Display Illumination Problems; Opto Sensor Problems - Sony Ericsson C903 Troubleshooting Manual

Display Illumination Problems

START
Step 1:
Flash the Phone with EMMA SUCR SW
If successful claim SW Flash
If not go to step 2.
Step 2:
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
Led and Backlight
Activate:
Display Backlight
If Display Backlight is working on the TRS Fixture then Replace
Display, Main Flex Assy or Navigation PBA Assy
If not continue with the
Display illumination Problems TRS guide
1: Use Fault trace SW and go to:
MMI
Misc
Init Screen Testing
Led and Backlight
Deactivate:
Display Backlight
2: Disconnect the Main Flex Assy and remove
the Display Holder from the TRS Fixture
SL 4 Replace
0 Volt DC at
V4200
No MP 26 (TP4201) and Yes
SL 5 Replace
MP 20 (TP4202)
N2000
Replace
Yes
X4202
Replace
Yes
N4201
TROUBLESHOOTING
SL 4 Replace
N4201
Yes
SL 5 Replace
L4201
3.7V - 3.8V DC at Replace
No
MP 57 (N4201_Pin 3) L4200
No
3.7V - 3.8V DC
at MP 25 (TP4200)
Yes
Fault trace SW
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Display Backlight
17V - 20V
Pk-Pk Pulses
at MP 25 (TP4200)
Shortly after the Display
Backlight has been
Activated
No
Fault trace SW
MMI
Misc
Init Screen Testing
Led and Backlight
1: Deactivate:
Display Backlight
2: Activate:
Display Backlight
More
than 4 Volt Pk-Pk
SL 5 Replace
Pulses at MP 58 (N4201_Pin1)
No N2000
Shortly after the Display
SL 4 Escalate
Backlight has been
activated
Display Illumination Problems - Opto Sensor Problems
Opto Sense Problems
Replace Main Flex Assy and retest the Phone
If successful claim Main Flex Assy
if not go to step 2.
Replace Navigation PBA Assy and retest the Phone
If successful claim Navigation PBA Assy
If not go to step 3.
Replace Display and retest the Phone
If successful claim Display
if not continue with the
Opto Sense Problems TRS guide
Go to
Display illumination No
illumination (LEDs)
Problems TRS guide
Go to
Dispaly Problems No any picture/image in
TRS guide
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
SL 5 Replace
N2000 No
MP 107 (R2250 OPTO_EN)
Shortly after phone
SL 4 Escalate
Replace
No
MP 37 (TP2203 VOPTO30)
N2210
Shortly after phone
SL 5 Replace
N2000 No Opto Sensor Problem
SL 4 Escalate
SEMC Troubleshooting Manual
START
Step 1:
Step 2:
Step 3:
Is the
Display
Ok
Yes
Can you see
the Display
Yes
1.8V – 2.3V
Pk-Pk Pulses at
Power On
Yes
3V – 3.5V
Pk-Pk Pulses at
Power On
Yes
Replace
X4202
Is the
Claim Component
Yes
X4202
solved
1228-1147 rev. 1
C903
11 (129)