LG 50PZ550-ZA / 50PZ550A-ZA / 50PZ550N-ZA (CHASSIS:PD11A) Service Manual ▷ View online
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
4/10
PDP TV
Symptom
A. Picture Problem
Picture broken/Freezing
Repair Process
Y
☞A21
4
N
Check RF Signal level
Normal
Signal?
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc
■ Menu→Setup →Booster
. By using Digital signal level meter
. By using Diagnostics menu on OSD
. By using Diagnostics menu on OSD
( Menu→Press red key on R/C →Signal TEST)
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Normal
Picture?
Y
N
Normal
Picture?
Y
Close
N
N
Check
S/W Version
Booster menu
On→Off: Check
Off→On: Check
Off→On: Check
S/W Upgrade
SVC
Bulletin?
Check
Tuner & replace
Main B/D
Normal
Picture?
Y
N
Y
Close
Normal
Picture?
Y
Close
N
☞A6-1, 2
Normal
Picture?
N
Contact with signal
distributor or
broadcaster
(Cable or Air)
Move
No Picture/ Sound Ok
Section
2010. 11. 16
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
5/10
PDP TV
Symptom
A. Picture Problem
Vertical bar/ Horizontal Bar
Repair Process
Check
defect type
Y
N
Y
5
Vertical
Line/Bar
Regular
Vertical
Line / Bar
Check Module pattern
by using “TILT” key
on SVC R/C
☞A1
Normal
Pattern?
1.Check CTRL B/D
2.Replace Board
2.Replace Board
☞A13
Replace
Module
Irregular
Vertical
Line / Bar
1.Check CTRL B/D
2.Replace Board
2.Replace Board
Normal
Picture?
Check Main B/D
Replace Module
(If Main B/D doesn’t cause)
N
Y
Close
1.Connector re-connection
2.Eliminate foreign material on Connector
2.Eliminate foreign material on Connector
N
☞A13
※CTRL B/D: Control board
Check connection
of Connector
(COF,TCP)
on CTRL B/D , X B/D
Check connection
of Connector (FFC)
on Y Drive B/D
☞A20
☞A20
1.Connector re-connection
2.Eliminate foreign material on FFC
2.Eliminate foreign material on FFC
1. Check Y Drive B/D
2. Replace Board
☞A16
Normal
Picture?
N
Y
Close
Replace
Module
1.Check CTRL B/D
2.Replace Board
Normal
Picture?
N
Y
Close
N
Y
Normal
Horizontal
Line/Bar
Normal
Half
No picture
1.Check X B/D
2.Replace Board
2.Replace Board
Normal
Picture?
☞A18
Y
Close
Replace
Module
N
※ H-Line’s Cause is rare CTRL B/D
☞A19
2010. 11. 16
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
6/10
PDP TV
Symptom
B. Power Problem
No Power (Not turn on)
Repair Process
Y
N
Y
N
. Stand-By: Red
. Operating: Blue
. Operating: Blue
6
Power LED
ON?
Check
R/C IR Operation
Normal
☞A26
Check
Power LED
DC Power on
by pressing Power Key
On Remote control
by pressing Power Key
On Remote control
Normal
Close
Y
N
Y
Repair/Replace
IR B/D
N
Check Power cord
was inserted properly
was inserted properly
N
Normal
?
Close
Y
Check ST-BY 5V
on Power Board
Normal
Voltage?
☞A22
N
Normal
Signal?
Y
Check Power B/D
Replace Power B/D
Check
AC DET Signal
on Power B/D
☞A22
Check
RL_ON Signal
on Power B/D
N
Normal
Signal?
Y
Check Main B/D
Replace Main B/D
Check
the other pin’s
Output voltage
on Power B/D
Normal
Close
Y
N
Replace
Power B/D
☞A22
☞A22
☞A23
2010. 11. 16
ⓒ LG Electronics. Inc.2010
Making
전자 - 6-2
Revision
7/10
PDP TV
Symptom
B. Power Problem
Turn off (Instant, under watching)
Repair Process
Instant
Turn off
Turn on after pull out connector
between Power B/D & Y-Sus
N
Power LED
Blue?
Y
Check Power B/D
Replace Power B/D
☞A23
1. Check Y-Sus/ Z-Sus Board
(especially Short or Open)
2. Replace defective B/D
☞A8~A11
※ To check Power B/D Protection
Check
Power Off History
RCU Off
7
Turn off
Under watching
“Off Timer”
Set?
☞A24
“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. 11. 16
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