W995
1230-1858 rev. 1
TROUBLESHOOTING
Display Problems
T
R
O
UBL
ESHOOT
ING
- Display Illumination Problems
Are the
Display Backlights
Ok
Go to
Display illumination
Problems TRS guide
No
Is the picture
too dark or
too light
Yes
Go to
Opto Sensor
Problems TRS guide
No
Disconnect: VBATT and DCIO/SEPI and
Remove PBA from the TRS Fixture
Use a Digital Multimeter instrument (DMM)
and perform:
Z4200, Z4201 and Z4202
Display Filter
Test 1
and
Test 2
Yes
START
Load ETS SW into the Phone
Use TRS Fixture
Connect:
Slider Flex Assy, PBA Navi Key and Display to the PBA
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
MMI
Misc
Init Screen Testing
Display Pattern
Activate:
TV Test Pattern
If the Display is working on the TRS Fixture
then Replace
Display, Slider Flex Assy or PBA Navi Key
If not then continue with Display Problems TRS guide
(It is recommended to use a microscope for these
measurements!)
Display Filter
Test 1:
Check that Pins: 1, 2, 3, 4, 5, 6, 7, 8
are
NOT
short circuit to GND
Display Filter
Test 2:
Max 15 Ohm between the following pins:
Pin 1 and 5
Pin 2 and 6
Pin 3 and 7
Pin 4 and 8
NOTE !
Test 1
and
Test 2
must be made on all filters
Are all
Display Filters
Ok
Replace
Z4200, Z4201 or
Z4202
No
Replace
X4300
Yes
Are
L4208 and L4209
= Max 2 Ohm
SL 5 Replace
L4208 or L4209
SL 4 Escalate
No
Yes
Is the Display
Problem solved
Claim Component
X4300
SL 5 Replace
N2010
SL 4 Escalate
Yes
No
Display Problems
START
Load ETS SW into the Phone
Use TRS Fixture
Use TRS Fixture Display Holder and Connect:
Slider Flex Assy, PBA Navi Key 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 the Display Backlight is working on the TRS Fixture then
Replace
Display, Slider Flex Assy or PBA Navi Key
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 Slider Flex Assy and remove
the Display Holder from the TRS Fixture
3.7V - 3.8V DC
at MP 111 (TP4201)
No
Fault trace SW
MMI
Misc
Init Screen Testing
Led and Backlight
Activate:
Display Backlight
More than
15 Volt Pk-Pk Pulses
at MP 111 (TP4201)
Shortly after the Display
Backlight has been
Activated
Yes
0 Volt DC
at MP 113 (TP4202)
When the Display
Backlight is
Activated
Yes
Replace
N4200
Yes
SL 5 Replace
N2000
SL 4 Escalate
No
No
More than
3 Volt Pk-Pk
Pulses at MP 43 (R4200)
When the Display
Backlight is
Activated
Replace
X4300
Yes
SL 4 Replace
V4203
SL 5 Replace
R4213 or N2000
No
Disconnect:
VBATT and DCIO/SEPI
Are
L4200 and L4203
= Max 1 Ohm
SL 4 Replace
L4200
SL 5 Replace
L4203
No
Is
C4203
Short Circuit
Yes
Replace
C4203
Yes
Replace
N4200
No
Display Illumination Problems
SEMC Troubleshooting Manual
9
(125)