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A
Screen stays in black.
Check the following signals
1) Check if module control signal (IC15) is output.
2) Check if gate voltage (5VLCD) is output
normally.
3) Check if Source voltage (3.3VLCD) is output
normally.
No
Main PWB defective.
USB is inoperative.
3.3 V output is generated?
(USB PWB IC1 3pin)
Yes
Clock is generated
(4 MHz: USB PWB IC3, pin 25)
Yes
RESET
(USB PWB IC3, pin 6) is High?
Yes
Data input
(USB PWB IC3, pins 7 and 8)?
Yes
Data output
(USB PWB IC3, pins 9, 10, 12,
and 13)?
Screen does not operate normally.
Check RGB cable.
Check DVI cable.
Normal
Check screen condition by changing display modes.
Reset the all adjustment to check if screen condition changes.
(Press and hold MENU and SELECT buttons while turning on power switch.)
Screen stays in white.
Yes
No
Check regulator
(USB PWB IC1)
and its peripheral circuits.
No
Check clock generator
(USB PWB X1)
and its peripheral circuits.
No
Check USB PWB R3, C203,
and D7.
No
Check the path from USB
PWB CN1 to IC3.
No
Check the path from USB
PWB IC3 to CN2.
Defective
Replace RGB cable or
DVI cable with a new
one.
Screen jitters or on-screen
characters flicker.
Does abnormal area move on
CLOCK and PHASE
can be adjusted?
screen when BLACK LEVEL or
CONT is changed after H-POS
or V-POS is set?
Yes
No
Switch PWB defective
4 – 2
LL-T1512W
Abnormal color
Yes
No
LCD panel defective.
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