LG 50PZ550-ZA / 50PZ550A-ZA / 50PZ550N-ZA (CHASSIS:PD11A) Service Manual ▷ View online
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
8/10
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
☞A25
Y
Normal
Sound?
N
Close
Check Speaker
jack connection
& Speaker Cable open
☞A23
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
☞A22
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
Problem in external input
(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
☞A2
2010. 11. 16
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
9/10
PDP TV
Symptom
D. General Function Problem
Y
N
Repair Process
9
1. Remote controller (R/C) operating error
Move
Power problem
Section
2. Local KEY 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
☞A26
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)
☞A12
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
☞A26
Replace
Main B/D
Y
Y
N
Check local
key
Operation
Normal
operating?
Check & Repair
Cable connection
Connector solder
Connector solder
☞A26
☞A27
Check Key
Output signal
Y
Normal
operating?
Close
N
Normal
Signal?
Repair/Replace
Local Key B/D
N
Replace
Main B/D
Y
☞A27
Remote control & Local Key & RF emitter checking
2010. 11. 16
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
10/10
PDP TV
Symptom
D. General Function Problem
Remote control & Local Key & RF emitter checking
Repair Process
10
3. RF emitter operating error
Y
N
Check RF
emitter
Operation
Check & Repair
Cable connection
Connector solder
Connector solder
☞A28
Replace RF
emitter board
Y
Display
normally
Close
N
Normal
operating?
N
Replace
Main B/D
Y
☞A28
Check the signal
between the RF emitter
and Mani board
Normal
Signal?
Check the RF emitter
SW Ver. at SVC menu
Normal
operating?
Close
Y
N
2010. 11. 16
ⓒ LG Electronics. Inc.2010
A6
Video Check Method
6
No.
Symptom
Detail
Page
Remark
1
Picture Problem
Check Module pattern by Tilt key
A1
2
Audio check method
A2
3
Check Va, Vs on Power Board
A3
4
PDP Module Label Information
A4
5
Check & Adjust –VY,VSC,VZB voltage
- 50R3 –VY,VSC(Y-Sus) / VZB(Z-Sus)
- 50R3 –VY,VSC(Y-Sus) / VZB(Z-Sus)
A5
6
Fuse Checking Method
A7
7
Y-Sus Board Checking Method(50R3)
A8
8
Z-Sus Board Checking Method(50R3)
A9
11
Check 5V on Power B/D
A12
12
Control Board Checking Method(50R3)
A13
13
Mal discharge Symptom Picture
A14
14
PDP Module Rom Ver. Checking method
A15
15
Y Drive B/D Checking method
A16
17
(Half picture) X- B/D Checking method(50R3)
A18
Next page Continued
PDP TV Repair Process Reference data Index
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