C903
1228-1147 rev. 1
TROUBLESHOOTING
On-Off Key
T
R
O
UBL
ESHOOT
ING
- Numeric Keypad Problems
START
Step 1:
Replace Navigation PBA Assy and retest the Phone
If successful claim Navigation PBA Assy
if not go to step 2.
Step 2:
Replace Main Flex Assy and retest the Phone
If successful claim Main Flex Assy
if not go to step 3.
Step 3:
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Is the
Problem with
Power Off
No
3.7 Volt DC
at MP 46
(V2470_Cathode)
Yes
Yes
SL 4 Replace
X4202
SL 5 Replace
N2000
No
1.8 Volt DC
at MP 44
(V2470_Anode)
Replace
V2470
Yes
SL 5 Replace
V2480, R2459, R2471
or N2010
SL 4 Escalate
No
SL 4 Replace
V2470 or X4202
SL 5 Replace
N2000
On-Off Key Problems
START
Load ETS SW into the Phone
Use TRS Fixture
Connect Key Flex Assy and Keyboard to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Activate
Keypad Scan Test
Perform Keypad Scan Test by pressing all
Keypads on the Key Flex Assy and the Camera Button (S2403)
If successful Replace Key Flex Assy
If not then continue with the
Numeric Keypad Problems TRS guide
No
Go to
Camera Button
Problems TRS guide
No
Is the
Camera Button
S2403
Ok
1:
Disconnect the VBATT and DCIO/SEPI
Disconnect the Key Flex Assy from the PBA
2:
Connect the VBATT and DCIO/SEPI again
SL 5 Replace
R2454, R2470 or
N2010
SL 4 Escalate
1.8 Volt DC
at MP 50
(V2480_Pin C2)
SL 5 Replace
V2480 or N2010
SL 4 Escalate
Yes
No
Is
MP 50 (V2480_Pin C2)
Short circuit to
GND
Yes
Is
MP 45 (V2481_Pin C2)
Short circuit to
GND
Yes
SL 5 Replace
V2481 or N2010
SL 4 Escalate
Yes
1.8 Volt DC
at MP 45
(V2481_Pin C2)
No
SL 5 Replace
R2493, R2472 or
N2010
SL 4 Escalate
No
Is MP 51
(V2482_Pin C1)
or MP 53 (V2482_Pin
C2) Short circuit to
GND
Yes
SL 5 Replace
V2482 or N2010
SL 4 Escalate
Yes
1.8 Volt DC
at MP 51
(V2482_Pin C1)
No
SL 5 Replace
R2456, R2475 or
N2010
SL 4 Escalate
No
1.8 Volt DC
at MP 53
(V2482_Pin C2)
Yes
SL 5 Replace
R2491, R2474 or
N2010
SL 4 Escalate
No
Is
MP 91 (V2472_Pin C2)
Short circuit to
GND
Yes
SL 5 Replace
V2472 or N2010
SL 4 Escalate
Yes
Is
MP 47 (V2476_Pin C1)
Short circuit to
GND
No
SL 5 Replace
V2476 or N2010
SL 4 Escalate
Yes
SL 4 Replace
X2400
SL 5 Replace
R2485, R2486, R2487
R2488 or R2489
No
Numeric Keypad Problems
SEMC Troubleshooting Manual
12
(129)