Sharp Aquos LC-20B4M, Руководство по обслуживанию

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20
LC-20B4M
TROUBLE SHOOTING TABLE
(Continued)
Do F3701 and F3702 function?
Check all the settings on the microprocessor
’s adjust process menu.
Are secondary outputs (+38V
, +9V
, +5V
, -1
1V) of
T3701 as specified?
Are the oscillation waveform at T3701
’s primary side as
specified?
Disconnect F3701 and F3702. Is the load side short-circuited?
Is any of
T3701
’s primary
side, Q3703 and S4701 short- circuited?
Check J3701, its peripheral parts and connection cable.
Replace F3701 and F3702.
Check S4701 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,
T6702, T6704, T6706,
and
T6708 as specified?
Replace F6700, F6701, F6702, F6703, and F6704.
Check the line, IC1201 and its peripheral parts.
Check Q6700 - 6714,
T6700
- 6709 and their peripheral parts.
Replace the fluorescent lamp and check the oscillation waveform again.
Is input at Pin (72) of IC801 as specified?
Chec
k SC3405, SC line and
per
ipher
al par
ts
.
Chec
k all the settings on the microprocessor
’s adjust process men
u.
Is input at Pins (1) and (3) of IC801 as specified?
Chec
k J3404, PB line
, PR line
and per
ipher
al par
ts
.
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