Read LG 42LH301C (CHASSIS:LD91A) Service Manual online
A. Picture Problem
Picture broken/ Freezing
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
. By using Diagnostics menu on OSD
( Menu
Setup
Diagnostic)
- 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
Standard Repair Process
Established
date
Revised date
2008. 3 .05
3/13
LCD TV
Error
symptom
3
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