21
LC-20SH4U
SUPPLEMENT
TROUBLE SHOOTING TABLE
(Continued)
No video output
No
No
No
No
Are the input and
output of IC1004
as specified?
Chec
k IC1004
and its per
ipher
al
circuits
.
Chec
k the po
w
er
line
.
Chec
k the
related line
.
Chec
k the
related line
.
Is the input at pin
(24) of S ter
minal
detector IC2003
as specified?
Are the inputs at pins (21),
(33) and (44) of IC1004 as
specified?
Chec
k the D-Y
, D-PB and
D-PR lines of SC2001.
Chec
k IC1004
and its per
ipher
al
circuits
.
Is the input at pin
(24) of S ter
minal
detector IC2003
as specified?
No
Is the input at pin
(40) of IC1004 as
specified?
Are the v
oltages
at pins (6), (7)
and (9) of tuner
as specified?
No ima
g
e at all
Chec
k the microprocessor's adjustment process men
u
f
or wrong settings
.
No
TV output
No
Video 1 output
No S
Video output
No Component output
Chec
k the LCD
panel v
oltage
and w
a
v
e
fo
rm
.
Yes
Yes
Chec
k the
related line
.
Yes
Chec
k IC1004
and its per
ipher
al
circuits
.
No
Are the inputs at
pins (31) and
(42) of IC1004 as
specified?
Yes
Chec
k the
related line
.
Yes
Yes
No
Chec
k the tuner
and its per
ipher
al
circuits
.
Is the output at
pin (19) of tuner
as specified?
Yes
Chec
k the
related line
.
Summary of Contents for LC-20SH4U
Page 25: ...27 LC 20SH4U SUPPLEMENT 26 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H OVERALL WIRING DIAGRAM ...
Page 26: ...29 LC 20SH4U SUPPLEMENT 28 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 1 5 ...
Page 27: ...31 LC 20SH4U SUPPLEMENT 30 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 2 5 ...
Page 28: ...33 LC 20SH4U SUPPLEMENT 32 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 3 5 ...
Page 29: ...35 LC 20SH4U SUPPLEMENT 34 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 4 5 ...
Page 30: ...37 LC 20SH4U SUPPLEMENT 36 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 5 5 ...
Page 31: ...39 LC 20SH4U SUPPLEMENT 38 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 1 4 ...
Page 33: ...43 LC 20SH4U SUPPLEMENT 42 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 4 4 ...
Page 34: ...44 6 5 4 3 2 1 A B C D E F G H LC 20SH4U SUPPLEMENT ËR C LED Unit ...
Page 36: ...47 LC 20SH4U SUPPLEMENT 46 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 38: ...51 LC 20SH4U SUPPLEMENT 50 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 40: ...55 LC 20SH4U SUPPLEMENT 54 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SUB Unit Wiring Side ...
Page 53: ...69 LC 20SH4U SUPPLEMENT PACKING OF THE SET X3 X4 X5 X6 X2 X1 S2 S4 S3 S3 S5 S3 S3 S6 S1 X7 ...
