Sharp LC-30AA1H, Руководство по обслуживанию

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26
LC-30AA1M
LC-30AA1H
YES
NO
YES
YES
YES
NO
YES
NO NO
NO NO
Check if the internal/external
switching relay (RY3901)
functions correctly.
Is the output signal from the
1-bit amplifier applied to
P3903?
Perform checking around
IC2004, IC3804 and the
1-bit amplifier.
Are the MUTE circuits
(Q3804 and Q3805)
operating?
Is the audio signal applied to
pin (7) (L-IN) and pin (9) (R-
IN) of P3804?
Perform checking
around IC3803 and
IC3808.
Check for the AVC
System side for output.
Is the audio signal applied to
pin (13) and pin (20) of
SC2202 on the Monitor PWB?
Perform checking around Q2012 and
Q2014 and check the wire between
Monitor PWB and Audio PWB.
Check if 5V is supplied to the power
regulator circuit (IC3810, IC3812 and
IC3816) and pin (2) of P3804.
Is power supplied to each IC
on the AUDIO PWB?
Is the audio signal applied
to pin (13) and pin (15) of
P3803?
NO sound comes out. (Checking with the AVC
system connected)
YES
NO
NO
YES
YES
NO
YES
Check the connection of the high-voltage
(pin (2)) wire on the side of the blown
fuse and check that of the counterpart
high-voltage (pin (2)) wire of the
fluorescent lamp on the opposite side.
The backlight does NOt go on.
Is any of the fuses of
F6551-F6556
blown?
Is the control signal applied to
pin (8) (OFL1) and pin (9)
(OFL2) of P6564? Is the cord connected correctly
between the LCD Control PWB
and Inverter PWB?
Check the peripheral circuitry of
IC4501 of the LCD Control PWB
and check the operation of
Q7701 and Q7702.
Is power supplied to
Inverter PWB?
Check the Lamp error detection circuit on the Inverter-GND
PWB.
Check the 15V output on the
Power PWB.
Check the inverter
circuit downstream
from the blown fuse.