Read Sharp LL-T15G4 Service Manual online
LL-T15G4-H/LL-T15G4-B
TROUBLESHOOTING
4 – 2
A
Screen does not operate normally.
Check RGB/DVI cable.
Defective
Normal
Replace RGB/DVI cable
with a new one.
with a new one.
Check screen condition by changing display modes.
Reset all 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
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.
Check the following signals
1) Check if module control signal is output (U1).
2) Is the VCC3.3, VCC2.5 of U1 turned on?
3) CLK, RX0, RX1, RX2 and RX3 are normal?
4) Is the power supply of PWR_DWM turned on?
(32P of U5)
1) Check if module control signal is output (U1).
2) Is the VCC3.3, VCC2.5 of U1 turned on?
3) CLK, RX0, RX1, RX2 and RX3 are normal?
4) Is the power supply of PWR_DWM turned on?
(32P of U5)
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