Sharp LC-15PX1U, Service Manual

Page: 21 / 104

LC-15PX1U
21
TROUBLE SHOOTING TABLE
(Continued)
NO NO NO
YES YES YES
NO NO NO NO
YES YES YES YES
NO
YES
NO
YES
NO NO
YES
No video output (1/2)
Mak
e sure that the microprocessor's adjustment process and men
u settings are all as specified.
No ima
g
es at all
Does the IC1201 test patter
n
appear?
Chec
k IC1201 and its
per
ipher
al circuits
.
Chec
k also the LCD
panel v
oltage and
wav
ef
or
m
.
Are the input and output of IC3401 as specified?
Chec
k IC3401
and its per
ipher
al
circuits
.
Is the input of IC8801 as specified?
Chec
k the signal
input line of IC8801.
Are the v
oltages at
pins (6), (7) and (9) of tuner as specified?
Chec
k the
voltage line
.
Is the output at pin (19) of tuner as specified?
Chec
k the tuner
and its per
ipher
al
circuits
.
Is the input at pin (1) of IC3401 as specified?
Chec
k the line
in question.
Is the output of IC3401 as specified?
Chec
k IC3401
and its per
ipher
al
circuits
.
Is the input at pin (23) of IC3401 as specified?
Chec
k the line
in question.
Is the output of IC3401 as specified?
Chec
k IC3401 and
its per
ipher
al
circuits
.
Is the input at pin (47) of IC3401 as specified?
Chec
k the line
in question.
Is the output of IC3401 as specified?
Chec
k the line
in question.
Chec
k IC3401
and its per
ipher
al
circuits
.
Does the card circuit test patter
n appear?
Chec
k IC8501 and
its per
ipher
al
circuits
. Chec
k also
the card circuit.
Does the IC8801 test patter
n appear?
Chec
k the signal
input line of IC8801.
Chec
k IC8801 and its
per
ipher
al circuits
.
Chec
k also the card
circuit signal input.
No
TV
, A
V1 and A
V2 ima
g
e
s
No
TV ima
g
e
s
No A
V1 ima
g
e
s
No A
V2 ima
g
e
s
*1 thr
u
*3:
Getting the test patter
ns
displa
yed is ref
e
rred to on the ne
xt page
.
*1 *2 *3