Sharp Aquos LC-42D72U, Руководство по обслуживанию, Страница: 32 / 162

LC-42D72U
4 – 1
LC-42D72U
Service Manual
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No video (1)
COMPOSITE: No external input video
[INPUT-1]
COMPOSITE: No external input video
[INPUT-2]
COMPOSITE: 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 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. Select INPUT-3 on the input
select menu screen.
Does the INPUT-1
V1.PLUG detection func-
tion? Does the INPUT-2
V2PLUG detection func-
tion? Does the INPUT-3
V3.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 (5) of input terminal
(J502) and pin (76) of
IC501 (AV_SWITCH). Check the line between pin (2) of
input terminal (J501) and pin (2)
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 (71) of IC501 (AV_SWITCH)? Is there the COMPOSITE Video signal input at
pins (3) 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 (4) of J502 and pin
(71) of IC501. Check the line between pins (1)
of J501 and pins (3) of IC501.
Is there the COMPOSITE video signal output at pin (60) of IC501? Check IC501 and
its peripheral cir-
cuits.
NO
YES
Is there the COMPOSITE video signal output at pin (2) of connector (SC501) on the TERMINAL unit? Check the line
between IC501 and
SC501 (Q501 thru
Q504, etc.).
NO
YES
Is there the COMPOSITE video signal input at pin (2) of connector (SC1101) on the main unit?
NO
Check the SC501
and SC1101 con-
nectors.
YES