C903
1228-1147 rev. 1
TROUBLESHOOTING
T
R
O
UBL
ESHOOT
ING
Dead Phone Problems - Display Problems
START
NOTE !
Before following this guide the
Dead Phone Problems part 2 TRS guide
must be finished.
Is the
VCORE12
Voltage
Ok
1.1V – 1.2V DC
at MP 74
(V2201_Cathode)
3.8 Volt DC at
MP 67 (L2201)
No
SL5 Replace
L2201
SL4 Escalate
No
Yes
No
Yes
1.1 – 1.2V DC
at MP 61 (C2220)
Replace
L2200
No
SL 5 Replace
N2000 or N2010
SL 4 Escalate
Is the
VCORE18
Voltage
Ok
No
SL 4 Replace
N2200
SL 5 Replace
C2231 or N2010
No
Yes
Yes
Is the
ETS SW Flash
Successful
SL 5 Replace
N2020
SL 4 Escalate
Yes
No
Yes
SL 5 Replace
V2201 or N2000
SL 4 Escalate
Is
MP 56 (L2202)
Short circuit to GND
Yes
SL 4 Replace
N2200
SL 5 Replace
N2010
Step 1:
Disconnect:
VBATT and DCIO/SEPI
Step 2:
Connect:
Main Flex Assy and Navigation PBA
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 ETS SW
Go to Data
Communication
Problems TRS guide
Disconnect:
VBATT and DCIO/SEPI
Is
L2202 = Max 0.5 Ohm
SL 5 Replace
L2202
SL 4 Escalate
No
Yes
Dead Phone Problems part 3
Is the
Display Backlights
Ok
Go to
Display illumination
Problems TRS guide
No
Is the picture
too dark or
too light
Yes
Go to
TV OUT Problems
TRS guide
No
START
Load ETS SW into the Phone
Use TRS Fixture
Use TRS Fixture Display Holder and Connect:
Main Flex Assy, Navigation PBA Assy and Display to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Display Pattern
Activate:
TV Test Pattern
If Display is working on the TRS Fixture then Replace
Display, Main Flex Assy or Navigation PBA Assy
If not continue with the Display Problems TRS guide
Replace
X4202
Yes
Is the Display
Problem solved
Claim Component
X4202
Yes
SL 5 Replace
N2010
SL 4 Escalate
No
Is TV OUT
Ok
Yes
Go to
Opto Sense
Problems TRS guide
No
Display Problems
SEMC Troubleshooting Manual
10
(129)