Sharp LC-32LE250M Service Manual page 22

LC-32LE250M
No external audio heard
<INPUT 2>
Is there the L-ch audio signal input from pin (30) of input terminal
TL563 to pin (26) of IC 3301?
Is there the R-ch audio signal input from pin (26) of input terminal
TL563 to pin(27) of 3301?
<INPUT 3>
Is there the L-ch audio signal input from pin (20) of input terminal
TL539 to pin (23) of 3301?
Is there the R-ch audio signal input from pin (15) of input terminal
TL539 to pin (24) of IC3301?
Is there the I2C signal input at pin (42), (43) of IC3301?
Is there audio signal input at pin(22),(32) of IC1702?
Is the L-ch audio signal output at pin(10),(11),(16),(17) of
IC1702
Is the R- ch audio signal output at pin(2),(3),(8),(9) of IC1702
normal ?
Are the audio signal L-ch and R-ch output at (3)/(4) and (1)/(2) of
P1702 normal?
Check speakers and their peripheral circuits.
No audio heard (2)
YES
YES
YES
YES
YES
7 – 5
NO Check IC3301 and its peripheral circuits.
NO Check connection between IC3301 and IC1702 and its periph-
eral circuits.
NO Check IC1702 and its peripheral circuits.
NO Check circuit between IC1702 & P1702 .