To Search For Components Throughout The Entire Document Use The "Search" Function In Adobe Numeric Keyboard Problems; Navigation Keys Problems - Sony Ericsson W995 Troubleshooting Manual

Numeric Keyboard 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
SL 5 Replace
R2472, R2483 or 1.8 Volt at
No
N2010 MP 65 (V2475_Pin 2)
SL 4 Escalate
Yes
1.7V - 1.8 V
at MP 68
(V2478_Cathode)
Yes
1.7V - 1.8 V
at MP 70
(V2477_Cathode)
Yes
SL 5 Replace
R2475, R2486 or 1.8 Volt at
No
N2010 MP 62 (V2476_Pin 1)
SL 4 Escalate
Disconnect:
VBATT and DCIO/SEPI
Are
SL 5 Replace
L2476,L2477,L2478
Faulty Component No
and L2479
SL 4 Escalate
= Max 1 Ohm
TROUBLESHOOTING
1: Disconnect the VBATT and DCIO/SEPI
Disconnect the Key Flex Assy from the PBA
2: Connect the VBATT and DCIO/SEPI
SL 5 Replace
1.8 Volt at R2470, R2481 or
No
MP 63 (V2474_Pin 2) N2010
SL 4 Escalate
Yes
SL 5 Replace
1.8 Volt at R2471, R2482 or
Yes No
MP 64 (V2474_Pin 1) N2010
SL 4 Escalate
1.8 Volt
SL 5 Replace
at MP 67
No Yes V2478
(V2478_Anode)
SL 4 Escalate
SL 5 Replace
R2473, R2484 or
No
N2010
SL 4 Escalate
1.8 Volt
SL 5 Replace
at MP 71
No Yes V2477
(V2477_Anode)
SL 4 Escalate
SL 5 Replace
R2474, R2485 or
No
N2010
SL 4 Escalate
Are
SL 5 Replace
MP 57 (V2471_Pin 1)
Yes Yes V2471 or N2010
and MP 58 (V2471_Pin 2)
Short Circuit to the
SL 4 Escalate
GND
No
Are
SL 5 Replace
MP 51 (V2472_Pin 1)
No and MP 52 (V2472_Pin 2) Yes V2472 or N2010
Short Circuit to the SL 4 Escalate
GND
SL 4 Replace
X2410
Yes
SL 5 Replace
N2010
Numeric Keyboard Problems - Navigation Keys Problems

Navigation Keys Problems

Go to Service Tests Menu and perform Keyboard Test
If successful flash the Phone with the EMMA SUCR SW
Load ETS SW into the Phone
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:
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
1: Disconnect the VBATT and DCIO/SEPI
2: Disconnect and Remove the
Display Holder from the TRS Fixture
SL 5 Replace
L2480 No
SL 4 Escalate
SEMC Troubleshooting Manual
START
Step 1:
if not go to Step 2.
Step 2:
Use TRS Fixture
MMI
Misc
Init Screen Testing
Activate
Keypad Scan Test
Is the Go to
Numeric Keyboard No Numeric Keyboard
Ok Problems TRS guide
Yes
Is SL 5 Replace
MP 73 (V2473_Pin 1) Yes V2473 or N2010
Short circuit to SL 4 Escalate
GND
No
SL 4 Replace
Is L2480 X4300
Yes
= Max 1 Ohm SL 5 Replace
N2010
1230-1858 rev. 1
W995
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