Sharp LC-20AV7U Service Manual - Page 26

Audio Signal

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3. AUDIO SIGNAL SECTION FLOW CHART NO.25 Audio is not outputted normally. (Tuner input) Are the SIF signal inputted to the Pin(21) of IC851? No Yes Are the audio(L/R) signals inputted to the Pins(1,12) of No IC852? Yes Are the audio(L/R) signals outputted to the Pins(3,13) No of IC852? Yes Are the audio(L/R) signals outputted to the Pins(11,14) No of IC801? Yes Check SP801,SP802,JK801 and their periphery circuit, and service it if defective. FLOW CHART NO.26 Audio is not outputted normally. (Tuner input (Digital)) Are the DIF signals outputted to the Pins(11, 12) No of CN62? Yes Are the audio (L/R) signals outputted to the No Pin(15, 16) of CN62? Yes Are the audio (L/R) signals inputted to the No Pins(5, 14) of IC852? Yes Are the audio (L/R) signals outputted to the No Pins(3, 13) of IC852? Yes Are the audio (L/R) signals outputted to the No Pins(11, 14) of IC801? Yes Check SP801, SP802, JK801 and their periphery circuit, and service it if defective. Check TU61, IC31, SF11 and their periphery circuit, and service it if defective. Check IC851 and the periphery circuit, and service it if defective. Check IC852 and the periphery circuit, and service it if defective. Check IC801 and the periphery circuit, and service it if defective. Check the line between Pins(11, 12) of CN62 and TU61, and service it defective. Replace DTV MODULE CBA UNIT. Check the line between Pins(5, 14) of IC852 and CN62, and service it defective. Check IC852 and the periphery circuit, and service it if defective. Check IC801 and the periphery circuit, and service it if defective. 7-9 A7144_45TS

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7-9
A7144_45TS
3.
AUDIO SIGNAL SECTION
Are the SIF signal inputted to the Pin(21) of IC851?
No
Yes
Check TU61, IC31, SF11 and their periphery circuit,
and service it if defective.
Are the audio(L/R) signals inputted to the Pins(1,12) of
IC852?
No
Yes
Check IC851 and the periphery circuit,
and service it if defective.
Are the audio(L/R) signals outputted to the Pins(3,13)
of IC852?
No
Yes
Check IC852 and the periphery circuit,
and service it if defective.
Are the audio(L/R) signals outputted to the Pins(11,14)
of IC801?
No
Yes
Check SP801,SP802,JK801 and their periphery circuit,
and service it if defective.
Check IC801 and the periphery circuit,
and service it if defective.
Audio is not outputted normally. (Tuner input)
FLOW CHART NO.25
Are the DIF signals outputted to the Pins(11, 12)
of CN62?
No
Yes
Check the line between Pins(11, 12) of CN62 and
TU61, and service it defective.
Are the audio (L/R) signals outputted to the
Pin(15, 16) of CN62?
No
Yes
Replace DTV MODULE CBA UNIT.
Are the audio (L/R) signals inputted to the
Pins(5, 14) of IC852?
No
Yes
Check the line between Pins(5, 14) of IC852 and
CN62, and service it defective.
Are the audio (L/R) signals outputted to the
Pins(11, 14) of IC801?
No
Yes
Are the audio (L/R) signals outputted to the
Pins(3, 13) of IC852?
Check SP801, SP802, JK801 and their periphery
circuit, and service it if defective.
Yes
Check IC852 and the periphery circuit,
and service it if defective.
No
Check IC801 and the periphery circuit,
and service it if defective.
Audio is not outputted normally. (Tuner input (Digital))
FLOW CHART NO.26