Read Sharp LC-52XL1E (serv.man3) Service Manual online
LC-46XL1E/RU, LC-52XL1E/RU
4 – 6
DTV troubleshooting 1
The unit does not enter
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 circuits
of IC4701/IC4704 and pin
(7) of IC4701.
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 oscil-
late?
late?
NO
Check peripheral circuits
of X4001/X4002.
of X4001/X4002.
YES
D-TUNER UNIT:
Is a voltage of 1.8/3.3V
supplied from IC205
(REG) and IC206 (REG)?
Is a voltage of 1.8/3.3V
supplied from IC205
(REG) and IC206 (REG)?
NO
Check peripheral circuits
of IC205/IC206.
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).
sent to pins (21) and (22)
of P202 and pins (21) and
(20) of IC202 (COFDM).
NO
Check peripheral circuits
of IC202 (COFDM)/
IC4001 (D-Processor).
of IC202 (COFDM)/
IC4001 (D-Processor).
YES
Does X-TAL X202 of
IC202 oscillate?
IC202 oscillate?
NO
Check peripheral circuits
of X202.
of X202.
YES
Check IC202(COFDM)/
IC4001 (D-Processor).
IC4001 (D-Processor).
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