LG 42PT81 Service Manual page 22

12. In the case of an unusual display in SCART 2_YC mode(main).
Is the video
input of the A/V jack
normal?(Check
R115,R149)
Yes
Sam as Block A
13. In the case an unusual display in RF mode(Sub).
Is the
video output of the
Tuner normal? (Check
TU201_Pin14)
Yes
B
Is the
video output of the
CXA2069Q normal? (Check R312,
in case of S-Video
Check R312,
R314)
Yes
Is the LVDS
Cable connected?
Yes
Change the IC(IC700)
14. In the case PIP doesn't display in other mode(Sub).
- Same as the case of main except block A should be change to B
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No
Check the input source.
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.
Is the
No
input voltage
normal?(Check Pin8,
Pin6)
No
Check the power.
Is the
Yes
L308)
No
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Is the I2C communication
Yes
normal?
(Check Pin5, Pin4)
Check the Tuner.
Is the
I2C communication
normal? (Check
R309, R310)
No
Change the IC(IC300).
LGE Internal Use Only
No