Sharp LC-60LE920UN Service Manual page 58

LC-52LE920UN/LC-60LE920UN
I No monitor audio output I
[ Is the audio output from the monitor set at "VARIABLE" or "FIXED" on the menu screen? ]
NO
I Check IC3302 (CPU) and its peripheral circuits.
YES
I Are there the audio signal outputs at pins (M28) (HP/MONI_L) and (M27) (HP/MONI_R) of IC3302 (CPU)?
I
I
_' NO
I Check IC3302 (CPU) and its peripheral circuits.
YES
I 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?
I
I
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. ]
I No connect network I
Does the signal come to 1pin of LAN-jack J9501 ?
(see fig-l, fig-2)
NO
Does the signal come to 12pin of IC9501 ?
(see fig-2) (IC9501 : KSZS041T)
J' 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 ?
_' YES
Does the clock signal come to 15pin of IC9501 ?
(25MHz, 3.3V)
_' YES
I Check IC9501 and its peripheral circuits.
YES I Check the interface device and peripheral circuits.
I (power-LED of hub, LINK-LED of hub)
YES [ Check the line between J9501 and IC9501.
I Check the LAN-jack J9501.
NO I Check the power-circuits of D3.3V.
I Check 7pin (V1.8_out) of IC9501.
NO I Check the line between X9501 and IC9501.
I Check the crystal X9501. (SCA219WJ)
fig-1 LAN-jack J9501
t
1pin
fig-2
6-12