C905
1222-9526 rev. 1
TROUBLESHOOTING
TROU
B
L
E
S
H
O
OTIN
G
Dead Phone Problems
START
Step 1:
Try to recover the phone by using
EMMA SW
Press ”C”
Connect USB from PC
Run SEMC BOOT if necessary
Run SUCR SW
If successful claim SW Flash
If not continue with the step 2.
Step 2:
Use TRS Fixture
Connect Only:
VBATT
Is the
current consumption
more than 1mA
Try to trace
Faulty Component
by using Freezing Spray
Is the
Radio Module
N1200 (Tiger)
getting hot
Replace
N1200
Yes
No
No
Yes
Connect:
DCIO/SEPI to the Phone
Is the
connection between
MP 137 (X2201_Pin 3)
and PBA GND (Shield
Can Fence)
Ok
Yes
SL 4 Replace
X2201
SL 5 Replace
R2200
No
SL 5 Remove
N2000
SL 4 Escalate
32 kHz at
MP 136 (C2100) and
MP 138 (C2101)
Replace
B2100
No
32 kHz
RTCCLK at
MP 135 (ST2104)
Yes
No
26 MHz
MCLK at
MP 38 (R2102)
Yes
Yes
1.8V DC
At MP 164
(ST2203 VDDE18) and 2.8V
DC at MP 163 (C1218
LDOA_OUT)
No
No
Yes
Check the following
Voltages:
2.6V MP 125 (ST2201 VAUDIO26)
2.5V MP 165 (ST2202 VANA25)
2.7V MP 127 (ST2204 VBT27)
2.7V MP 126 (ST2205 VDIG)
2.6V MP 124 (ST2206 VBEAR26)
1.2V MP 116 (ST2209 VCORE12)
1.8V MP 40 (ST2225 VCORE18
and VMEM18)
2.8V DC
at MP 65 (C1207)
(If C905c skip this
and replace
N1200)
Replace
N1200
Yes
Replace
N1211
No
Is the
all Voltages
Ok
Step 1:
Disconnect:
VBATT and DCIO/SEPI
Step 2:
Connect:
Key Flex Assy and Slider FPC Assy
to the PBA
Connect: VBATT
Only
Step 3:
Use EMMA SW
Press the ”C” key and Connect
USB Cable from the PC to the PBA
Flash the Phone with ITP SW
Yes
Is the
ITP SW Flash
Successful
SL 5 Replace
N2020
SL 4 Escalate
Yes
Go to USB and
Software Flash
Problems TRS guide
No
No
Go to
Dead Phone
Problems part 2
SL 5 Replace
N2000
SL 4 Escalate
SL 5 Replace
N2000
SL 4 Escalate
Is the
current consumption
still more than
1mA
Try to trace Faulty
Component by using
Freezing Spray
Yes
SL 5 Replace
N2000
SL 4 Escalate
No
Dead Phone Problems part 1
START
NOTE !
Before following this guide the
Dead Phone Problems part 1 TRS guide
must be finished
Is the
VAUDIO26
Voltage
Ok
No
Is the
VANA25
Voltage
Ok
Yes
Is any of
N2200 or N2010
getting hot
No
Yes
SL 5 Replace
N2000
SL 4 Escalate
No
Is the
VBT27
Voltage
Ok
Yes
Is N1300
getting hot
No
Is any of
N2422 or N3103
getting hot
SL 4 Replace
N2422
SL 5 Replace
N3103
Yes
No
SL 5 Replace
N2000
SL 4 Escalate
SL 4 Replace
N2200
SL 5 Replace
N2010
Replace
N1300
Yes
No
SL 5 Replace
N2000
SL 4 Escalate
Is the
VDIG
Voltage
Ok
Is any of
N2411, N1300
N1500 or N1510 getting
hot.
(Note: The N1500
is missing on
C905c)
SL 4 Replace
N2411, N1300
or N1510
SL 5 Replace
N1500
Yes
Yes
No
No
SL 5 Replace
N2000
SL 4 Escalate
Yes
Go to
Dead Phone
Problems part 3
Is the
VBEAR26
Voltage
Ok
No
SL 5 Replace
N2000
SL 4 Escalate
Yes
Dead Phone Problems part 2
SEMC Troubleshooting Manual
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