Sharp Aquos LC 15B2UA, Service Manual

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26
LC-15B2UA
LC-15B2UB
TROUBLE SHOOTING TABLE
(Continued)
No picture and sound
No color
No TV
color
No S-VIDEO color
Yes
No
Do F3701 function?
Check all the settings on the microprocessor
s
adjust process menu.
No
Are secondary outputs (+38V
, +9V
, +5V
, -8V
, -20V)
of
T3701 as specified?
Yes
Are the oscillation waveform at
T3701
s primary side as
specified?
Yes
No
Disconnect F3701. Is the load side short- circuited?
Yes
No
Is any of
T3701
s
primary
side, Q3700 and S4701 short- circuited?
Check J3701, its peripheral parts and connection cable.
Replace F3701.
Check S4701 and connection cable.
Check the secondary-side load of
T3701.
Fluorescent lamp
failure
Yes
No
Does F6500 and F6501 function?
Yes
No
Is pin (34) of IC1201 at
H
?
Yes
No
Are the oscillation waveforms at the primary side of
T6500
and
T6502 as specified?
Yes
Replace F6500 and F6501.
No
Is input at Pin (71) of IC801 as specified? Check SC3405, SC line and their peripheral parts.
Yes
Check the line, IC1201 and its peripheral parts.
Check D6500, Q6500~Q6505, T6500~T6503 and their peripheral parts.
Replace the fluorescent lamp and check the oscillation waveform again.
No VIDEO
color
Check all the settings on the microprocessor
s
adjust process menu.
No COMPONENT color
No
Is input at Pins (4) and (6) of IC801 as specified?
Check J3404, PB line, PR line and their peripheral parts.