LG 32LB2R Service Manual page 20

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