LC-90LE740X
6 – 22
No monitor audio output
Are there the audio signal outputs at pins (AN34) (HP_MONITOR_L) and (AN3532) (HP_MONITOR_R) of IC3301 (CPU)?
YES
NO
Check IC3301 (CPU) and its peripheral circuits.
Does the audio signal come from pins (2) (MONI_HP_L) and (11) (MONI_HP_R) of IC1702 (Line-out Amplifier) to pins (3) (L) and (2) (R) of J504?
YES
NO
Check the line between IC1702 and J504 and their peripheral circuits.
Check the LINE_MUTE line and its peripheral circuits(Q506/Q510, etc).
Check the connector (J504) and their peripheral circuits, and speakers and the Cable.
No connect network
Does the signal come to 1pin of LAN-JACK J9401?
(see fig-1, fig-2)
NO Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
YES
Does the signal come to AT18 pin of IC3301?
(see fig-2)
NO Check the line between J9401 and IC3301.
Check the LAN-JACK J9401.
YES
Check IC3301 and its peripheral circuits.
LAN-jack J9501fig-1
1pin
fig-2
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