Sharp 60LE920UN, 52LE920UN service manual Hp/Monir, No connect Network

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)?
	_' 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?
	_' 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
YES	(Q506,	D527, etc.).

I I

I I

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 ?	YES	I Check the interface	device and peripheral circuits.
(see fig-l, fig-2)				I (power-LED of hub, LINK-LED of hub)

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	[ 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 fig-2

t

1pin

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