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Digital UNIT:
Is a voltage supplied from IC4701 (3.3V-REG)/IC4704 (1.8V-
REG)/IC4702 (5V-REG)?
Do X4001(32.768kHz)/ X4002(27MHz) oscillate?
D-TUNER UNIT:
Does each REG [IC206 (REG), IC208 (REG) and IC205 (REG)]
driving IC202 work normally?
Is a voltage applied to pin (20) (I2CSEL) of P202?
(High=3.3V)
Is FESCL/FESDA signal sent to pins (22) and (21) of P202 and
pins (1) and (13) of IC204 (SW).
Does X202 (27MHz) oscillate?
Check IC202 (COFDM)/IC4001 (D-Processor).
The unit does not enter the DTV mode. Or, the DTV menu does not appear.
YES
YES
YES
YES
YES
YES
NO
Check peripheral circuits of IC4701/IC4704 of IC4702.
(IC4701, IC4704, IC4702, Q4703 and POW-ON_LINE, etc.)
NO
Check peripheral circuits of X4001/X4002.
NO
Check peripheral circuits of IC206/IC208/IC205.
NO
MAIN UNIT:
Check around the pin (1) of IC1710.
NO
Check peripheral circuits of IC202 (COFDM)/ IC4001 (D-Proces-
sor).
NO
Check peripheral circuits of X202.
4 – 7
LC-42AD5E/RU/S
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