Read Sharp LL-T181A (serv.man11) Service Manual online
Abnormal screen
Check D-sub PWB.
Abnormal
Normal
Change the display mode and check the
screen condition.
screen condition.
Replace D-sub.
Screen remains
black.
black.
Screen remains
white
white
Screen jittering or characters
on screen flickering
on screen flickering
Abnormal color
Are PHASE, CLOCK
adjustable?
adjustable?
Yes
No
Set H-POS and V-POS so that an abnormal
area appears at the gradation part of the
pattern.
Does the abnormal area move when BRIGTH
or CONT is changed?
area appears at the gradation part of the
pattern.
Does the abnormal area move when BRIGTH
or CONT is changed?
Switch PWB defective
Main PWB defective
Replace LCD module.
2
Reset the microprocessor and check to see if the screen condition changes.
(Turn the power on, holding MENU and SELET buttons down.)
(Turn the power on, holding MENU and SELET buttons down.)
OSD adjustment PHASE,
CLOCK are normal?
(If not, adjust referring to
Instruction manual.)
CLOCK are normal?
(If not, adjust referring to
Instruction manual.)
Display the adjustment pattern
on the screen using the
adjustment FD.
Perform AUTO GAIN
CONTROL.
on the screen using the
adjustment FD.
Perform AUTO GAIN
CONTROL.
Check the following signals:
1 +12V power supply for LCD
(C91 +terminal)
2 +5V power supply for LCD
3 Clock signal
4 DE signal
For 2 3 4 , see a separate
drawing.
1 +12V power supply for LCD
(C91 +terminal)
2 +5V power supply for LCD
3 Clock signal
4 DE signal
For 2 3 4 , see a separate
drawing.
Yes
Yes
No
No
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