Sharp 4T-C70AH1X - No Audio Heard

4T-C6070AH1X
6 – 5
Noaudio heard(2)
No external audioheard
IstheretheL-chaudiosignalinputfrompin(6)ofinputterminal
J502topin(46)ofIC3301?
IstheretheR-chaudiosignalinputfrompin(3)ofinputterminal
J502topin(
47
)ofI
C3301?
YES
IstheretheI2Ssignaloutputatpin(72,159,160,161)ofIC3301? CheckIC3301andits peripheralcircuits.
YES
ON
?2071CIfo
5,6,7,8)(niptatupnilangiserehtsI Checkconnection betweenIC3301andIC1702anditsperiph-
eralcircuits.
YES
IstheL-chaudiosignal outputatpin(26),(27),(30),(31)of
IC1702normal?
  NO CheckIC1702andits peripheralcircuits.
IstheR-ch audio signaloutputatpin(10), (11),(14),(15)of
IC1702normal?
YES
Are theaudiosignalL-chand R-choutputat(3)/(4) and(1)/(2)of
P1701 normal?
NO CheckcircuitbetweenIC1702 &P1701.
YES
Checkspeakers andtheirperipheralcircuits.
<INPUT3>
NO
I
2
S