46
LC-20D30U
TROUBLE SHOOTING TABLE
(Continued)
No pictures come out (1/3).
All pictures do not come out.
No
TV pictures come out.
No Input 2 pictures come out.
No Input 3 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
Does the
test patter
n
of IC801
come out?
Are the
input and
output of
IC801 as
specified?
No
TV
, Input 2 or Input 3
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 (17) of
the tuner as
specified?
Are the
input and
output of
IC3402 as
specified?
Chec
k
IC3402 and
its per
ipher
al
par
ts
.
Chec
k the
po
w
er supply
line
.
Chec
k the
line in
question.
Chec
k
IC3402 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
IC3402 and
its per
ipher
al
par
ts
.
Are the
voltages at
pins (3), and
(15) of the
tuner as
specified?
Is the input
at pin (5) of
IC3402 as
specified?
Is the
output at
pin (7) of
IC3402 as
specified?
Chec
k the
line in
question.
Is the
output at
pin (7) of
IC3402 as
specified?
Is the input
at pin (1) of
IC3402 as
specified?
Chec
k the
line in
question.
Chec
k
IC3402 and
its per
ipher
al
par
ts
.
Is the input
at pin (3) of
IC3402 as
specified?
Is the
output at
pin (7) of
IC3402 as
specified?
No
No
Ye
s
Y
e
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
.
Chec
k the
SY line
, SC
line and
per
ipher
al
par
ts of
J3406.
Chec
k
J3406 and
its
per
ipher
al
par
ts
.
No
Are the
inputs at
pins (31)
and (40) of
IC801 as
specified?
No Input 1 pictures come out.
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 (15),
(17) , (18) and (20) of
IC8701 as specified?
Is the input of IC801 as
specified?
Chec
k the output of IC801,
the input and output of
IC1203 and their
per
ipher
al par
ts
.
Summary of Contents for Aquos LC 20D30U
Page 59: ...61 6 5 4 3 2 1 A B C D E F G H LC 20D30U SCHEMATIC DIAGRAM Ë R C LED Unit ...
Page 60: ...63 LC 20D30U 62 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 1 8 ...
Page 61: ...65 LC 20D30U 64 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 2 8 ...
Page 62: ...67 LC 20D30U 66 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 3 8 ...
Page 63: ...69 LC 20D30U 68 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 4 8 ...
Page 64: ...71 LC 20D30U 70 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 5 8 ...
Page 65: ...73 LC 20D30U 72 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 6 8 ...
Page 66: ...75 LC 20D30U 74 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 7 8 ...
Page 67: ...77 LC 20D30U 76 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 8 8 ...
Page 68: ...79 LC 20D30U 78 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 1 7 ...
Page 69: ...81 LC 20D30U 80 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 2 7 ...
Page 70: ...83 LC 20D30U 82 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 3 7 ...
Page 71: ...85 LC 20D30U 84 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 4 7 ...
Page 72: ...87 LC 20D30U 86 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 5 7 ...
Page 73: ...89 LC 20D30U 88 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 6 7 ...
Page 74: ...90 6 5 4 3 2 1 A B C D E F G H LC 20D30U ËSUB Unit 7 7 ...
Page 76: ...93 92 LC 20D30U 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H MAIN Unit Side A ...
Page 78: ...97 96 LC 20D30U 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H MAIN Unit Side B ...
Page 93: ...115 LC 20D30U PACKING OF THE SET S4 S2 X7 X4 X2 X3 S3 X1 X5 X6 S5 S3 S1 R L ...