Read Sharp LC-46DH77E (serv.man5) Service Manual online
LC-42DH77E/RU/S/V, LC-46DH77E/RU/S/V
4 – 13
<During external connection> No picture on the monitor (3)
No picture from EXT1 appears on EXT2-connected monitor.
Is CVBS signal output into pin (19) of EXT2 (SC501)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
Is CVBS signal output to pin (65) of IC503?
YES
Check the line between IC503 and EXT2 (SC501).
NO
Is CVBS signal sent to pin (100) of IC503?
YES
Check the IC503 and peripheral circuits.
NO
YES
Is the I2C SERIAL DATA/CLOCK communication normal?
Pin32: SDA1/Pin31: SCL1
Pin32: SDA1/Pin31: SCL1
Is CVBS signal sent to pin (20) of EXT1 (SC502)?
YES
Check the line between EXT1 (SC502) and IC503.
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
<During external connection> No picture on the monitor (4)
SCART2:
No picture from EXT8 appears on EXT2- connected monitor.
No picture from EXT8 appears on EXT2- connected monitor.
Is CVBS signal output into pin (19) of EXT2 (SC501)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
Is CVBS signal output to pin (65) of IC503?
YES
Check the line between IC503 and EXT2 (SC501).
NO
Is CVBS signal sent to pin (12) of IC503?
YES
Check the IC503 and peripheral circuits.
NO
Is CVBS signal sent to pin (6) of EXT8 (J505)?
YES
Check the line between EXT8 (J505) and IC503.
YES
Check the setting of an external input device that connects with
EXT8.
EXT8.
NO
Is V3_PLUGl detection signal to pin (13) of IC503 input from pin
(7) of EXT8 (J505)?
(7) of EXT8 (J505)?
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