LG 50PJ250R-TA / 50PJ251R-TB (CHASSIS:PP01A) Service Manual ▷ View online
ⓒ LG Electronics. Inc.2009
Making
Revision
PDP TV
Symptom
C. Sound Problem
No sound/ Sound distortion
Repair Process
1.No sound(
If HDMI Input only have no sound, upload EDID data)
Y
Normal
Sound?
N
Check
“Speaker ON/Off” setting
in OSD Menu
Close
Y
Normal
Sound?
N
Close
Check Speaker
jack connection
& Speaker Cable open
Normal
voltage?
N
Check 17V
(Audio IC B+)
on Power B/D
Check Power B/D
Replace Power B/D
SVC
Bulletin?
Apply
SVC Bulletin
(S/W Upgrade etc)
N
Normal
Sound?
N
Y
Close
Y
2.Sound distortion & sound drop
Check Input signal
→Cable connection
→Cable open
→Cable open
- RF & external
(HDMI,SCART,,,)
Normal
Sound?
Y
Close
Check
AVL off/on
Clear voiceⅡ off/on
Y
Normal
Sound?
N
Close
N
Problem in all input
Problem in external input (Case 2)
(SCART,HDMI,,,)
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
Y
Normal
Sound?
N
Check Audio IC
Replace Main B/D
8
Explain customer that
Cause is RF Signal’s problem (Case 1)
Cause is Equipment’s problem (case 2)
SVC
Bulletin?
Apply
SVC Bulletin
(S/W Upgrade etc)
Normal
Sound?
Y
Close
Y
N
N
ⓒ LG Electronics. Inc.2009
Making
Revision
PDP TV
Symptom
D. General Function Problem
Remote control
Y
N
Repair Process
9
1. Remote control (R/C) operating error
Check R/C itself
Operation
Normal
operating?
Normal
operating?
Y
Close
Replace R/C
If R/C operate,
Explain the customer
cause is interference
from light in room.
Check R/C Operating
When turn off light
in room
Check & Replace
Baterry of R/C
Check & Repair
Cable connection
Connector solder
Normal
operating?
Check B+ 5V
On Main B/D
Normal
Voltage?
Close
N
N
Check 5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
Replace
Main B/D
Y
Y
ⓒ LG Electronics. Inc.2009
You can see 20 types patterns by using TILT Key on SVC Remote controller (except Old model)
< CHECK Item >
< CHECK Item >
1. Dead pixel 2.Image sticking
3.Mal discharge
4.Module defect (V-Line/Bar, H-Line/Bar,,,)
5. In case of no picture, you can judge defect cause (Module or Main B/D)
- If patterns appear, defect cause is Main B/D
Tilt Key
Making
Revision
PDP TV
Symptom
A. Picture Problem
Check Module pattern by Tilt key
Repair Process-Reference data
Item
A1
ⓒ LG Electronics. Inc.2009
Making
Revision
PDP TV
Symptom
A. Picture Problem
Defect type cause by PDP Module
Repair Process-Reference data
A19
1. Check connection
(CTRL B/D, X B/D)
2. Check CTRL B/D
3. Replace CTRL B/D
Many irregular vertical lines
1. Check connection
(Y-Sus B/D ↔Panel)
2. Check Y-Sus B/D
3. Replace Y-Sus B/D
Horizontal Line or Bar
1. Check connection
(CTRL B/D, X B/D)
2. Check CTRL B/D
3. Replace CTRL B/D
Vertical lines or Bar
1. Check connection
(CTRL B/D, X B/D)
2. Check CTRL B/D
3. Replace CTRL B/D
Regular vertical lines
To action
defects description
Symptom picture
First of all, Check whether all of cable between board was inserted properly or not.
Next, Check whether there is foreign material on connector.
Next, Check whether there is foreign material on connector.
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