Chapter 4. Troubleshooting Table; Trouble Shooting Table - Sharp LC-46D92U Service Manual

CHAPTER 4.
LC-46D92U
TROUBLESHOOTING TABLE

[1] TROUBLE SHOOTING TABLE

COMPOSITE: No external input video
[INPUT-1]
Is INPUT-1 selected on the input select
menu screen? Is the INPUT-SELECT for
the input signal?
YES
Select INPUT-1 on the input
select menu screen for the
right input signal.
Does the INPUT-1
V2.PLUG detection func-
tion?
Check the line between pin
(6) of input terminal (J508)
and pin (76) of IC501
(AV_SWITCH).
Is there the COMPOSITE video signal input
at pin (71) of IC501 (AV_SWITCH)?
Check the line between pin
(7) of J508 and pin (71) of
IC501.
YES
Is there the COMPOSITE video signal output at pin (60) of IC501?
Is there the COMPOSITE video signal output at pin (2) of connector (SC501) on the TERMINAL unit?
Is there the COMPOSITE video signal input at pin (2) of connector (SC1101) on the main unit?
COMPOSITE: No external input video
Is INPUT-2 selected on the input select
menu screen?
YES
NO
Is there the COMPOSITE video signal
input at pin (3) of IC501 (AV_SWITCH)?
NO
YES
YES
YES
YES
Service Manual
No video (1)
[INPUT-2]
NO
Select INPUT-2 on the
input select menu
screen.
Does the INPUT-2
V3PLUG detection func-
tion?
Check the line between
pin (6) of input terminal
(J509) and pin (2) of
IC501 (AV_SWITCH).
NO
Check the line between
pin (7) of J509 and pin
(3) of IC501.
4 – 1
LC-46D92U/LC-52D92U
Check IC501 and
its peripheral cir-
cuits.
NO
Check the line
between IC501 and
SC501 (Q501 thru
NO
Q504, etc.).
Check the SC501
and SC1101 con-
NO
nectors.