Sharp LC-65D90U - Page 41

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LC-65D90U
TROUBLE SHOOTING TABLE (Continued)
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
NO
NO
NO
NO
YES
NO
NO
YES
NO
NO
YES
NO
No external line input <INPUT-3>
Is INPUT-3 selected on the input select menu
screen?
Are the signals inputted to the input
terminals of IC3800 (AV SWITCH)?
<Composite video signal input>
Is the video signal inputted to pin (3) of
IC3800?
<S-video signal input>
Are the Y and C signals inputted to pins (5)
and (7), respectively, of IC3800?
See if the video signal detection function
works. Check the line between pin (11) of
J1106 and pin (2) of IC3800.
See if the S-video signal detection function
works. Check the line between pin (6) of
SC1105 and pin (6) of IC3800.
Select INPUT-3 on the input select menu
screen to have a desired input signal.
IIf the INPUT-3 characters on the menu
screen are gray and impossible to select:
Check the line between pin (8) of J1106
and pin (3) of IC3800.
Check the line between pins (3 and 4) of
SC1105 and pins (5) and (7) of IC3800.
At the input of <composite video/S-video signals>
<Composite video signal input> Is the video signal outputted to pin (60) of IC3800?
<S-video signal input> Are the Y and C signals outputted to pins (60) and (59), respectively, of IC3800?
<Composite video signal input> Is the video signal inputted to pin (1) of IC3807 (MULTIPLEXER)?
<S-video signal input> Are the Y and C signals inputted to pins (1) and (5), respectively, of IC3807 (MULTIPLEXER)?
No picture comes out (2) No picture at UHF/VHF broadcast reception
No picture at digital broadcast reception
Is the video signal outputted to the output
terminal pin (17) of tuner (TU1101)?
Check or replace the tuner and its peripheral
circuits.
Is the video signal inputted to pin (7) of
IC1103 (LEVEL ADJ)?
Is the level adjustment control signal fed
from pin (1) of IC1105 to pin (6) of IC1103?
Is the video signal inputted from the digital
unit to the AV unit's connector (DA_P1105)?
Check the digital unit.
Is the digital video signal inputted to input
terminal pins (90) thru (122) of the main
unit's connector (DM_SC2100)?
Check the digital unit.
Check or replace IC1105 (CONTROL) and
its peripheral circuits.
Is the tuner video signal inputted to pin (17)
of IC3800 (AV SWITCH)?
Check IC3800 (AV SWITCH) and its
peripheral circuits.
Check the line between IC3800 and IC3807.
(Q3807, Q3805, etc.)
<Composite video signal input> Is the video signal outputted to pin (20) of IC3807 (MULTIPLEXER)?
<S-video signal input> Are the Y and C signals outputted to pins (20) and (18), respectively, of IC3807 (MULTIPLEXER)?
<Composite video signal input> Is the video signal outputted to pin (22) of the AV unit's connector (PB_P5404)?
<S-video signal input> Are the Y and C signals outputted to pins (22) and (20), respectively, of the AV unit's connector (PB_P5
404)?
Make sure the control signal is inputted to
pins (3) and (22) of IC3807.
Check the line between IC3807 and P5404.
(Q3803, Q3808, Q3802, Q3809, etc.)
<Composite video signal input> Is the video signal inputted to pin (22) of the main unit's connector (PB_CN1800)?
<S-video signal input> Are the Y and C signals inputted to pins (22) and (20), respectively, of the main unit's connector (PB_C
N1800)?
<Composite video signal input> Is the video signal inputted to pin (2) of IC402 (I.P.F.) via the buffer Q404?
<S-video signal input> Are the Y and C signals inputted to pins (8) and (6), respectively, of IC402 (I.P.F.) via the buffer Q40
4?
Check the B-to-B connector "PB".
Check the line between connector PB and
IC402. (Q404, Q413, etc.)
<Composite video signal input> Is the video signal inputted to pin (135) of IC400 (3D-YC & CHROMA) via the buffer Q408?
<S-video signal input> Are the Y and C signals inputted to pins (135) and (149) of IC400 (3D-YC & CHROMA) via the buffers Q408
and Q409, respectively?
Is the digital video signal outputted from the output terminals of IC400?
Check the line between pins (27) and (28) of IC402 and pin (135) of IC400.
Check the Y signal line between pins (19) and (20) of IC402 and pin (135) of IC400, as well as
the C signal line between pin (22) of IC402 and pin (149) of IC400.
Check IC400 and its peripheral circuits.