Sharp Aquos LC-22SV6U, Service Manual, Page: 33 / 118

33
LC-22SV6U
Do F701and F702 function?
Chec
k all the settings on the microprocessor
’s adjust process men
u.
Are secondar
y outputs
(+38V
, +9V
, +5V
, -8V) of
T3700 as specified?
Are the oscillation w
a
v
e
fo
rm
at T3700
’s pr
imar
y side as
specified?
Disconnect F701and F702. Is the load side shor
t-
circuited?
Is an
y of
T3700
’s pr
imar
y
side
, Q3704, Q3707 and
SW136 shor
t-circuited?
Chec
k J701, P701, P3703,
its per
ipher
al par
ts and
connection cab
le
.
Replace F701 and F702.
Chec
k SW136 and
connection cab
le
.
Chec
k the secondar
y-side
load of
T3700.
Does F6551, F6552, F6553 and F6554 function?
Is Pin (10) of IC4512 at
“H
”?
Are the oscillation w
a
v
e
fo
rms
at the pr
imar
y side of
T6551-
T6553 and
T6554 as
specified?
Replace F6551, F6552, F6553 and F6554.
Chec
k the line
, IC4512 and
its per
ipher
al par
ts
.
Chec
k Q6551, Q6552, Q6554,
Q6555, Q6557, Q6558, Q6560, Q6561,
T6551-T6554
and their per
ipher
al par
ts
.
Is an
y of Q6553, Q6556,
Q6559 and Q6562 shor
t-
circuited?
Chec
k the Q6553, Q6556,
Q6559, Q6562 and their per
ipher
al par
ts
.
Replace the fluorescent lamp and chec
k the oscillation
w
a
v
e
fo
rm
again.
No picture and sound
Yes
No
No Yes
No
Yes
No
Fluorescent lamp
Yes
No
Yes
No
Yes Yes
No
Yes
No
Yes
TROUBLE SHOOTING TABLE
(Continued)