Sharp LC-13C3US, Service Manual

Page: 30 / 88

30
LC-13C3U-S
LC-15C3U-S
TROUBLE SHOOTING TABLE
(Continued)
No picture and sound
Yes
No
Do F3701and F3702 function?
Chec
k all the settings on the microprocessor
’s adjust process men
u
.
No
Are secondar
y outputs
(+34V
, +9V
, +5V
, -7V
, -20V)
of
T3701 as specified?
Yes
Are the oscillation w
a
v
e
fo
rm
at T3701
’s pr
imar
y side as
specified?
Yes
No
Disconnect F3701and F3702.
Is the load side
shor
t-circuited?
Yes
No
Is an
y of
T3701
’s pr
imar
y
side
, Q3700 and S4701 shor
t-
circuited?
Chec
k J3701, its per
ipher
al
par
ts and connection cab
le
.
Replace F3701 and F3702.
Chec
k S4701 and
connection cab
le
.
Chec
k the secondar
y-side
load of
T3701.
Fluorescent lamp
Yes
No
Does F6700, F6701, F6702, F6703, and F6704 function?
Yes
No
Is Pin (34) of IC1201 at
“H
”?
Yes
No
Are the oscillation w
a
v
e
fo
rm
s
at the pr
imar
y side of
T6700,
T6702, T6704, T6706,
and
T6708 as specified?
Yes
Replace F6700, F6701, F6702, F6703, and F6704.
Yes
Chec
k
the line
, IC1201 and
its per
ipher
al par
ts
.
Check Q6700 - 6714,
T6700
- 6709 and their peripheral parts.
Replace the fluorescent lamp and chec
k the oscillation
w
a
v
e
fo
rm
again.