Sharp LC-22LE320 Service Manual page 84

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
Does not the picture come out when TV (Cable) is received?
TERMINAL UNIT:
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U401 supplied?
Is IF signal output from pin (16), (17) of TUNER (TU102) to pin (29),
pin (30) of IC U101 ?
Is MPEG data (CI_INDATA0, TSYNC, TCK) signal from pin (11),
(8) (9) of IC U101 are output to IC U401?
MAIN_UNIT:
Do X4150 (54.00MHz) oscillate?
Refer to "The picture doesn't appear in all modes."
Does not the picture of the CVBS signal input to SCART1 go out?
TERMINAL UNIT:
Is CVBS signal sent to pin (20) of SCART1 (CN151)?
MAIN_UNIT:
Is CVBS signal sent to pin (AP33) of IC U401?
Refer to "The picture doesn't appear in all modes."
No picture on the display (3)
↓
↓
↓YES
↓YES
↓YES
↓YES
<External input SCART1>No picture on the display (4)
↓
↓
↓YES
↓YES
NO
Each power supply circuit is checked.
NO Check the tuner, IC U101 and their peripheral circuits. Replace
as required.
NO
Check IC U101 and their peripheral circuits. Replace as required.
NO Check X4150 and its peripheral circuits.
NO
Check the setting of an external input device that connects of
CN151.
NO
Check the line between IC U401 and CN151.
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