Sharp Aquos LC-37D90U, Service Manual

Page: 82 / 208

LC-37D90U
6 – 3
No video (1)
COMPOSITE: No external input video
[INPUT-1]
COMPOSITE: No external input video
[INPUT-2]
S-VIDEO: No external input video [INPUT-2]
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 with the S terminal open? Is INPUT-2 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. Select INPUT-2 on the input
select menu screen.
Does the INPUT-1
V1.PLUG detection func-
tion? Does the INPUT-2
V3.PLUG detection func-
tion? Does the INPUT-2 S3.PLUG
detection function?
Check the line between pin
(5) of input terminal (J501)
and pin (70) of IC501
(AV_SWITCH). Check the line between
pin (2) of input terminal
(J501) and pin (2) of
IC501 (AV_SWITCH). Check the line between pin (6) of
input terminal (J503) and pin (6)
of IC501 (AV_SWITCH).
Is there the COMPOSITE video signal input
at pin (65) of IC501 (AV_SWITCH)? Is there the COMPOSITE video signal
input at pin (3) 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 pin
(4) of J501 and pin (65) of
IC501. Check the line between
pin (1) of J501 and pin
(3) of IC501. Check the line between pins
(3)(Y)/(4)(C) of J503 and pins
(5)/(7) of J501.
[COMPOSITE signal input] Is there the COMPOSITE video signal output at pin (60) of IC501? Check IC501 and
its peripheral cir-
cuits.
NO
[S-VIDEO signal input] Is there the video signal output at pins (60)(Y) and (59)(C) of IC501?
YES
[COMPOSITE signal input] Is there the COMPOSITE video signal output at pin (2) of connector (SC501) on the
IF unit? Check the line
between IC501 and
SC501 (Q501 thru
Q504, etc.).
NO
[S-VIDEO signal input] Is there the video signal output at pins (2)(Y) and (4)(C) of connector (SC501) on the IF
unit?
YES
[COMPOSITE signal input] Is there the COMPOSITE video signal input at pin (2) of connector (SC1101) on the
main unit? Check the SC501
and SC1101 con-
nectors.
NO
[S-VIDEO signal input] Is there the video signal input at pins (2)(Y) and (4)(C) of connector (SC1101) on the
main unit?