Read Sharp LC-46X8E (serv.man8) Parts Guide online
LC-46X8E/S/RU
4 – 15
<When EXT3 is used for external input> No picture on the display (8)
The Y/C video signal input from EXT3 doesn’t come out in the display
MINI AV_UNIT:
Is Y/C signal output from pins (3, 4) of J902 (Y/C TERMINAL) to
pins (13, 11) of connector (P901)?
Is Y/C signal output from pins (3, 4) of J902 (Y/C TERMINAL) to
pins (13, 11) of connector (P901)?
NO
Check the line between J901 and P901.
TERMINAL UNIT:
YES
Is Y/C signal output from pins (13, 11) of connector (P501) to
pins (5, 7) of IC506 (VIDEO SELECTOR)?
pins (5, 7) of IC506 (VIDEO SELECTOR)?
NO
Check the line between P501 and IC506.
(Connector P901/P501, etc.)
(Connector P901/P501, etc.)
YES
Is the S3_PLUG signal (pin (6)) for connection detection of Y/C
terminal (J902) normal?
(When connecting terminal: 7V, When opening: 0V)
terminal (J902) normal?
(When connecting terminal: 7V, When opening: 0V)
NO
Check J902, pin (42) of IC506 or peripheral circuits.
YES
Is Y/C signal output from pins (52, 50) of IC506 to pins (2, 4) of
connector (SC501)?
connector (SC501)?
NO
Check the line between IC506 and SC501.
MAIN UNIT:
YES
Is Y/C signal input to pin (2, 4) of connector SC1101?
NO
Check the connector (SC501/SC1101)
YES
Is Y/C signal input to pin (Y4, V9) of IC3301
(VIDEO_PROCESSOR)?
(VIDEO_PROCESSOR)?
NO
Check the line between SC1101 and IC3301.
YES
Refer to “The picture doesn’t appear in all modes.”
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