Sharp Aquos LC-20S1M, Service Manual

Page: 20 / 76

20
LC-20S1M
TROUBLE SHOOTING TABLE
(Continued)
Do F3701 and F3301 function?
Check all the settings on the microprocessor
s adjust process menu.
Are secondary outputs (+31V
, +9V
, +5V
, -1
1V) of
T3701 as specified?
Are the oscillation waveform at
T3701
s primary side as
specified?
Disconnect F3701 and F3301. Is the load side short-circuited?
Is any of
T3701
s primary
side, Q3703 and S4053 short- circuited?
Check J3701, its peripheral parts and connection cable.
Replace F3701 and F3301.
Check S4053 and connection cable.
Check the secondary-side load of
T3701.
Do F6700, F6701, F6702, F6703 and F6704 function?
Is Pin (120) of IC1201 at
H
?
Are the oscillation waveforms at the primary side of
T6700,
T6701, T6702, T6703,
and
T6704 as specified?
Replace F6700, F6701, F6702, F6703 and F6704.
Check the line, IC1201 and its peripheral parts.
Check Q6700 - 6716,
T6700
- 6704 and their peripheral parts.
Replace the fluorescent lamp and check the oscillation waveform again.
Is input at Pin (72) of IC801 as specified?
Check SC341
1, SC3412, SC
line and peripheral parts.
Check all the settings on the microprocessor
s adjust process menu.
Is input at Pins (1), (2) and (3) of IC801 as specified?
Check J3404, PB line, PR line and peripheral parts.
No picture and sound
Yes
No
No Yes
Yes
No
Yes
No
Fluorescent lamp failure
Yes
No
Yes
No
Yes
No
Yes Yes
No colour
No
TV colour
No S-VIDEO colour
No VIDEO
colour
No COMPONENT colour
No
No