Table of Contents
Advertisement
8.7 Touch Screen Function Failure
Symptom:
Touch Screen Function is not working property when using Touch Pen on the Touch Screen.
Touch Screen
Touch Screen
Function Test Error
Function Test Error
Is the
Touch Screen Cable
Connected
well?
Yes
Yes
Try another known good
Try another known good
Touch Screen Module
And Test again
And Test again
Ok
Ok
?
?
No
No
Replace
Replace
Motherboard
Motherboard
Barracuda PDA Maintenance
No
No
Re-connect
It Well
Replace the
Yes
Yes
Faulty
Touch Screen
Module
Board-
Board
Troubleshooting
Troubleshooting
Check the following parts for cold solder or one of the following parts on
the mother-board may be defective, use an oscilloscope to check the
following signal or replace the parts one at a time and test after each
replacement.
Parts:
J5
C64
L2
C65
L3
C66
L4
C67
L5
C177
U42
U3
-
level
level
Signals:
VCC3
VREF_1.25V
TSPY
TSMX
TSMY
TSPX
UCB_IRQ
SFRM_C
RXD_C
SCLK_C
TXD_C
136
Advertisement
Table of Contents
