31
LC-20B8U-S
LC-20B9U-S
LC-20B9U-SM
TROUBLE SHOOTING TABLE
(Continued)
No pictures come out (1/2).
All pictures do not come out.
No
TV pictures come out.
No Input 3 pictures come out.
No Input 4 pictures come out.
Chec
k if the adjustment process men
u of the microcomputer is set proper
ly
.
No
No
No
No
No
No
No
No
No
No
No
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
No S video pictures come out.
No
No
Ye
s
Ye
s
Ye
s
No Input 2 pictures come out.
No
Ye
s
No pictures come out (2/2).
No PC pictures come out.
No
No
No
Ye
s
Ye
s
Ye
s
No
Ye
s
Does the
test patter
n
of the LCD
controller
come out?
Are the
input and
output of
IC801 as
specified?
No
TV
, Input 3 or Input 4
pictures come out.
Chec
k
IC801 and
its
per
ipher
al
circuitr
y.
Is the input
at pin (40)
of IC801
as
specified?
Chec
k the
IC801 VIDEO
line and its
per
ipher
al
par
ts
.
Is the output
at pin (19) of
the tuner as
specified?
Are the
input and
output of
IC3401 as
specified?
Chec
k
IC3401 and
its per
ipher
al
par
ts
.
Chec
k the
po
w
er supply
line
.
Chec
k the
line in
question.
Chec
k
IC3401 and
its per
ipher
al
par
ts
.
Chec
k the
tuner and its
per
ipher
al
par
ts
.
Chec
k the line
in question.
Chec
k
IC3401 and
its per
ipher
al
par
ts
.
Are the
voltages at
pins (6), (7)
and (9) of the
tuner as
specified?
Is the input
at pin (47)
of IC3401
as
specified?
Is the
output at
pin (43) of
IC3401 as
specified?
Chec
k the
line in
question.
Is the
output at
pin (43) of
IC3401 as
specified?
Is the input
at pin (1) of
IC3401 as
specified?
Chec
k the
line in
question.
Chec
k
IC3401 and
its per
ipher
al
par
ts
.
Is the input
at pin (8) of
IC3401 as
specified?
Is the
output at
pin (43) of
IC3401 as
specified?
No
No
Ye
s
Y
e
s
Ye
s
Is the input
at pin (40)
of IC801 as
specified?
Is the input
at pin (40)
of IC801 as
specified?
Chec
k
IC801 and
its input
line and
per
ipher
al
par
ts
.
Chec
k
IC801 and
its input
line and
per
ipher
al
par
ts
.
Chec
k
IC801 and
its input
line and
per
ipher
al
par
ts
.
Are the inputs at pins
(3), (6) and (10) of
IC403 as specified?
Is the v
oltage at pin (16)
of IC403 as specified?
Are the outputs at pins
(4), (7) and (9) of IC403
as specified?
Are the inputs at pins
(43), (48) and (54) of
IC8701 as specified?
Is the output of IC8701
as specified?
Is the input of IC801 as
specified?
No
Ye
s
No
Ye
s
Chec
k the output of IC801,
the input and output of
IC1201 and their
per
ipher
al par
ts
.
Are the
inputs at pins
(3) and (5) of
IC3401 as
specified?
Chec
k the
SY line
, SC
line and
per
ipher
al
par
ts of
J3401.
Chec
k the
lines and
per
ipher
al
par
ts of
J3410.
Chec
k
J3401 and
its
per
ipher
al
par
ts
.
Are the
outputs at
pins (43)
and (45) of
IC3401 as
specified?
No
Are the
inputs at
pins (31)
and (40) of
IC801 as
specified?
Are the
inputs at
pins (3),
(7) and
(27) of
IC3403 as
specified?
No Input 1 pictures come out.
No
No
Ye
s
Ye
s
Chec
k the
lines and
per
ipher
al
par
ts of
J3410.
Are the
inputs at
pins (1), (5)
and (25) of
IC3403 as
specified?
Chec
k
IC3403 and
its
per
ipher
al
par
ts
.
Are the
outputs at
pins (11),
(14) and (17)
of IC3403 as
specified?
Chec
k the input line
and its per
ipher
al
par
ts
.
Chec
k Q401, Q402
and Q403.
Chec
k the po
w
er
supply line
.
Chec
k the line in
question.
Chec
k IC8701 and
its per
ipher
al par
ts
.
Chec
k IC801 and
its per
ipher
al par
ts
.
No
Ye
s
No
Ye
s
Chec
k the input line
and its per
ipher
al
par
ts
.
Chec
k IC8701 and
its per
ipher
al par
ts
.
Chec
k IC801 and its
per
ipher
al par
ts
.
No
Ye
s
Is the output of IC8701
as specified?
Are the inputs at pins (5),
(13) and (20) of IC8701 as
specified?
Is the input of IC801 as
specified?
Chec
k the output of IC801,
the input and output of
IC1201 and their
per
ipher
al par
ts
.
Chec
k if the adjustment process men
u of the microcomputer
is set proper
ly
.
Содержание LC-20B8US
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