50PT250-ZG, 50PT250A-ZG, 50PT250N-ZG (CHASSIS:PD13K) - LG TV Service Manual (repair manual). Page 28

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Making 
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)
→ DVD Player ,Set-Top-Box, Different maker TV etc
■ Menu→Setup →Booster
. By using Digital signal level meter
. 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%)
Normal 
Picture?
Y
N
Normal 
Picture?
Y
Close
N
N
Check
S/W Version
Booster menu
OnOff: 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
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