Sharp LC-20C2E (serv.man4) Service Manual ▷ View online
18
LC-20C2E
TROUBLE SHOOTING TABLE
(Continued)
No sound
Check all the settins microprocessor's adjust process menu.
Is the pin 53 of
IC2001 in the
"L" state?
Is output at pins
26 and 27 of
IC901 normal?
Is output at pins
1 and 7 of
IC903 normal?
Yes
Yes
No
No
No
No
No
No sound
from front
speakers
Is output at pins
1 and 7 of
IC303 normal?
Yes
Is output at pins
8 and 12 of
IC3305 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and their
peripheral parts.
Check IC903
and their
peripheral parts.
Check IC303
and their
peripheral parts.
Check IC3305
and their
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is the pin 53 of
IC2001 in the
"L" state?
Is output at pins
26 and 27 of
IC901 normal?
Is output at pins
1 and 7 of
IC903 normal?
Yes
Yes
No
No
No
No
No
No
Is output at pins
1 and 7 of
IC303 normal?
Yes
Is output at pins
8 and 12 of
IC3305 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and their
peripheral parts.
Check IC903
and their
peripheral parts.
Check IC303
and their
peripheral parts.
Check IC3305
and their
peripheral parts.
Yes
Is output at
Q301 normal?
Check Q301
connection
cable.
No sound
from
headphone
TV sound
failure
Is output at pins
37 and 38 of
IC901 normal?
Is output at pins
1 and 7 of
IC902 normal?
Check IC901
and their
peripheral parts.
Check IC902
and their
peripheral parts.
Yes
No
No
No
No sound
from output
line
Is output at pin
1 of W7 tuner
normal?
Is input at pin
67 of IC901
normal?
Check the tuner
and their
peripheral parts.
Check IC901,
MONOS/SIF
line and their
peripheral parts.
Yes
No
19
LC-20C2E
1
2
3
4
5
6
7
8
9
10
A
B
C
D
E
F
G
H
I
J
CHASSIS LAYOUT
INVERTER A Unit
INVERTER B Unit
20
LC-20C2E
1
2
3
4
5
6
7
8
9
10
A
B
C
D
E
F
G
H
I
J
MAIN Unit (Side-A)
MAIN Unit (Side-B)
21
LC-20C2E
1
2
3
4
5
6
7
8
9
10
A
B
C
D
E
F
G
H
I
J
SWITCH Unit
VIDEO Unit
S-OUT Unit
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