Sharp Aquos LC-42D72U, Service Manual

Page: 34 / 162

LC-42D72U
4 – 3
No video (2)
COMPONENT: No external input video
[INPUT-1]
COMPONENT: No external input video
[INPUT-2]
S-VIDEO: No external input video [INPUT-3]
Is INPUT-1 selected on the input select
menu screen? Is the INPUT-SELECT for
the input signal? Is INPUT-2 selected on the input select
menu screen ? Is the INPUT-SELECT for
the input signal? Is INPUT-3 selected on the input select menu
screen?
YES
NO
YES
NO
YES NO
Select INPUT-1 on the input
select menu screen for the
right input signal. Select INPUT-2 on the
input select menu screen
for the right input signal.
Does the INPUT-1
C1.PLUG detection func-
tion? Does the INPUT-2
C2.PLUG detection func-
tion? Does the INPUT-3 S3.PLUG
detection function?
Check the line between pin
(8) of input terminal (J501)
and pin (38) of IC501
(AV_SWITCH). Check the line between
pin (8) of input terminal
(J502) and pin (40) of
IC501 (AV_SWITCH). Check the line between pin (6) of
input terminal (J503) and pin
(42) of IC501 (AV_SWITCH).
Is there the COMPONENT video signal
input at pins (21) (Y)/ (23) (Pb) and (25) (Pr)
of IC501 (AV_SWITCH)? Is there the COMPONENT video signal
input at pins (27) (Y)/ (29) (Pb) and (31)
(Pr) of IC501 (AV_SWITCH)? Is there the S-VIDEO signal input at pins (5)(Y)
and (7)(C) of IC501 (AV_SWITCH)?
YES
NO
YES
NO
YES
NO
Check the line between the
input terminals of J501 and
IC501 Check the line between
the input terminals of
J501 and IC501 Check the line between pins
(3)(Y)/(4)(C) of J503 and pins
(5)/(7) of IC501.
Is there the COMPONENT video signal output at pins (60) (Y) /
(59) (Pb) snd (58) (Pr) of IC501?
NO
Check IC501 and
its peripheral cir-
cuits.
YES
[COMPOSITE signal input] Is there the COMPONENT video signal output at pins (2), (4) and (6) of connector
(SC501) on the TERMINAL unit?
NO
Check the line
between IC501 and
SC501 (Q501 thru
Q504, etc.).
[S-VIDEO signal input] Is there the video signal output at pins (2)(Y) and (4)(C) of connector (SC501) on the
TERMINAL unit?
YES
[COMPOSITE signal input] Is there the COMPONENT video signal input at pins (2), (4) and (6) of connector
(SC1101) on the main unit?
NO
Check the SC501
and SC1101 con-
nectors.
[S-VIDEO signal input] Is there the video signal input at pins (2)(Y) and (4)(C) of connector (SC1101) on the
main unit?
YES