Sharp LC-19SH7E/RU, Service Manual, Page: 91 / 267

2008-03-14
LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
91
No picture on the display (3)
↓
Does not the picture come out when DTV is received?
TERMINAL UNIT:
↓
↓ YES
↓ YES
MAIN_UNIT:
↓ YES
↓ YES
↓ YES
Is IF signal output from pin (20), (21) of TUNER (TU201) to pin
(R25), pin (T25) of IC U400 ?
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U400 supplied?
NO
Each power supply circuit is checked.
NO Check the tuner, IC U400 and their peripheral circuits. Replace
as required.
NO Is MPEG data (TS0INDATA0, TS0INSYNC, TS0INCLK,
TS0INVALID) from IC U400 are output to pin (9), pin (7), pin (6), pin
(8) of a IC U401? 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?
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?
NO
Is the control signal between IC U401 and IC U400 normal?
(RESET_CI, etc.).
Do X300 (60.00MHz)/ X400 (27MHz) oscillate?
NO
Check X300/ X400 and its peripheral circuits.
Refer to
“
The picture doesn't appear in all modes.
”