Read Sharp LC-37XD1E (serv.man4) Service Manual online
LC-37XD1E/RU
4 – 7
DTV troubleshooting 1
The unit does not enter
the DTV mode. Or, the
DTV menu does not
appear.
the DTV mode. Or, the
DTV menu does not
appear.
YES
Go to "The unit does not
enter the DTV mode. Or,
the DTV menu does not
appear."
enter the DTV mode. Or,
the DTV menu does not
appear."
The unit does not enter the DTV mode. Or, the DTV menu does not
appear.
appear.
NO
No video output during
DTV reception.
DTV reception.
YES
Go to "No video output
during DTV reception."
during DTV reception."
Digital UNIT:
Is a voltage supplied from
IC4701(3.3V-REG)/
IC4704(1.8V-REG)?
Is a voltage supplied from
IC4701(3.3V-REG)/
IC4704(1.8V-REG)?
NO
Check peripheral cir-
cuits of IC4701/IC4704
and pin(7) of IC4701.
cuits of IC4701/IC4704
and pin(7) of IC4701.
NO
YES
No audio output during
DTV reception.
DTV reception.
YES
Go to "No audio output
during DTV reception."
during DTV reception."
Do X4001/X4002 oscillate?
NO
Check peripheral cir-
cuits of X4001/X4002.
cuits of X4001/X4002.
YES
D-TUNER UNIT:
Is a voltage of 1.8/3.3V sup-
plied from IC205(REG) and
IC206(REG)?
Is a voltage of 1.8/3.3V sup-
plied from IC205(REG) and
IC206(REG)?
NO
Check peripheral cir-
cuits of IC205/IC206.
cuits of IC205/IC206.
YES
.
Is a voltage applied to
pin(20) (I2CSEL) of P202?
(High=3.3V)
pin(20) (I2CSEL) of P202?
(High=3.3V)
NO
MAIN UNIT:
Check around the pin
(85) of IC1710(FPGA).
Check around the pin
(85) of IC1710(FPGA).
YES
.
Is FESDA/FESCL signal sent
to pins (21) and (22) of P202
and pins (21) and (20) of
IC202 (COFDM).
to pins (21) and (22) of P202
and pins (21) and (20) of
IC202 (COFDM).
NO
Check peripheral cir-
cuits of IC202(COFDM)/
IC4001(D-Processor).
cuits of IC202(COFDM)/
IC4001(D-Processor).
YES
.
Does X-TAL X202 of IC202
oscillate?
oscillate?
NO
Check peripheral cir-
cuits of X202.
cuits of X202.
YES
.
Check
IC202(COFDM)/
IC4001(D-Processor).
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