W995
1230-1858 rev. 1
TROUBLESHOOTING
Numeric Keyboard Problems
T
R
O
UBL
ESHOOT
ING
- Navigation Keys 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 Keys on the
Key Flex Assy
If successful Replace Key Flex Assy
If not then continue with the
Numeric Keypad Problems TRS guide
1:
Disconnect the VBATT and DCIO/SEPI
Disconnect the Key Flex Assy from the PBA
2:
Connect the VBATT and DCIO/SEPI
1.8 Volt at
MP 63 (V2474_Pin 2)
1.8 Volt at
MP 64 (V2474_Pin 1)
No
Yes
SL 5 Replace
R2470, R2481 or
N2010
SL 4 Escalate
SL 5 Replace
R2471, R2482 or
N2010
SL 4 Escalate
No
1.8 Volt at
MP 65 (V2475_Pin 2)
Yes
SL 5 Replace
R2472, R2483 or
N2010
SL 4 Escalate
No
1.7V - 1.8 V
at MP 68
(V2478_Cathode)
Yes
1.8 Volt
at MP 67
(V2478_Anode)
No
SL 5 Replace
V2478
SL 4 Escalate
Yes
SL 5 Replace
R2473, R2484 or
N2010
SL 4 Escalate
No
1.7V - 1.8 V
at MP 70
(V2477_Cathode)
Yes
1.8 Volt
at MP 71
(V2477_Anode)
No
SL 5 Replace
V2477
SL 4 Escalate
Yes
SL 5 Replace
R2474, R2485 or
N2010
SL 4 Escalate
No
1.8 Volt at
MP 62 (V2476_Pin 1)
Yes
SL 5 Replace
R2475, R2486 or
N2010
SL 4 Escalate
No
Are
MP 57 (V2471_Pin 1)
and MP 58 (V2471_Pin 2)
Short Circuit to the
GND
Yes
SL 5 Replace
V2471 or N2010
SL 4 Escalate
Yes
Are
MP 51 (V2472_Pin 1)
and MP 52 (V2472_Pin 2)
Short Circuit to the
GND
No
SL 5 Replace
V2472 or N2010
SL 4 Escalate
Yes
No
Disconnect:
VBATT and DCIO/SEPI
Are
L2476,L2477,L2478
and L2479
= Max 1 Ohm
SL 5 Replace
Faulty Component
SL 4 Escalate
SL 4 Replace
X2410
SL 5 Replace
N2010
Yes
No
Numeric Keyboard Problems
START
Step 1:
Go to Service Tests Menu and perform Keyboard Test
If successful flash the Phone with the EMMA SUCR SW
if not go to Step 2.
Step 2:
Load ETS SW into the Phone
Use TRS Fixture
Use the TRS Fixture Display Holder and Connect:
Slider Flex Assy and PBA Navi Key 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 Navigation Keys
If successful Replace PBA Navi Key or Slider Flex Assy
If not then continue with the
Navigation Keys Problems TRS guide
No
1:
Disconnect the VBATT and DCIO/SEPI
2:
Disconnect and Remove the
Display Holder from the TRS Fixture
Is the
Numeric Keyboard
Ok
Go to
Numeric Keyboard
Problems TRS guide
Is
MP 73 (V2473_Pin 1)
Short circuit to
GND
Yes
SL 5 Replace
V2473 or N2010
SL 4 Escalate
Yes
SL 4 Replace
X4300
SL 5 Replace
N2010
No
Is L2480
= Max 1 Ohm
SL 5 Replace
L2480
SL 4 Escalate
No
Yes
Navigation Keys Problems
SEMC Troubleshooting Manual
11
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