Read LG 50PB4RT-MA (CHASSIS:PP78B) Service Manual online
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4. In case of becomes unusual display from RF mode(Main)
A
Is normal video
output of the Tuner?
(Check TU200_Pin14)
Is normal the I2C
communication ?
(Check Pin5, Pin4)
Is normal the
Input voltage?
(Check L308)
Is normal the
Input voltage ?
(Check Pin8, Pin6)
Is normal video
output of CXA2069Q?
(Check R324, In case of S-Video
check R324, R328)
Is the Tuner Cable
connected well?
Change the Tuner
Check the power
Cable inserts well.
Is normal the I2C
communication ?
(Check R309, R310)
Change the IC(IC300)
Check the power
( Check L1004)
Change the IC (IC700)
Is the LVDS Cable
connected well?
Cable inserts well
NO
NO
NO
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
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