No Sound/ Sound Distortion; Sound Problem - LG 50PW450 Service Manual

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,,,)
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

☞A25
Check Speaker
N
Normal
jack connection
Sound?
& Speaker Cable open
Y
Close
Check
N
AVL off/on
Clear voiceⅡ off/on
Y
Explain customer that
Cause is RF Signal's problem (Case 1)
Cause is Equipment's problem (case 2)
N
Normal
Sound?
Bulletin?
Y
☞A22
Close
Check 17V
(Audio IC B+)
on Power B/D
☞A2
Problem in all input
Normal
Problem in only DTV
Sound?
N
Problem in external input
Y
(SCART,HDMI,,,)
Close
N
SVC
Normal
Sound?
Bulletin?
Y
N
8
Making 2010. 11. 16
Revision
Apply
Y
SVC
SVC Bulletin
(S/W Upgrade etc)
N
☞A23
N
Normal
voltage?
Y
Check Audio IC Short
Replace Main B/D
Y Apply
SVC Bulletin
(S/W Upgrade etc)
Check Audio IC
Replace Main B/D
ⓒ LG Electronics. Inc.2010
전자 - 6-2
8/10
Close
Y
Normal
Sound?
N
Check Power B/D
Replace Power B/D
Y
Normal
Close
Sound?
N