Sharp LC-37SD1E Service Manual page 48

L C - 3 7 S A 1 E / R U
The unit does not enter the DTV mode. Or, the DTV menu does
not appear.
No video output during DTV reception.
No audio output during DTV reception.
Digital UNIT:
Is a voltage supplied from IC4701(3.3V-REG)/IC4704(1.8V-
REG)?
Do X4001/X4002 oscillate?
D-TUNER UNIT:
Is a voltage of 5V supplied from IC205(SW) and IC206(SW)?
Is a voltage applied to pin(20) (I2CSEL) of P202?
(High=3.3V)
Is CLK/DATA signal sent to pins (21) and (22) of P202 and pins
(1) and (13) of IC204 (COFDM).
Does X202 oscillate?
Check IC202(COFDM)/IC4001(D-Processor).
DTV troubleshooting
NO
NO
The unit does not enter the DTV mode. Or, the DTV menu does not appear.
YES
YES
YES
YES
YES
YES
YES Go to "The unit does not enter the DTV mode. Or, the DTV menu
does not appear."
YES Go to "No video output during DTV reception."
YES Go to "No audio output during DTV reception."
NO Check peripheral circuits of IC4701/IC4704 and pin(7) of IC4701.
NO Check peripheral circuits of X4001/X4002.
NO Check peripheral circuits of IC205/IC206.
NO MAIN UNIT:
Check around the pin (12) of IC1710(FPGA).
NO Check peripheral circuits of IC202(COFDM)/ IC4001(D-Proces-
sor).
NO Check peripheral circuits of X202.
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