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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 the TS data input to pin (AE4/FERR_UNCOR), (AG5/FECLK),
(AF4/FESTR_PSYNC), (AA4/FED_D) and (AF5/FEVAL_DEN) of
IC5001(H.264_DECODER)?
Is the TMDS signal output from pin (U33, U34/ TMDSH_CLK_P/
N), (T33, T34/ TMDSH_D0_P/N), (R33, R34/ TMDSH_D1_P/N),
and (P33, P34/ TMDSH_D2_P/N) of IC5001?
Is the TMDS signal input to pin (39, 38/ TMDSH_CLK_P/N), (42,
41/ TMDSH_D0_P/N), (45, 44/ TMDSH_D1_P/N), and (48, 47/
TMDSH_D2_P/N) of IC5301(TMDS_SW.)?
Is the TMDS signal output from pin (26, 27/ TMDS3H_CLK_P/N),
(23, 24/ TMDS3H_D0_P/N), (20, 21/ TMDS3H_D1_P/N), and
(17, 18/ TMDS3H_D2_P/N) of IC5301?
Is the TMDS signal input to pin (6, 4/ TMDS3H_CLK_P/N), (8, 7/
TMDS3H_D0_P/N), (11, 10/ TMDS3H_D1_P/N), and (14, 13/
TMDS3H_D2_P/N) of IC1507(TMDS_SW.)?
Is the TMDS signal output from pin (26, 27/ TMDS_CLK_P/N),
(23, 24/ TMDS_D0_P/N), (20, 21/ TMDS_D1_P/N), and (17, 18/
TMDS_D2_P/N) of IC1507?
Is the TMDS signal input to pin (K1, K2/ TMDS_CLK_P/N), (L1,
L2/ TMDS_D0_P/N), (M1, M2/ TMDS_D1_P/N), and (N1, N2/
TMDS_D2_P/N) of IC8101(DIGITAL AV DECODER & MAIN
CPU & VIDEO PROCESSER)?
Refer to "The picture doesn't appear in all modes"
All manuals and user guides at all-guides.com
No picture on the display (3)
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
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 IC5001.
NO
Check IC5001 and its peripheral circuits.
NO
Check the line between IC5001 and IC5301.
NO
Check IC5301 and its peripheral circuits.
NO
Check the line between IC5301 and IC1507.
NO
Check IC1507 and its peripheral circuits.
NO
Check the line between IC1507 and IC8101.
4 – 7
LC-46DH65E/S, LC-46DH66E
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