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TROUBLE SHOOTING TABLE
No monitor video output when receiving digital
broadcasting
YES
Is the video signal from the digital unit inputted
to the connectors (DA, P1105) Pin (10)
(Composite) and Pin (8), (6) (S signal) of
AV_UNIT?
YES
Is the video signal inputted to the following
pins of IC1104 (Video_SW)?
<Composite video signal> Pin (8)
<S signal> Pin (11): SY-SUB, Pin (16): SC-
SUB
YES
Is the video signal outputted to the following
pins of IC1104 (Video_SW)?
<Composite video signal> Pin (6)
<S signal> Pin (5): SY-SUB, Pin (3): SC-SUB
YES
Check the monitor output terminals and their
peripheral circuits. (Q1113-5, Q1203-4,
Q1148)
No picture comes out.
NO
Check the digital unit.
NO
Check the line from P1105 to IC1104.
Check the control signals inputted to pins (2),
NO
(7) and (12) of IC1104.
43
(Continued)
LC-65D90U
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