Read Sharp LL-T1803 (serv.man14) Service Manual online
LL-T1803-E/P
TROUBLESHOOTING
5 – 2
A
2
Display abnormality
Check the analog cable and the digital cable.
Change the display mode and check the
display conditions.
Execute the microcomputer reset, and check that the display is changed.
(Press and hold the MENU button and the SELECT button,
and press the POWER SW.)
Normal
Normal
Abnormal
Abnormal
Normal
Abnormal
Normal
Abnormal
Replace the analog and
the digital cables.
The display
remains black.
The display
remains white.
The display flickers.
The text display flickers.
Abnormal colors
Check the following signals.
Is the module control outputted ?
Check the LCD control signal at U10, U11,
U12, U8, and U13, and the microcomputer
control circuit peripheral for any abnormality.
Is the module control outputted ?
Check the LCD control signal at U10, U11,
U12, U8, and U13, and the microcomputer
control circuit peripheral for any abnormality.
Digital
Analog
Can CLOCK and
PHASE be adjusted?
When set to H-POS and V-POS,
if the BLACK LEVEL or CONT
is changed,
dose the abnormal section move
on the display?
Switch PWB
abnormality
Main PWB abnormality
LCD panel abnormality
Cable abnormality
Display
