LC-40/46/52/60LE820UN
7 – 12
No monitor audio output
Is the audio output from the monitor set at “VARIABLE” or “FIXED” on the menu screen?
YES
NO
Check IC3302 (CPU) and its peripheral circuits.
Are there the audio signal outputs at pins (M28) (HP/MONI_L) and (M27) (HP/MONI_R) of IC3302 (CPU)?
YES
NO
Check IC3302 (CPU) and its peripheral circuits.
Does the audio signal come from pins (M28) (HP/MONI_L) and (M27) (HP/MONI_R) of IC3302 to pins (2) (L) and (3) (R) of J504?
YES
NO
Check the line between IC3302 and J504 and their peripheral circuits.
Check the MUTE_A_AU and HP/MONI_MUTE lines and its peripheral circuits
(Q506, D527, 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 J9501?
(see fig-1, fig-2)
YES
Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
NO
Does the signal come to 12pin of IC9501?
(see fig-2) (IC9501: KSZ8041T)
YES
Check the line between J9501 and IC9501.
Check the LAN-jack J9501.
NO
Does the 3.3Vdc come to VDDA_3.3/VDDIO_3.3 of IC9501?
Does the 2.5Vdc come to VDD_1.8/VDDA_1.8 of IC9501?
NO
Check the power-circuits of D3.3V.
Check 7pin (V1.8_out) of IC9501.
YES
Does the clock signal come to 15pin of IC9501?
(25MHz, 3.3V)
NO
Check the line between X9501 and IC9501.
Check the crystal X9501. (SCA219WJ)
YES
Check IC9501 and its peripheral circuits.
LAN-jack J9501
fig-1
1pin
fig-2
