Sharp LC-26D4U Service Manual page 41

TROUBLESHOOTING 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 (7) of
AV_UNIT?
YES
Is the video signal inputted to the following
pins of IC1104 (AV_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 (AV_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)
Picture signal of digital broadcasting is not sent to the monitor/record output terminal.
Are CVBS, S(Y) and S(C) signals sent from
pins 7, 5 and 3 of P8901 respectively?
NO
Are CVBS and S(C) signals sent to pins 6
and 2 of IC8902 respectively?
NO
Check IC8101, IC8301-IC8302
and peripheral circuits.
No picture comes out. (4)
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.
YES
YES
Is pin 3 of IC8902 in the "L" state?
NO
Check peripheral circuits of
IC8902 and IC9602 (A5V voltage).
41
(Continued)
Check cable connections between
P8901 and P1105. Go to TROUBLE
SHOOTING TABLE for the AV PWB.
YES
Check peripheral circuits of
Q8901 and IC8101.
LC-26D4U
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