Sharp LC-32LE700UN Service Manual page 67

Is the audio output from the monitor set at "VARIABLE" or "FIXED" on the menu screen?
YES
Are there the audio signal outputs at pins (N27) (PGA1OUT_L) and (N28) (PGA1OUT_R) of IC8001 (CPU)?
YES
Does the audio signal come from pins (N27) (PGA1OUT_L) and (N28) (PGA1OUT_R) of IC8001 to pins (2) (L) and (4) (R) of J505?
YES
Check the connector (J505) and their peripheral circuits, and speakers and the Cable.
Does the signal come to 1pin of LAN-jack J9501?
(see fig-1, fig-2)
Does the signal come to 2pin of IC9501?
(see fig-2) (IC9501: KSZ8041T)
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?
Does the clock signal come to 15pin of IC9501?
(25MHz, 3.3V)
Check IC9501 and its peripheral circuits.
fig-1
No monitor audio output
Check IC8001 (CPU) and its peripheral circuits.
Check IC8001 (CPU) and its peripheral circuits.
Check the line between IC8001 and J505 and their peripheral circuits.
Check the LINE_MUTE line and its peripheral circuits (Q1311, etc.).
No connect network (Except for LC-32LE700UN)
NO
NO
YES
YES
LAN-jack J9501
1pin
NO
NO
NO
YES Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
YES Check the line between J9501 and IC9501.
Check the LAN-jack J9501.
NO Check the power-circuits of D3.3V.
Check 7pin (V1.8_out) of IC9501.
NO Check the line between X9501 and IC9501.
Check the crystal X9501. (SCA219WJ)
fig-2
6 – 14
LC-32/40/46/52LE700UN