Service manual

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.
Check if the adjustment process menu of the microcomputer is set properly.
No No No No No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No S video pictures come out.
No
No
Yes
Yes
Yes
No Input 2 pictures come out.
No
Yes
No pictures come out (2/2).
No PC pictures come out.
No
No
No
Yes
Yes
Yes
No
Yes
Does the
test pattern
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.
Check
IC801 and
its
peripheral
circuitry.
Is the input
at pin (40)
of IC801
as
specified?
Check the
IC801 VIDEO
line and its
peripheral
parts.
Is the output
at pin (19) of
the tuner as
specified?
Are the
input and
output of
IC3401 as
specified?
Check
IC3401 and
its peripheral
parts.
Check the
power supply
line.
Check the
line in
question.
Check
IC3401 and
its peripheral
parts.
Check the
tuner and its
peripheral
parts.
Check the line
in question.
Check
IC3401 and
its peripheral
parts.
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?
Check the
line in
question.
Is the
output at
pin (43) of
IC3401 as
specified?
Is the input
at pin (1) of
IC3401 as
specified?
Check the
line in
question.
Check
IC3401 and
its peripheral
parts.
Is the input
at pin (8) of
IC3401 as
specified?
Is the
output at
pin (43) of
IC3401 as
specified?
No
No
Yes Yes
Yes
Is the input
at pin (40)
of IC801 as
specified?
Is the input
at pin (40)
of IC801 as
specified?
Check
IC801 and
its input
line and
peripheral
parts.
Check
IC801 and
its input
line and
peripheral
parts.
Check
IC801 and
its input
line and
peripheral
parts.
Are the inputs at pins
(3), (6) and (10) of
IC403 as specified?
Is the voltage 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
Yes
No
Yes
Check the output of IC801,
the input and output of
IC1201 and their
peripheral parts.
Are the
inputs at pins
(3) and (5) of
IC3401 as
specified?
Check the
SY line, SC
line and
peripheral
parts of
J3401.
Check the
lines and
peripheral
parts of
J3410.
Check
J3401 and
its
peripheral
parts.
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
Yes
Yes
Check the
lines and
peripheral
parts of
J3410.
Are the
inputs at
pins (1), (5)
and (25) of
IC3403 as
specified?
Check
IC3403 and
its
peripheral
parts.
Are the
outputs at
pins (11),
(14) and (17)
of IC3403 as
specified?
Check the input line
and its peripheral
parts.
Check Q401, Q402
and Q403.
Check the power
supply line.
Check the line in
question.
Check IC8701 and
its peripheral parts.
Check IC801 and
its peripheral parts.
No
Yes
No
Yes
Check the input line
and its peripheral
parts.
Check IC8701 and
its peripheral parts.
Check IC801 and its
peripheral parts.
No
Yes
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?
Check the output of IC801,
the input and output of
IC1201 and their
peripheral parts.
Check if the adjustment process menu of the microcomputer
is set properly.