Sharp AQUOS LC-42XD10E, Service Manual

Page: 39 / 192

LC-42XD10E/RU
4 – 7
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." The unit does not enter the DTV mode. Or, the DTV menu does not
appear.
NO
No video output during
DTV reception. YES Go to "No video output
during DTV reception." Digital UNIT:
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.
NO YES
No audio output during
DTV reception. YES Go to "No audio output
during DTV reception." Do X4001/X4002 oscillate? NO Check peripheral cir-
cuits of X4001/X4002.
YES
D-TUNER UNIT:
Is a voltage of 1.8/3.3V sup-
plied from IC205(REG) and
IC206(REG)? NO Check peripheral cir-
cuits of IC205/IC206.
YES
Is a voltage applied to
pin(20) (I2CSEL) of P202?
(High=3.3V) NO MAIN UNIT:
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). NO Check peripheral cir-
cuits of IC202(COFDM)/
IC4001(D-Processor).
YES
Does X-TAL X202 of IC202
oscillate? NO Check peripheral cir-
cuits of X202.
YES
Check IC202(COFDM)/
IC4001(D-Processor).