Sharp LC-26SH7E/RU Service Manual page 52

LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
↓
Does not the picture come out when DTV is received?
↓
TERMINAL UNIT:
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U400 supplied?
↓YES
Is IF signal output from pin (20), (21) of TUNER (TU201) to pin
(R25), pin (T25) of IC U400 ?
↓YES
Is MPEG data (TS0INDATA0,
TS0INVALID) from IC U400 are output to pin (9), pin (7), pin (6), pin
(8) of a IC U401?
↓YES
MAIN_UNIT:
Do X300 (60.00MHz)/ X400 (27MHz) oscillate?
↓YES
Is MPEG data (TS_DATAO, TS_CKO, TS_VALIDO, TS_SYNCO)
from IC U401 are output to pin (B21/A21/B20/C21) of a IC U400?
↓YES
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 (CN500)?
↓YES
MAIN_UNIT:
Is CVBS signal sent to pin (AE24) of IC U400?
↓YES
Refer to "The picture doesn't appear in all modes."
No picture on the display (3)
TS0INSYNC, TS0INCLK,
<External input SCART1>No picture on the display (4)
NO
Each power supply circuit is checked.
NO
Check the tuner, IC U400 and their peripheral circuits. Replace
as required.
NO
is communication control carried out between pin (12)(SCL),
pin(13)(SDA), of TU201, and pin(F24)(TUNER_SCL1), pin
(F25)(TUNER_SDA1), of IC U400?
NO Check X300/ X400 and its peripheral circuits.
NO
Is the control signal between IC U401 and IC U400 normal?
(RESET_CI, etc.).
NO
Check the setting of an external input device that connects of
CN500.
NO
Check the line between IC U400 and CN500.
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