Sharp LC-26SH7E/RU Service Manual page 64

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?
Is IF signal output from pin (20), (21) of TUNER (TU201) to pin
(R25), pin (T25) of IC U400 ?
Is MPEG data (TS0INDATA0,
TS0INVALID) from IC U400 are output to pin (9), pin (7), pin (6), pin
(8) of a IC U401?
MAIN_UNIT:
Do X300 (60.00MHz)/ X400 (27MHz) oscillate?
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?
Refer to "The picture doesn't appear in all modes."
No picture on the display (3)
↓
↓
↓YES
↓YES
TS0INSYNC, TS0INCLK,
↓YES
↓YES
↓YES
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.).
64