Read Sharp LL-T15A3 (serv.man6) Service Manual online
LL-T15A3
TROUBLESHOOTING
4 – 2
Check the LCD control signal and
microprocessor control circuits around U1, X1,
U11, U8 and U9.
microprocessor control circuits around U1, X1,
U11, U8 and U9.
A
Screen does not operate normally.
Check RGB cable.
Defective
Replace RGB cable with
a new one.
a new one.
Check screen condition by changing display modes.
Reset the microprocessor to check if screen condition changes.
(Press and hold MENU and SELECT buttons while turning on power switch.)
(Press and hold MENU and SELECT buttons while turning on power switch.)
Screen stays in black.
Screen stays in white.
Screen jitters or on-screen
characters flicker.
characters flicker.
Abnormal color
Check the following signals
1) Check if module control signal is output.
2) J6 Nos. 57, 58, 59 and 60 pins signal
1) Check if module control signal is output.
2) J6 Nos. 57, 58, 59 and 60 pins signal
outputs show DC+5V?
Yes
No
Yes
No
Yes
No
CLOCK and PHASE
can be adjusted?
can be adjusted?
Does abnormal area move on
screen when BLACK LEVEL or
CONT is changed after H-POS
or V-POS is set?
screen when BLACK LEVEL or
CONT is changed after H-POS
or V-POS is set?
Switch PWB defective.
Main PWB defective.
LCD panel defective.
Cable defective.
Cable defective.
Display
