Sharp LC-46D65E/RU Service Manual page 40

LC-46D65E/RU
Does not the picture come out when VHF/UHF is received?
Is the video signal (TUNER_CVBS) output from pin (6) of
TUNER (TU7501)?
Is the video signal (TUNER_CVBS) sent to pins (24) of
IC503(AV_SW.)?
Refer to "The picture doesn't appear in all modes."
Does not the picture come out when DTV is received?
Is the prescriptive voltage supplied a power supply terminal of a
TUNER circuit and IC7508 (COFDM - DEMOD)?
(Refer to a circuit diagram.)
Is IF signal sent from pins (16, 17) of TUNER (TU7501) to pins
(40, 39) of IC7508 (COFDM-DEMOD.)?
Check whether I2C signal normally communicates between
TU7501 and IC7508 (COFDM - DEMOD.)
Does X7501 (20.25MHz) oscillate?
Is TS data (FECLK, FESTR_PSYNC, FED_D, FEVAL_DEN)
being output from IC7508 to IC8101 (DIGITAL AV DECODER &
MAIN CPU & VIDEO PROCESSER)?
Is TS data (FECLK, FESTR_PSYNC, FED_D, FEVAL_DEN)
input to IC8101 (DIGITAL AV DECODER & MAIN CPU & VIDEO
PROCESSER)?
Refer to "The picture doesn't appear in all modes."
No picture on the display (2)
YES
YES
No picture on the display (3)
YES
YES
YES
YES
YES
YES
NO Check whether I2C signal normally communicates between
TU7501 and IC7508 (COFDM - DEMOD.)
NO Check the line between TU7501 and IC503.
(IC7503, etc.)
NO Each power supply circuit is checked.
(IC7502, IC9607, IC9604, etc.)
NO Check the tuner, IC7508 and their peripheral circuits.
Replace as required.
NO
NO Check X7501 and its peripheral circuits.
NO Check whether a control signal is normal between IC7508 and
IC9101 (CPLD). (FE_RST, N_TUNER_INT, FERR_UNCOR,
AGCSEL)
NO Check the line between IC7508 and IC8101.
(IC7503, etc.)
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