C905
1222-9526 rev. 1
TROUBLESHOOTING
Navigation Keypad LED Problems
TROU
B
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E
S
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OTIN
G
- Auto Focus LED Problems
Replace
X4200
START
Load ITP SW into the Phone
Use TRS Fixture
Connect: PBA Key Flex Flip and Slider FPC 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:
Keypad LED
If Navigation Keypad LED is working on the TRS Fixture
then Replace
PBA Key Flex Flip or Slider FPC Assy
If not then continue with the
Navigation Keypad LED Problems TRS guide
1:
Cut the Shield Can Fence around the N4000, be very careful
to avoid component damage.
2:
Use TRS Fixture
Connect: PBA Key Flex Flip and Slider FPC Assy to the PBA
Connect: VBATT and DCIO/SEPI
3:
Restart the Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Keypad LED
Disconnect:
VBATT and DCIO/SEPI
Remove the PBA from the TRS Fixture
Max 1 Ohm
between MP 74
(R4401) and MP 72
(C4401)
SL 5 Replace
L4400
SL 4 Escalate
No
Yes
5 Volt DC at
MP 56 (TP4400)
No
Replace
N4400
Yes
1.7V – 3V DC at
MP 78 (R4403), MP 77
(R4404), MP 75 (R4405)
and MP 79 (R4406)
No
Yes
Navigation Keypad LED Problems
1.4V - 1.5V DC
at MP 93 (TP4401)
when Auto Focus LED
is Activated
No
Yes
Replace
N4400
5 Volt DC at
MP 56 (TP4400) when
Auto Focus LED is
Activated
Yes
No
Is the
Problem solved
SL 5 Replace
N2010
SL 4 Escalate
No
Replace
X4400
Yes
Connect: VBATT and DCIO/SEPI
Connect: Flash Complete to the PBA
Restart the Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Auto Focus LED
START
Load ITP SW into the Phone
Use TRS Fixture
Connect: Flash Complete to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Auto Focus LED
If Auto Focus LED is working on the TRS Fixture
then Replace Flash Complete
If not then continue with the
Auto Focus LED Problems TRS guide
Max 1 Ohm
between MP 74
(R4401) and
MP 72 (C4401)
SL 5 Replace
L4400
SL 4 Escalate
No
Yes
Disconnect:
VBATT and DCIO/SEPI
SL 4 Replace
N4400
SL 5 Replace
L4401
Claim Component
N4400
Auto Focus LED Problems
SEMC Troubleshooting Manual
15
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