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P7382i / P7389i
Repair Chart
Table 2. GSM P7382i / P7389i Cellular Telephone: Troubleshooting and Repair Chart. (Assembly Replacement
Level).
SYMPTOM
Personal telephone will not turn on or
stay on
2. Personal telephone exhibits poor
reception and/or erratic operation
(such as calls frequently dropping,
Weak and/or distorted audio, etc.).
3. Display is erratic, or provides
Partial or no display.
30
of 50
PROBABLE CAUSE
a) Battery pack either
discharged or defective
b) Battery connectors open
or misaligned.
c) Logic/RF Board
Assembly
Defective.
d) Display circuit failure
a) Antenna is defective
b) Logic/RF Board
Assembly
Defective.
a) Mating connections to /
from LCD Module faulty.
b) LCD module is
Defective.
c) Logic/RF Board
Assembly
Defective.
European Customer Services
VERIFICATION AND
REMEDY
Measure battery. If the battery voltage is <4.00 V dc,
recharge the battery using the appropriate battery
charger. If the battery will not recharge, replace the
battery.
If battery is not at fault, proceed to b.
Visually inspect the battery connectors on both the
battery assembly and the portable telephone.
Re-align and, if necessary, replace either the
Battery or the battery connector assembly. Removing
the battery connector assembly has to be done with
extreme care to avoid damaging the housings. If
battery connectors are not at fault, proceed to c
Remove the Logic/RF Assembly. Substitute a known
good assembly and temporarily reassemble the unit.
Depress the PWR button; if unit turns on and stays
on, disconnect the dc power source and reassemble
the telephone with the new Logic/RF Board
assembly (see personality transfer). Verify that the
fault has been cleared. If the fault has not been
cleared then proceed to d.
Disassemble unit and remove LCD module and
insert known good module. Insert Battery and
depress PWR button. Ensure unit stays on, if OK
reassemble unit in new housing assembly
Check to make sure that the antenna pin is properly
connected into the Logic/ RF assembly. If OK,
substitute a known good antenna and test in a call. If
the fault is still
present, proceed to b.
Replace Logic/RF Assembly (refer to symptom 1c).
Verify that the fault has been cleared and
Re-assemble the unit with the new PCB.
Dissasemble unit, check general condition of pads to
display. If OK proceed to b.
Substitute a known good LCD module onto the
suspect board and connect to DC Pwr supply.
Depress PWR and ensure display is now correct, if
Ok rebuild unit with new LCD module if LCD
module is not at fault proceed to c.
Replace Logic / RF Assembly (refer to symptom 1c).
Verify that the fault has been cleared and
Re-assemble the unit with the new PCB.
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