LG 32LB2R - Unusual Display Troubleshooting; RF and Rear AV Mode Display Issues

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4. In case of becomes unusual display from RF mode(Main)
Insert the cable well.
Yes
Yes
No
Check the power.
(Check L1004)
No
Change the IC(IC300).
No
check the power(L1103).
No
Change the Tuner.
No
Cable inserts well.
Change the IC(IC800).
Is video output
of the tuner(Check T201_
Pin14) normal?
Is the Tunner
Cable connected
well?
Is the Input
voltage(check pin5,
Pin4)
Yes
Yes
No
No
Is
video output
of CXA2069Q normal?
(Check R324, In case of
S-Video check
R324,R328)
Is the LVDS Cable
connected well?
Start check
YesNo
Is normal the
12C communication?(Check
Pin5, Pin4)
Is the
input voltage normal?
(Check L308)
Yes
Is the 12C
communication? (Check
R309, R310)
5. In the case of becomes unusual display from rear AV mode(main)
Check the input source.
Same as Block A.
Yes
No
Is video input of
the A/V jack normal?
(Check R2101)
A