Touch Panel Abnormality - Sharp PN-L803C Service Manual

10. TOUCH PANEL ABNORMALITY

It is possible to touch with finger
but the pen is not functional.
No
Single touch is functional but
Multi touch is not functional.
No
Yes
The eraser is not recognized.
Several points are detected when
the eraser is placed on the monitor.
No
Touch position is shifted.
No
Whole screen cannot be
touched.
Some part cannot be touched.
Touch is detected without touching.
No
Yes
Yes
Yes
Check that the setting of touch is invalid.
No
Is the USB cable connected?
No
Are the Video output and the USB cabe connected to the
same place?
No
Does the PC detect the touch panel?
Yes
Is there any NG version firmware on the firmware version check
OSD menu?
No
Yes Are there any waterdrop, sebum or conductive dusts
on the screen?
No
ABRNOMALITY]
No
Are there any problem with the harnesses?
No
Are there any problem with the PWB?
No
Are there any opened or short-circuited sensors
by the Sensor check?
No
PN-L803C/80TC3 TROUBLESHOOTING 7 - 6
Yes
Yes
Yes
No
Yes
Yes
11. TOUCH PANEL
Yes
Yes
Yes
Refer to [11. TOUCH PEN ABNORMALITY].
Check that the Multi touch mode is valid.
* Note that the Windows Vista does not
support the Multi touc mode.
Check the OS of the PC.
Set the eraser setting to valid.
Perform the calibration.
Set the touch panel setting to valid.
Connect the USB cable.
The video output and the USB cable are
connected at the same place.
Replace the USB cable.
Clean the screen.
After cleaning the screen, turn OFF and ON
the monitor.
Connect the harness correctly.
Replace the harness.
Replace the PWB.
Replace the Touch panel unit.
Send the sensor check log to investigate the
cause of the problem.