LG 50PJ350R Service Manual page 27

Repair Process
PDP TV
Symptom
1.No sound(
If HDMI Input only have no sound, upload EDID data)
Check
"Speaker ON/Off" setting
in OSD Menu
2.Sound distortion & sound drop
Check Input signal
→Cable connection
Normal
→Cable open
Sound?
- RF & external
(HDMI,SCART,,,)
Y
Close
Check whether Problem happen
in same output of other equipments or not.
(By connecting same output cable of other equipment)
→ DVD Player ,Set-Top-Box, different maker TV etc
C. Sound Problem
No sound/ Sound distortion
Check Speaker
N
Normal
jack connection
Sound?
& Speaker Cable open
Y
Close
Check
N
AVL off/on
Clear voiceⅡ off/on
Sound?
Explain customer that
Cause is RF Signal's problem (Case 1)
Cause is Equipment's problem (case 2)
Making
Revision
N
SVC
Normal
Sound?
Bulletin?
Y
Close
Check 17V
(Audio IC B+)
on Power B/D
Problem in all input
N
Normal
Sound?
Y
Problem in external input (Case 2)
(SCART,HDMI,,,)
Close
N
SVC
Normal
Bulletin?
Y
N
8
Apply
Y
SVC Bulletin
(S/W Upgrade etc)
N
N
Normal Check Power B/D
voltage?
Replace Power B/D
Apply
Y
Normal
SVC Bulletin
Sound?
(S/W Upgrade etc)
Check Audio IC
Replace Main B/D
ⓒ LG Electronics. Inc.2009
Close
Y
Normal
Sound?
N
Y
Close
N