Sharp LC-42SB45U Service Manual page 37

Refer to "The picture doesn't appear in all modes."
Does not the picture of the component video signal input (INPUT 1) to Component go out?
Does not the picture of the component video signal input (INPUT 2) to Component go out?
TERMINAL_UNIT:
Is Component Y/Pb/Pr signal sent to pin (2)/Y, (4)/Pb, (6)/Pr of
AV1(CN552) ?
Is Component Y/Pb/Pr signal sent to pin (2)/Y, (4)/Pb, (6)/Pr of
AV1(CN551) ?
MAIN_UNIT:
Is Component Y/Pb/Pr signal sent to pin (AD19)/Y, (AF20)/Pb,
(AD20)/Pr of IC U400?
Is Component Y/Pb/Pr signal sent to pin (AE21)/Y, (AE22)/Pb,
(AE23)/Pr of IC U400?
↓YES
Refer to "The picture doesn't appear in all modes."
Does not the picture of the composite video signal input to AV3(Composite) go out?
TERMINAL UNIT:
Is CVBS signal sent to pin (2) of AV3 (CN650) ?
MAIN_UNIT:
Is CVBS signal sent to pin (AD26) of IC U400?
Refer to "The picture doesn't appear in all modes."
Does not the picture of the Y/C video signal input to AV3(Y/C) go out?
TERMINAL UNIT:
Is Y/C signal sent to pin (8)/Y, (7)/C of AV3 (CN650) ?
MAIN_UNIT:
Is Y/C signal sent to pin (AD25)/Y, (AE26)/C of IC U400?
↓YES
<External input 1 / input 2 (Component)>No picture on the display (4)
↓
↓
↓YES
<External input AV3 input 3 (Composite)>No picture on the display (5)
↓
↓
↓YES
↓YES
<External input AV3 input 3 (Y/C)>No picture on the display (6)
↓
↓
↓YES
2008-03-14
NO Check the setting of an external input device that connects of
CN552.
NO
Check the setting of an external input device that connects of
CN551.
NO
Check the line between IC U400 and CN552
NO
Check the line between IC U400 and CN551.
NO
Check the setting of an external input device that connects of
CN650.
NO
Check the line between IC U400 and CN650.
NO
Check the setting of an external input device that connects of
CN650.
NO
Check the line between IC U400 and CN650.
37
LC-42SB45U