LG 50PK980-ZA (CHASSIS:PD02C) Service Manual ▷ View online
ⓒ LG Electronics. Inc.2009
Making
전자 - 6-2
Revision
7/9
PDP TV
Symptom
B. Power Problem
Turn off (Instant, under watching)
Repair Process
7
Instant
Turn off
Turn on after pull out connector
between Power B/D & Y-Sus
N
Power LED
Green?
Y
Check Power B/D
Replace Power B/D
1. Check Y-Sus/ Z-Sus Board
(especially Short or Open)
2. Replace defective B/D
※ To check Power B/D Protection
Check
Power Off History
RCU Off
Turn off
Under watching
“Off Timer”
Set?
“Off timer”
Function off
KEY Off
2HOUR Off
NO Signal Off
Y
N
Don’t appear
Power Off History
Move
No Power problem
Section
This is not problem
Normal operation
Normal operation
2010. 2 . 22
ⓒ LG Electronics. Inc.2009
Making
전자 - 6-2
Revision
8/9
PDP TV
Symptom
C. Sound Problem
No sound/ Sound distortion
Repair Process
8
1.No sound(
If HDMI Input only have no sound, download 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
Y
Normal
voltage?
N
Check 17V
(Audio IC B+)
on Power B/D
Check Power B/D
Replace Power B/D
Check Audio IC Short
Replace Main 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 only DTV(Case 1)
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
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
2010. 2 . 22
ⓒ LG Electronics. Inc.2009
Making
전자 - 6-2
Revision
9/9
PDP TV
Symptom
D. General Function Problem
Remote control & Local switch checking
Repair Process
9
1. Remote controller (R/C) operating error
Y
N
Move
Power problem
Section
2. Local (Mechanical) switch 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
Battery of R/C
Check & Repair
Cable connection
Connector solder
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
N
Check R/C
Operation
Normal
operating?
Y
Check & Repair
Cable connection
Connector solder
Connector solder
Normal
operating?
Close
N
Check & Replace
Assembly status
(Key PCB + tool )
Check Key
Output signal
Y
Normal
operating?
Close
N
Normal
Signal?
Repair/Replace
Local switch B/D
N
Replace
Main B/D
Y
2010. 2 . 22
ⓒ LG Electronics. Inc.2009
PDP TV Repair Process Index
- Trouble shooting by input block (Component level check)
14
USB Problem
USB Problem
14
No.
Symptom (L)
Input Block
Page
Remark
1
Power Problem
Power-up Boot fail
1
2
Video Probelm
Digital TV
2
3
Analog TV
3
4
Component
4
5
RGB(D-SUB)
5
6
AV(Scart / CVBS)
6
7
HDMI
7
8
Audio Problem
All Input
8
9
Digital TV / HDMI
9
10
Analog TV
10
11
Component / AV / RGB
11
12
Optical Audio
12
13
No USB
All Input
13
15
Bluetooth Problem
Bluetooth Problem
15
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