- 16 -
LGE Internal Use Only
Copyright ©
LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. Digital RF Trouble Shooting guide
5. Composite Video (Side AV) Trouble Shooting guide
Check RF cable & signal
Check tuner 5V power L3702
Y
Check IIC Signal
TU1003 Pin#3,4
Y
Check IF Signal
TU1003 Pin#10,11
Y
Check X201
and application circuit
Check IC406
Replace L3703
Replace IC3703
N
N
N
Replace IC101
N
Replace IC406
N
Y
Replace X201
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK9901
Can you see the normal waveform?
Check the input of Mstar(IC101).
Measure waveform at C227 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK9901
N
Y
Summary of Contents for 26LQ630H
Page 41: ......
