Back Side Led Problems; Tally Led Problems - Sony Ericsson Cyber-Shot C905 Troubleshooting Manual

Back-Side LED Problems
START
Load ITP SW into the Phone
Use TRS Fixture
Connect: Flash Complete to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Back-Side LED
If the Back-Side LED is working on the TRS Fixture
then Replace Flash Complete
If not then continue with the
Back-Side LED Problems TRS guide
Disconnect:
VBATT and DCIO/SEPI
Disconnect:
Flash Complete from the PBA
Max
1 Ohm between SL 5 Replace
MP 74 (R4401) and
No
MP 72 (C4401) SL 4 Escalate
Yes
Connect: VBATT and DCIO/SEPI
Restart Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Back-Side LED
5 Volt DC at
MP 56 (TP4400) when
No
Back-Side LED
is Activated
SL 4 Replace
SL 5 Replace
Yes
TROUBLESHOOTING
L4400
Replace
N4400
X4400
N2000
Back Side LED Problems - Tally LED Problems
START
Load ITP SW into the Phone
Use TRS Fixture
Connect: Flash Complete to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Tally LED
If Tally LED is working on the TRS Fixture
then Replace Flash Complete
If not continue with the
Tally LED Problems TRS guide
Disconnect:
VBATT and DCIO/SEPI
Max 1 Ohm
between
No
MP 74 (R4401) and
MP 72 (C4401)
Yes
Connect: VBATT and DCIO/SEPI
Restart the Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Tally LED
Is
any of
MP 134 (V4400_Pin 1)
Replace
and MP 148 (V4400_Pin 3)
No
N2410 Short circuit to
PBA GND (Shield
Can Fence)
SL 5 Replace
V4400
Yes
SL 4 Escalate
Replace
X4400
SL 5 Replace
V4400
SL 4 Escalate
SEMC Troubleshooting Manual

Tally LED Problems

SL 5 Replace
L4400
SL 4 Escalate
5 Volt DC
No
at MP 56 (TP4400)
Yes
1.8 Volt DC
at MP 134
No Yes
(V4400_Pin 1)
SL 5 Replace
V4400
No
SL 4 Escalate
0 Volt DC
at MP 148
Yes
(V4400_Pin 3)
No
1222-9526 rev. 1
C905
Replace
N4400
Fault Trace SW:
Deactivate
Tally LED
2V – 2.5 Volt DC
at MP 148
(V4400_Pin 3)
Yes
Fault Trace SW:
Activate
Tally LED
16 (124)