Read Sharp LC-30AD1E (serv.man8) Service Manual online
27
LC-30AD1E
YES
No
YES
YES
YES
No
YES
No
No
No
No
Check if the internal/external
switching relay (RY3901)
functions correctly.
switching relay (RY3901)
functions correctly.
Is the output signal from the
1-bit amplifier applied to
P3903?
1-bit amplifier applied to
P3903?
Perform checking around
IC2004, IC3804 and the 1-
bit amplifier.
IC2004, IC3804 and the 1-
bit amplifier.
Are the MUTE circuits
(Q3804 and Q3805)
operating?
(Q3804 and Q3805)
operating?
Is the audio signal applied to
pin (7) (L-IN) and pin (9) (R-
IN) of P3804?
pin (7) (L-IN) and pin (9) (R-
IN) of P3804?
Perform checking
around IC3803 and
IC3808.
around IC3803 and
IC3808.
Check for the AVC
System side for output.
System side for output.
Is the audio signal applied to
pin (13) and pin (20) of
SC2202 on the Monitor PWB?
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.
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.
regulator circuit (IC3810, IC3812 and
IC3816) and pin (2) of P3804.
Is power supplied to each IC
on the AUDIO PWB?
on the AUDIO PWB?
Is the audio signal applied
to pin (13) and pin (15) of
P3803?
to pin (13) and pin (15) of
P3803?
YES
YES
YES
No
Check the input/output
voltage of IC4103.
voltage of IC4103.
Perform checking around Q4102 and IC4101.
Is the voltage of emitter side of
Q4102 about 6V?
Q4102 about 6V?
The whole screen is whitish (LCD power supply)
Check the power supplies.
Check the power supplies to
SC4101 and SC4102 in particular.
Check the power supplies to
SC4101 and SC4102 in particular.
Remove the FFCs attached to SC4101
and SC4601- SC4604 (because the
panel may be broken).
and SC4601- SC4604 (because the
panel may be broken).
