Sharp LC-37AD5E Service Manual page 53

<When EXT3 is used for external input>
No EXT3 output of the external input system.
Checklist:
1) Is "INPUT SOURCE" button
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS set to "MIN"? ••• Set it to an appropriate level.
3) Check the connection to the external device ••• Connect it correctly as per the operation manual for the device.
Is composite video signal sent to pin (1) of A/V-IN-TERMINAL
(J1201)?
Is composite video signal (IN3-CVBS) sent from pins (2) of
IC1201 (SW)?
Is composite video signal (IN3-CVBS) sent to input terminal pin
(4) of IC2705 (SW)?
Is composite video signal (IN3-CVBS=VIN7) sent to input termi-
nal pin (184) of IC3002 (VCT)?
Refer to "No video output in all modes".
<When EXT3 is used for external input>
No EXT3-Y/C output of the external input system.
Checklist:
1) Is "INPUT SOURCE" button
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS set to "MIN"? ••• Set it to an appropriate level.
3) Check the connection to the external device ••• Connect it correctly as per the operation manual for the device.
Is Y/C signal sent to pins (11) and (7) of S-TERMINAL (J1201)?
Is Y3 signal (IN3-Y) sent from pin (2) of IC1201 (SW)?
Is Y3 signal (IN3-Y) sent to input terminal pin (4) of IC2705 (SW)?
Is Y/C signal (VIN7/VIN8) sent to input terminal pins (184) and
(183) of IC3002 (VCT)?
Refer to "No video output in all modes".
No picture on the display (9)
on the remote control set up correctly? ••• See the operation manual and set "INPUT SOURCE" to "EXIT3".
YES
YES
YES
YES
No picture on the display (10)
on the remote control set up correctly? ••• See the operation manual and set "INPUT SOURCE" to "EXIT3".
YES
YES
YES
YES
NO Check external connection, input setting, A/V-IN-TERMINAL
(J1201) and peripheral circuits.
NO Check IC1201 and peripheral circuits.
NO Check CONNECTOR (P1102/SC2703), and peripheral circuits.
NO Check IC2705 (SW) and peripheral circuits.
NO Check external connection, input setting, S-TERMINAL (J1201)
and peripheral circuits.
NO Check IC1201 and peripheral circuits.
NO Check CONNECTOR (P1102/SC2703), and peripheral circuits.
NO Check IC2705 (SW) and peripheral circuits.
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LC-37AD5E