U8950 Maintenance Guide V1.0
9 Maintenance Records During Verification
2012-10-22
Huawei Proprietary and Confidential
42
Stage
Station of Fault
Faulty Item
Symptom
Solution
VN1
MMI
MMI04D
proximity
light
malfunction
The proximity light
cover was reversely
installed.
The proximity light cover was
re-installed.
VN1
MMI
MMI04C
touch key
backlight
malfunction
The incoming
material of U1303
was faulty.
The problem of LCD incoming
material was cleared by replacing
the PCBA. It was determined by
testing the voltage that the incoming
material of U1303 was faulty.
However, the problem was not
verified because the product was off
line.
VN1
MMI
MMI04C
touch key
backlight
malfunction
The FPC on the
antenna board was
not properly fit.
The FPC on the antenna board was
properly fit and the test then passed.
VN1
MMI
MMI04A
tri-color
indicator
malfunction
(light leakage)
The incoming
material of
proximity light foam
was faulty. The foam
was covered by a
layer of PET,
through which the
light was leaked.
The PET on the foam was removed.
VN1
MMI
MMI04A
tri-color
indicator
malfunction
R1201 was poorly
soldered, resulting in
the missing blue
light.
R1201 was re-soldered.
VN1
MMI
MMI04A
tri-color
indicator
malfunction
The light-guiding
pole blocked partial
light from the light
hole.
The light-guiding pole was
hot-melted to the front cover and
could not be repaired. To solve the
problem, replace the front cover.
VN1
MMI
MMI04A
tri-color
indicator
malfunction
A layer of
double-sided
adhesive on the
proximity light foam
reflected the light of
the tri-color
indicator.
The double-sided adhesive was
removed and the tri-color indicator
was re-installed.
VN1
MMI
MMI03A key
malfunction
The side keys
malfunctioned. The
incoming material of
the PCBA shrapnel
was deformed,
resulting the open
circuit on the side
keys.
The shrapnel was replaced and the
test then passed.
