)
Move
N
Power problem
Normal
Section
A. Picture Problem

No Picture/No Sound

Y Check
Sound
Sound
N
Check
Vs, Va
Check IR operation
Y
Y
1.Check Control Board
. LED on
. Crystal(X101)
. 1.8V, 3V, 5V FET
. Rom update
2.Replace Control B/D
Y
Y
Check
LVDS Cable
OK
N
Normal
Y
Power
LED ON?
N
Latest S/W update
from GCSC
(Firmware Management)
Normal
Y
Close
2
Making 2010. 2 . 22
Revision
Y
Normal Close
N
Replace
Main B/D
N
Repair/Replace
IR B/D
Check Input signal
. RF Cable connection
Y Y
OSD
. SCART Cable connection
appear?
. HDMI Cable connection
. Component Cable ...
N
Replace
Main B/D
N
전자 - 6-2
2/9
ⓒ LG Electronics. Inc.2009