Read LG 42PB4RTH-TB (CHASSIS:PP7BA) Service Manual online
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4. In the case an unusual display in RF mode(Main).
Check the power.(L1004)
Is the
video output of the
CXA2069Q normal? (Check R324,
in case of S-Video
Check R324,
R328)
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
Check the Tuner.(IC300)
No
A
Check the power.
Is the
video output of the
Tuner normal? (Check
TU200_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
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
Check the input source.
No
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