Sharp LC-19SK25U Service Manual page 47

TROUBLESHOOTING TABLE (Continued)
<<INPUT-1>>
Is L-ch audio signal fed from input terminal J501 to pin 12 of IC501?
Is R-ch audio signal fed from input terminal J501 to pin 12 of IC502?
<<INPUT-2>>
Is L-ch audio signal fed from input terminal J502 to pin 14 of IC501?
Is R-ch audio signal fed from input terminal J502 to pin 14 of IC502?
<<HDMI>>[INPUT-3]
Is L-ch audio signal fed from input terminal J503 to pin 1 of IC501?
Is R-ch audio signal fed from input terminal J503 to pin 1 of IC502?
<<PC>>[INPUT-4]
Is L-ch audio signal fed from input terminal J401 to pin 5 of IC501?
Is R-ch audio signal fed from input terminal J401 to pin 5 of IC502?
Yes
Are audio signals from pin 3 of IC501 and IC502 to pins 10 and 12 of
IC302 normal?
Yes
Is audio input from pin 4 of IC302 to pin W6 of IC801 normal?
Yes
Is audiio output from IC1302 normal?
Yes
Check the connector (P1301) of SUB_UNIT and around the speakers
No audio output from external input
No
No
No
47
Check the circuits between IC501/IC502 and IC302.
Check the Circuits between IC302 and IC801.
Check IC1302 and peripheral circuits.
LC-19SK25U/U-W
LC-19SB25U/U-W
LC-19SB15U
LC-19D45U