LG 42PT81 Service Manual page 19

4. In the case an unusual display in RF mode(Main).
Is the
video output of the
Tuner normal? (Check
TU200_Pin14)
Yes
A
Is the
video output of the
CXA2069Q normal? (Check R324,
in case of S-Video
Check R324,
R328)
Yes
Is the LVDS
Cable connected?
Yes
Change the IC(IC700)
5. In the case of an unusual display in rear AV mode(Main).
Is video input of
the A/V jack normal?
Yes
Sam as Block A
Copyright©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Is the
No
Tuner Cable
connected?
No
Re-insert the cable.
No
input voltage
normal?(Check
Check the power.(L1004)
No
Re-insert the cable.
No
Check the input source.
Is the
No
input voltage
normal?(Check Pin8,
Pin6)
Check the power.
Is the
Yes
L308)
No
- 19 -
Is the I2C communication
Yes
normal?
(Check Pin5, Pin4)
No
Check the Tuner.
Is the
I2C communication
normal? (Check
R309, R310)
No
Check the IC.(IC300)
LGE Internal Use Only
No