User Guide

CCS Technical Documentation BB Description & Troubleshooting
Company Confidential RH-4
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Touchpad faults
Is the touchpad
working?
No
Change TP Module.
Is the touchpad
working now?
Retest failing
TP Module
Yes
Measue Voltage of X+, X-.
Y+ and Y-.
VX+ & VX- = ~2.8V
VY+ & VY- = ~ 0 V
Check X305 (solder
joints). Is it OK?
Change X305No
Yes
No
Yes
Yes
N
o
Continue to trouble
shooting process for
Touchpad Controller (N306)
Check N306, L320, L321,
L322, L323, R330, C330,
C331, C332, and C333.
If not OK, change defect
part
End
No
Change TPM. Is the
EL working now?
Retest failing
TP Module
Yes
Check X305 (solder
joints). Is it OK?
Change X305No
Yes
No
Yes
Is the EL working?
End
Measure Voltage of VEL,
and ELEN (X305/17 & 18).
VEL & VELEN = ~2.8V
No
Check
VFLASH2
from UEM
(C204). If not
OK, change
UEM
Retest
Yes