C905
1222-9526 rev. 1
TROUBLESHOOTING
WCDMA VIII Problems
TROU
B
L
E
S
H
O
OTIN
G
- A-GPS Problems
Replace
N1210
No
Replace
N1200
Is the
GSM Network
Ok
Go to
GSM Network
Problems TRS guide
No
Fault Trace SW
TX and RX WCDMA
Radio Settings:
Select Band: BAND VIII
Fast select channels:
Set Low Channel
Ch LOW
Modes: Max Pwr 23dBm
START
NOTE !
This TRS guide is NOT valid for C905a and C905c Phones
NOTE !
This TRS guide is valid ONLY for C905 Phones
if the WCDMA BAND VIII is supported
Step 1:
Load ITP SW into the Phone
Perform SERP Calibration and retest the Phone
If successful claim SERP Calibration
If not go to step 2.
Step 2:
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
1.8 Volt DC at
MP 140 (R1209
WPA2_EN)
Yes
3V – 3.8V DC at
MP 145 (ST1201
VCC_WPA)
SL 5 Replace
N2010
SL 4 Escalate
No
2.8V - 3V DC at
MP 142 (C1214
WPA_C_EN)
Yes
No
Is there
problems with
WCDMA TX
Yes
Replace
N1200
No
Yes
Claim Component
N1210
Yes
SL 5 Replace
N2010 or N2000
SL 4 Escalate
No
Disconnect:
VBATT and DCIO/SEPI
Yes
Is the
L1200 = Max 0.5 Ohm
Replace
N1210
Yes
SL 5 Replace
L1200
SL 4 Escalate
No
Is the
WCDMA TX
Problem solved
Go to
SERP Calibration
WCDMA BAND VIII Network Problems
START
Step 1:
Got to Service Tests Menu and perform the GPS Test
If successful
Flash the Phone with EMMA SUCR SW
if not go to step 2.
Step 2:
Replace PBA Key Flex Flip
and retest the Phone
If successful claim PBA Key Flex Flip
if not go to step 3.
Step 3:
Replace Slider FPC Assy
and retest the Phone
If successful claim Slider FPC Assy
if not go to step 4.
Step 4:
Load ITP SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
1.8 Volt DC
at MP 91 (R1404
AGPS_LDO_EN)
1.8 Volt DC
at MP 81 (R1401
AGPS_PWRON)
Yes
No
1.8 Volt DC
at MP 53 (R2116
AGPS_CLK_EN)
Yes
SL 5 Replace
N2010
SL 4 Escalate
No
26 MHz at
MP 55 (ST2107
AGPS_CLK)
Yes
No
SL 4 Replace
N2410
SL 5 Replace
N2102
1:
Disconnect:
VBATT and DCIO/SEPI
2:
Connect:
VBATT and DCIO/SEPI
Yes
Replace
N2410
No
More than
1.8V Pk-Pk Pulses
at MP 2 (ST1404)
shortly after phone
Power On
SL 5 Replace
N2010
SL 4 Escalate
No
1:
Disconnect:
VBATT and DCIO/SEPI
2:
Connect:
VBATT and DCIO/SEPI
Yes
More than
1.8V Pk-Pk Pulses
at MP 32 (ST1403)
shortly after phone
Power On
SL 5 Replace
N2010
SL 4 Escalate
No
Replace
X4200
Yes
A-GPS Problems
SEMC Troubleshooting Manual
28
(124)
