Sharp LC-20VM2E Service Manual page 30

LC-20VM2E
Does not output from the front
YES
Is the pin 9 of Muted. Check
NO
the FSMUT line.
IC2001 in the
"L" state?
YES
Is output at pins Check IC308,
NO
1 and 7 of IC316 and their
IC316 normal?
peripherals.
YES
Check speaker
Is output at pins
YES
unit and its
10 and 17 of
peripheral parts.
IC305 normal?
NO
Is 13V applied to the pin 9 of IC305?
Check IC305 their peripherals.
No colour (AV1, AV2 and Component)
NO
Check peripherals.
Is output voltages
at pins 3 and 6 of
IC406, IC451
normal?
YES
Are these voltages Check IC801 and
NO
as follows of IC801 its peripheral
normal? parts.
pins 51 and 52
(input)
pins 41, 42 and
43 (output)
Does not output from the rear
YES
Is the pin 10 Muted. Check
NO
of IC2001 in the the RSMUT line.
"L" state?
YES
Is output at pin Check IC308,
NO
7 of IC304 IC304 and their
normal?
peripherals.
YES
Is output at pin
YES
14 of IC305
normal?
NO
NO
Check Q308,
F703 and their
YES
peripherals.
No colour appears
No colour (AV1, AV2)
Is output voltages
at pin 6 of IC407
normal?
YES
Is input voltages
at pin 13 of
IC801 normal?
YES
Is output voltages
at pins 5 and 6 of
IC801 normal?
YES
Check in/output
voltages of IC406.
No sound
Does not output from the headphones
YES
Is the pin 5
Check Q305,
NO
of IC2001 in the
J4001 and their
"L" state?
peripherals.
YES
Is output at pins Check IC317 and
NO
1 and 7 of their peripherals.
IC317 normal?
Check IC407 and
NO
its peripheral
parts.
NO
Check peripherals.
Check IC801 and
NO
its peripheral
parts.
30
Does not output from the line output
YES
Is the pin 24
of IC2001 in the
"L" state?
YES
Is output at pins
NO
1 and 7 of
IC314 normal?
No colour (Component)
Check in/output voltages of IC406.
LC-121M2E
LC-150M2E
Check the
NO
LSMUT line.
Check IC313,
IC314 and their
peripherals.