Sharp Aquos LC-46D82U, Service Manual

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LC-46D82U/LC-52D82U
4 – 5
No video (3)
No video at UHF/VHF broadcast signal recep-
tion
No video at digital broadcast signal reception
Is the specified TV signal selected on the input select menu screen?
Is there the analog video signal output at the
output pin (13) of tuner (TU1101)? Is there the video signal output at the output pins
(20) and (21) of tuner (TU1101)?
YES
NO
YES
NO
Check the tuner, IC8601 (DE-
MODULATOR) and their periph-
eral circuits (TUN_SDA/SCL,
Q8601). Check the tuner, IC8601 (DE-MOD-
ULATOR) and their peripheral cir-
cuits (TUN_SDA/SCL, Q8601).
NO NO
Is there the video signal output at pin (5) of
IC1103 (LEVEL_ADJ)? Are there the MPEG signal outputs
(US_TS_PKTSYNC, US_TS_EN,
US_TS_DATA, US_TS_CLK) from IC8601?
YES
NO
YES
NO
Does the level adjustment con-
trol signal come from pin (6) of
IC1103 to pin (1) of IC1104? Check IC8601 and its peripheral
control circuits.
NO
Check IC1104 and its peripheral
circuits. Replace as required. Are there the MPEG signal inputs
(US_TS_PKTSYNC, US_TS_EN,
US_TS_DATA, US_TS_CLK) at IC8101 (CPU/
DECODER)?
Is there the CVBS3 signal input at pin (N3) of
IC3301 (VPC)?
YES
NO
Check the line between IC8601 and
IC8101.
YES
NO
Check the line between IC1103
and IC3301 (Q2204, Q2208,
etc.). Are there the MVY[7:0], MVC[7:0] and
MVCLKO/MNSYNCO/MVSYNCO signal outputs
from IC8101?
YES
NO
Check IC8101 and its peripheral
circuits.