DOWNLOAD LG 50PX950-AA (CHASSIS:PA02B) Service Manual ↓ Size: 4.12 MB | Pages: 62 in PDF or view online for FREE

Model
50PX950-AA (CHASSIS:PA02B)
Pages
62
Size
4.12 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
50px950-aa-chassis-pa02b.pdf
Date
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LG 50PX950-AA (CHASSIS:PA02B) Service Manual ▷ View online

Making 
전자 - 6-2
Repair Process
Revision 
1/9
PDP TV
Symptom
A. Picture Problem
No Picture/Sound OK
Check Module pattern 
by using “TILT” key
on SVC R/C
Normal
N
Check
Vs, Va
Y
Normal
N
Check voltage
. -V
Y
. V
SC
. V
ZB
※Refer to the Module label for each voltage
Y
N
1. Check Y-Sus/ Z-Sus Board
2. Replace defective B/D
Check B+ Voltage
on Power Board
/ Control Board
.Check B+(5V)
Y
1.Check Control Board
. LED on
. Crystal(X101)
. 1.8V, 3V, 5V FET
. Rom update
2.Replace Control B/D
<SVC R/C & Pattern>
Check
Sound
Sound
OK
Y
Close
Y
Move 
No Picture/No sound
Section
Check 
LVDS Cable 
Replace
Main B/D
Normal
N
Y
N
Move 
Power problem
Section
Normal
Normal
Move 
Power problem
Section
N
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,Y-Sus B/D ↔Z-Sus B/D,LVDS Cable,Speaker Cable,IR B/D Cable,,,)
-V
Y
V
SC
V
ZB
2010. 8 . 13
Making 
전자 - 6-2
Revision 
2/9
PDP TV
Symptom
A. Picture Problem
No Picture/No Sound
Repair Process
2
Check IR operation
Power 
LED ON?
Latest S/W update
from GCSC 
(Firmware Management)
N
Y
OSD
appear?
Y
N
Y
N
Close
Check Module pattern 
by using “TILT” key
on SVC R/C
Normal
N
Check
Sound
Sound
OK
Y
N
Close
Y
Check 
LVDS Cable 
Replace
Main B/D
Normal
Y
N
Replace
Main B/D
Normal
Check Input signal
. RF Cable connection
. SCART Cable connection
. HDMI Cable connection
. Component Cable …
Normal
Y
N
Repair/Replace
IR B/D
Check
Vs, Va
Normal
Check voltage
. -V
Y
. V
SC
. V
ZB
Y
N
Move 
Power problem
Section
Normal
Y
Check B+ Voltage
on Power Board
/ Control Board
.Check B+(5V)
Normal
1.Check Control Board
. LED on
. Crystal(X101)
. 1.8V, 3V, 5V FET
. Rom update
2.Replace Control B/D
Y
N
Move 
Power problem
Section
1. Check Y-Sus/ Z-Sus
Board
2. Replace defective B/D
N
2010. 8 . 13
Making 
전자 - 6-2
Revision 
3/9
PDP TV
Symptom
A. Picture Problem
Mal-discharge/Noise/dark picture
Repair Process
3
Y
N
N
Mal-discharge
Dot 
type
Check CTRL ROM Ver.
and
Rom Upgrade
Normal 
Picture?
Y
Close
Replace
Control board 
Normal 
Picture?
Y
Close
Replace
Module 
N
Scan
Type
Check
Picture problem
Type
Check voltage
. –V
Y 
/  V
SC
(Y-Sus B/D)
Normal 
Picture?
Replace
Y-Sus B/D 
Normal 
Picture?
Y
N
1.Check Control B/D
2.Replace Board
Normal 
Picture?
Check 
Y Drive B/D 
& 
Replace B/D
Y
Close
N
Dark Picture
Normal 
Picture?
Y
Replace
Module 
N
Close
1. Check Z-Sus Board
2. Replace Board
Check 
Picture mode
setting 
Picture Noise
Normal 
Picture?
Y
N
Close
Y
N
Check RF Cable
Connection
Check Tuner 
& Replace
Normal 
Picture?
※Check Discharge resistance (10Ω 2~3ea)  
on Power B/D before replace Y Drive B/D
Close
Close
2010. 8 . 13
Making 
전자 - 6-2
Revision 
4/9
PDP TV
Symptom
A. Picture Problem
Picture broken/Freezing
Repair Process
4
Y
N
N
Check RF Signal level
Normal 
Signal?
Check RF Cable 
Connection
1. Reconnection
2. Install Booster
Check
S/W Version
Booster menu
On→Off: Check
Off→On: Check
S/W Upgrade
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc
SVC 
Bulletin?
Replace
Main B/D
Check
Tuner soldering
Normal 
Picture?
Y
N
Y
Close
Normal 
Picture?
Y
Close
■ Menu→Setup →Booster
. By using Digital signal level meter
. By using Diagnostics menu on OSD
( Menu→Press Red Key on R/C→Enter Signal Test)
- Signal strength (Normal : over 50%)
- Signal Quality  (Normal: over 50%)
Normal 
Picture?
Y
Contact with signal distributor
or broadcaster (Cable or Air) 
N
N
Normal 
Picture?
Y
Close
N
2010. 8 . 13
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