Read Sharp LC-37D44EBK (serv.man6) Service Manual online
LC-37D44E/S/RU-BK/GY
4 – 8
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
Is the video signal(VIN1) output from pin (6) of TUNER
(TU201)?
(TU201)?
NO
Check whether I2C is normally accessed between named TU201
and IC3001(MAIN_MICON).
and IC3001(MAIN_MICON).
YES
Is the video signal(VIN1) sent to pins (191) of IC3001
(MAIN_MICON)?
(MAIN_MICON)?
NO
Check the line between TU201 and IC3001.
YES
Refer to “The picture doesn't appear in all modes.”
No picture on the display (3)
Does not the picture come out when DTV is received?
Is the voltage of regulation for a TUNER circuit and the
power supply terminal of IC207 (COFDM) supplied?
(Refer to the circuit diagram)
power supply terminal of IC207 (COFDM) supplied?
(Refer to the circuit diagram)
NO
Each power supply circuit is checked.
YES
Is IF signal output from pin (16),(17) of TUNER(TU201)
to pin(10),(11) of IC207(COFDM)?
to pin(10),(11) of IC207(COFDM)?
NO
Check the tuner, IC207 and their peripheral circuits.
Replace as required.
Replace as required.
YES
Similarly, is communication control carried out between
pin (8),(9) of TU201, and pin (20),(21)of IC207?
pin (8),(9) of TU201, and pin (20),(21)of IC207?
NO
YES
Does X201(27MHz) oscillate?
NO
Check X201 and its peripheral circuits.
YES
Is the MPEG data (FESCL, FESDA, FEVALID, FES-
TROUT) output from IC207 to IC4001?
TROUT) output from IC207 to IC4001?
NO
Check if the line between IC207 and IC4001 and the control signals
FERROR_LINE and FERESET_LEINE are normal. (IC4402, etc.)
FERROR_LINE and FERESET_LEINE are normal. (IC4402, etc.)
YES
Are the video signals (DTV_R/G/B, DTV_CVBS) output
from PIN(15,16,17), PIN(18) of IC4001?
from PIN(15,16,17), PIN(18) of IC4001?
NO
Check if IC4001, IC4201(SDRAM), IC4251(FLASH_MEMORY) and
IC4202(B+2.5V_REG) are normal.
IC4202(B+2.5V_REG) are normal.
YES
Are the video signals (DTV_R/G/B, DTV_CVBS) input
to PIN(181,180,179), PIN(184) of IC3001
(MAIN_MICON)?
to PIN(181,180,179), PIN(184) of IC3001
(MAIN_MICON)?
NO
Check the line between IC4001 and IC3001.
(IC1401, IC1001, Q1031, etc.)
(IC1401, IC1001, Q1031, etc.)
YES
Refer to “The picture doesn't appear in all modes.”
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