Sharp Aquos LC-46X20E, Service Manual

Page: 113 / 264

LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 15
<When EXT3 is used for external input> No picture on the display (8)
Does not the picture of the Y/C video signal input to EXT3 go out?
MINI AV_UNIT:
Is Y/S signal input into pin (13), (11) of connector P901 from pin
(3)/Y, (4)/C of J902?
NO Check the line between J901 and P901.
TERMINAL UNIT: YES
Is Y/C signal input into pin (5), (7) of IC506 (VIDEO SELECTOR)
from pin (13)/Y, (11)/C of connector P501? NO Check the line between P501 and IC506.
(Connector P901/P501, etc.)
YES
Is the Y/C video signal detection function S3_PLUG signal from
pin (6) of the input terminal J902 normal? NO Check J902 or peripheral circuits.
YES
Is the S3_PLUG signal input to pin (42) of IC506? NO Check the between S3_PLUG_LINE J902 and pin (42) of TER-
MINAL UNIT’s IC506. (connector P901/P501, etc.)
YES
Is Y/C signal output into pin (2), (4) of connector SC501 from pin
(52)/Y, (50)/C of IC506? 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)? NO Check the line between SC1101 and IC3301.
YES
Refer to “The picture doesn’t appear in all modes.”