Sharp LC-26SB25E Service Manual page 45

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 U231 supplied?
Is IF signal output from pin (17), (19) of TUNER (TU200) to pin (43),
pin (44) of IC U231 (COFDM)?
TERMINAL UNIT:
Similarly, is communication control carried out between pin
(6)(SCL), pin(9)(SDA), pin(12)(AGC) of TU200, and pin(38), pin
(37), pin(35) of IC U231?
Does Y230 (27MHz) oscillate?
Is MPEG data (TS0INDATA[0..7], TS0INSYNC, TS0INCLK,
TS0INVALID) from IC
(6/7/8/9/11/12/13/14/16/17/18) 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 (A26/D23/C24/B26) of a IC U400?
Refer to "The picture doesn't appear in all modes."
No picture on the display (3)
↓
↓
↓YES
↓YES
↓YES
↓YES
U231 are output to
↓YES
↓YES
↓YES
2008-03-14
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
NO
Each power supply circuit is checked.
NO Check the tuner, IC U231 and their peripheral circuits. Replace
as required.
NO
NO
Check Y230 and its peripheral circuits.
NO Is the control signal between IC U231 and IC U400 normal?
pin (CHN_DEC_RESET, MAIN_SDA, MAIN_SCL, etc.).
NO Check X300/ X400 and its peripheral circuits.
NO
Is the control signal between IC U401 and IC U400 normal?
(RESET_CI, etc.).
45