Trouble Shooting Table - Sharp LC-52D62U Service Manual

LC-46D62U/LC-52D62U
CHAPTER 6.
LC-46D62U

TROUBLE SHOOTING 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
V1.PLUG detection func-
tion?
Check the line between pin
(5) of input terminal (J501)
and pin (70) of IC501
(AV_SWITCH).
Is there the COMPOSITE video signal input
at pin (65) of IC501 (AV_SWITCH)?
Check the line between pin
(4) of J501 and pin (65) 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 (71) of IC501 (AV_SWITCH)?
NO
YES
YES
YES
YES
Service Manual
No video (1)
[INPUT-2]
Is INPUT-3 selected on the input select menu
screen?
NO
Select INPUT-2 on the
input select menu
screen.
Does the INPUT-2
V2PLUG detection func-
tion?
Check the line between
pin (5) of input terminal
(J502) and pin (76) of
IC501 (AV_SWITCH).
Is there the COMPOSITE Video signal input at
pins (3) of IC501 (AV_SWITCH)?
NO
Check the line between
pin (4) of J502 and pin
(71) of IC501.
6 – 1
COMPOSITE: No external input video [INPUT-3]
YES
Select INPUT-3 on the input
select menu screen.
Does the INPUT-3 V3.PLUG
detection function?
Check the line between pin (2) of
input terminal (J501) and pin (2)
of IC501 (AV_SWITCH).
Check the line between pins (1)
of J501 and pins (3) of IC501.
YES
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.
NO
NO