C903
1228-1147 rev. 1
TROUBLESHOOTING
T
R
O
UBL
ESHOOT
ING
N avigation Keypad LED Problems
START
Load ETS SW into the Phone
Use TRS Fixture
Remove the Dome Foil Navi PBA and Light Block Navi
PBA from the Navigation PBA
Use the TRS Fixture Display Holder and Connect
Navigation PBA and Main Flex Assy to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Navigation Keypad
Replace
X4202
Yes
Are all
Navigation PBA
LEDs On
(except V8450)
Yes
Are
all WHITE LEDs
Ok
No
SL 4 Replace
X4202
SL 5 Replace
N2000
No
Are the
BLUE LEDs
Ok
Yes
Check the following WHITE LEDs:
V8420, V8421, V8422, V8423
V8424, V8425, V8426 and V8427
Check the following BLUE LEDs:
V8431, V8434,
V8440, V8441, V8442 and V8443
Replace
Main Flex Assy or
Navigation PBA
Assy
Yes
3.8 Volt DC
at MP 55
(N4240_Pin 3)
No
No
Yes
Replace
N4240 or N2410
No
1:
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Deactivate:
Navigation Keypad
2:
Disconnect VBATT and DCIO/SEPI and
Remove the TRS Fixture Display Holder
3:
Connect VBATT and DCIO/SEPI
Go to
Navigation Keypad
LED Problems part 2
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Activate:
Navigation Keypad
0 Volt DC
at MP 55
(N4240_Pin 3)
SL 4 Replace
N4240
SL 5 Replace
N2000
Navigation Keypad LED Problems part 1
START
Note!
Before following this guide
the Navigation Keypad Problems part 1
TRS guide must be finished.
Replace
Main Flex Assy or
Navigation PBA
Assy
1:
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Deactivate:
CleraKey BLUE LED
2:
Disconnect VBATT and DCIO/SEPI and
Remove the TRS Fixture Display Holder
3:
Connect VBATT and DCIO/SEPI
4:
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Activate:
CleraKey BLUE LED
1:
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Deactivate:
Navigation Keypad
2: Activate:
CleraKey BLUE LED
Is V8450
”C” Key BLUE LED
Ok
Yes
1.8 Volt DC
at MP54
(N4240_Pin 1)
No
Replace
N2410
No
Replace
N4240 or X4202
Yes
Navigation Keypad LED Problems part 2
SEMC Troubleshooting Manual
15
(129)