23
LC-20B2UA
LC-20B2UB
TROUBLE SHOOTING TABLE
(Continued)
Chec
k all the settings on the microprocessor
’s adjust process men
u.
No picture
No picture
at all
Yes
No
Are inputs
and outputs
of IC801 as
specified?
Does the LCD
controller test
patter
n
appear?
Does the
video decoder
test patter
n
appear?
Chec
k IC402
and its
per
ipher
al
par
ts
.
Chec
k
IC1201, its
per
ipher
al
circuits and
the LCD
panel.
Chec
k IC801
and its
per
ipher
al
circuits
.
Yes
No
No
No VIDEO
1 or 2
output
Yes
No
Are inputs
and outputs
of IC402 as
specified?
Chec
k IC402
and its
per
ipher
al
par
ts
.
Chec
k
IC7001 and
its per
ipher
a
l
par
ts
.
No
Is input at Pin
(73) of IC801
as specified?
Chec
k
IC801,
A
V1 line and
their
per
ipher
al
par
ts
.
Yes
No
Are input and
output of
IC7001 as
specified?
Chec
k
IC7202 and
its per
ipher
a
l
par
ts
.
Yes
No
Are input and
output of
IC7202 as
specified?
No
Are pin
(67) of
IC2001
at
“H
”?
No S
VIDEO
output
Yes
Yes
Are pins (2)
and (12) of
IC7101 60th
at
“H
”?
No
Are inputs at
Pins (71) and
(72) of IC801
as specified?
Chec
k
SC3405, SY
line
, SC line
and per
ipher
al
par
ts
.
No
COMPONENT
output
No
Is input at
Pins (4), (5),
(6) and (75)
of IC801 as
specified?
Chec
k J3404,
D
VD-Y line
,
PB line
, PR
line and
per
ipher
al
par
ts
.
No TV
output
Yes
No
Are v
o
ltages
at Pins (6),
(7) and (9) of
tuner as
specified?
Chec
k the
po
w
e
r line
.
Yes
No
Is output at
Pin (19) of
tuner as
specified?
Chec
k the
tuner and its
per
ipher
al
par
ts
.
No
Is input at Pin
(3) of IC402
as specified?
Chec
k the
line in
question.
Yes
Chec
k IC402
and its
per
ipher
al
par
ts
.
Yes
No
Are Pins (2)
and (4) of
IC402 at
“H
”
and
“L
”
respectiv
ely?
Are Pins (65)
and (66) of
IC2001 at
“H
”
and
“L
”
respectiv
ely?
Yes
Chec
k the
line in
question.
Chec
k pin
(88) of
IC2001 or the
SSW line
.
Summary of Contents for Aquos LC 20B2UB
Page 27: ...27 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 INVERTER B Unit INVERTER A Unit ...
Page 31: ...31 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM ËCONTROL and RC LED Unit ...
Page 32: ...32 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 1 5 ...
Page 33: ...33 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 34: ...34 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 2 5 ...
Page 35: ...35 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 36: ...36 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 3 5 ...
Page 37: ...37 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 38: ...38 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 4 5 ...
Page 39: ...39 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 40: ...40 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë DIGITAL Unit 5 5 ...
Page 41: ...41 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 42: ...42 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë ANALOG Unit 1 2 ...
Page 43: ...43 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 44: ...44 LC 20B2UA LC 20B2UB 8 7 10 9 6 5 4 3 2 1 A B C D E F G H Ë ANALOG Unit 2 2 ...
Page 45: ...45 LC 20B2UA LC 20B2UB 17 16 19 18 15 14 13 12 11 10 ...
Page 46: ...46 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H Ë INVERTER A Unit ...
Page 47: ...47 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H Ë INVERTER B Unit ...
Page 49: ...49 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H DIGITAL Unit Side B CONTROL Unit Side B ...
Page 51: ...51 LC 20B2UA LC 20B2UB 6 5 4 3 2 1 A B C D E F G H ANALOG Unit Side A ...
