Read LG 42PT81-ZB (CHASSIS:PP11S) Service Manual online
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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
Check the input source.
No
13. In the case an unusual display in RF mode(Sub).
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
Check the power.(L1004)
Is the
video output of the
CXA2069Q normal? (Check R312,
in case of S-Video
Check R312,
R314)
Is the
input voltage
normal?(Check
L308)
Yes
No
Yes
Is the LVDS
Cable connected?
Yes
Change the IC(IC700)
Re-insert the cable.
No
Change the IC(IC300).
No
B
Check the power.
Is the
video output of the
Tuner normal? (Check
TU201_Pin14)
Is the
input voltage
normal?(Check Pin8,
Pin6)
Is the I2C communication
normal?
(Check Pin5, Pin4)
normal?
(Check Pin5, Pin4)
Yes
No
Yes
No
Check the Tuner.
No
Re-insert the cable.
Is the
Tuner Cable
connected?
No
No
Is the
I2C communication
normal? (Check
R309, R310)
No
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