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Is the video signal (TUNER_CVBS) output from pin (16) of
TUNER (TU1101)?
Is the video signal (TUNER_CVBS) sent to pin (AD29/
TU_CVBS) of IC3302 (Digital AV decode & Main CPU)?
Refer to "The picture doesn't appear in all modes."
Refer to "No sound (during the reception of TV (DIGITAL) broadcasting)"
Refer to "No sound (during the reception of TV (DIGITAL-Satellite) broadcasting)"
Is CVBS signal sent to pin (14) of EXT1 (SC505)?
Is CVBS signal from EXT1 (SC505) sent to pin (AG29/
SC1_CVBS_Y) of IC3302 (Digital AV decode & Main CPU)?
Refer to "The picture doesn't appear in all modes."
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
YES
YES
No picture on the display (3)
Does not the picture come out when DTV is received?
No picture on the display (4)
Does not the picture come out when DTV (Satellite) is received?
[External input EXT1] No picture on the display (5)
Does not the picture of the CVBS signal input to EXT1 go out?
YES
YES
NO
Check the tuner and its peripheral circuits.
Replace as required.
NO
Check the line between TU1101 and IC3302. (Q1106, etc.)
NO
Check the setting of an external input device that connects with
EXT1.
NO
Check the line between SC505 and IC3302.
7 – 9
LC-46/60LE925E
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