Sharp LC-20E1E (serv.man9) Service Manual ▷ View online
17
LC-20E1E
TROUBLE SHOOTING TABLE
(Continued)
No picture
(3/3)
Colour is unusual
No picture image inversion
Gradation defect
Check all the settings microprocessor's adjust process menu.
Is output of
Check R1202
Is in/output of
Check R1209
Is output V0,V7,
V17,V21,V32,
V64,V122,V176,
V235,and V255
normal?
Check IC1106~
IC1108, IC1114
IC1115 and their
R0~R7
NoNo
and its
SPIO and
NoNo
NoNo
and its
normal?
normal?
normal?
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
SPIO normal?
Yes
Is output of
Is output of
Check R1204
Is output of U/D
Check IC
1206
G0~G7
Yes
B0~B7
No
NoNo
and its
normal?
NoNo
IC1207,Q1201
and their
Check R1203
and its
Yes
18
LC-20E1E
TROUBLE SHOOTING TABLE
(Continued)
No sound
(1/2)
No sound from front speakers
No sound from headphone
No sound from
output line
Check all the settings microprocessor's adjust process menu.
Is the pin 53 of IC2001
Muting effect is on.
Is the pin 52 of IC2001
Muting effect is on.
Is output at pins 33
Check IC1901 and
its
in the "L" state?
No
Check the FSMUTE
in the "L" state?
No
Check the HP_MUTE
and 34 of IC1901
No
peripheral parts.
Yes
Yes
Yes
Yes
l
ine.
line.
normal?
Yes
Is output at pins 27 and
Check IC1901 and its
Is output at pin
s 24 and
Check IC1901 and its
Is output at pins 1 and
Check IC3500 and its
28 of IC1901 normal?
No
peripheral parts.
25 of IC1901 normal?
No
peripheral parts.
7 of IC3500 normal?
No
peripheral parts.
Yes
Yes
Is output at pins 1 and
Check IC1903 and its
Is output at pins
1 and
Check IC304 and its
7 of IC1903 normal?
No
peripheral parts.
7 of IC304 normal?
No
peripheral parts.
Ye
s
Is output at pins 8 and
Check IC3305 and its
Check headphone jack
12 of IC3305 normal?
No
peripheral parts.
and connection cable.
Check front speakers
and connection cable.
19
LC-20E1E
TROUBLE SHOOTING TABLE
(Continued)
No sound
(2/2)
No sound from SCART
SCART sound failure
TV sound failure
Check all the settings microprocessor's adjust process menu.
Is output at pins 36 and
Check IC1901 and its
Is input at pins
53 and
Check theire lines and
Is output at pin 11
Check the tune
r and
37 of IC1901 normal?
No
peripheral parts.
54 of IC1901 normal?
No
theire peripheral parts.
of tuner normal?
No
its peripheral parts.
Yes
Is output at pins 1 and
Check IC1902 and its
Is output at pins
27 and
Check IC1901 and its
Is input at pins 67 and
Check IC19
01 and its
7 of IC1902 normal?
No
peripheral parts.
28 of IC1901 normal?
No
peripheral parts.
69 of IC1901 normal?
No
peripheral parts.
Yes
Yes
21
LC-20E1E
20
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
INVERTER-A Unit
INVERTER-B Unit
CHASSIS LAYOUT
MAIN Unit
TUNER Unit
R/C RECEIVER Unit
OPERATION Unit
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