Charging Fault - Ericsson I 888 Trouble-Shooting Instruction

6 Charging fault

6.1 Type of charging fault.
Do a visual check of the battery screws and the system connector. Change if neces-
sary. Start the phone with the On/Off-button and a fully charged battery.
• If it doesn´t start, proceed to chapter 3 ("doesn´t start"-fault).
• If the phone starts and shows charging at once, proceed to section 6.2.
• If the phone doesn´t show charging, turn it of and connect a charger to the sys-
• If the battery doesn´t charge, even if the phone shows it does, proceed to section
• If the phone starts and shows charging, but the red top indicator doesn´t shine,
6.1.1 Verification of the charging function.
Attach a real battery to the phone. The batterys voltage must be high enough to get
the phone started, otherwise will not the charging begin at once. Cut a piece of cable
from a charger and make a charging test cable. Connect the charging test cable to a
power supply that shows the current consumption. Make sure the positive side from
the power supply connects to DCIO (the lonely pin on the system connector, pin
12). You can also use a normal charger with an ammeter connected in serie. Set the
power supply on 7.6 V and current limitation on 700 mA. Connect the charging
cable to the phones system connector and check the current consumption.
If the phone starts and shows charging in the display and the current consumption
on the power supply varies between ~700 mA (the solution with a normal charger
and a ammeter gives ~500-800 mA depending on what kind of charger you use) and
~5 mA with a few seconds interval, is there no charging fault.
After every repair of the charging function, you have to verify the function using the
method mentioned above.
6.2
Open the phone and check for liquid damages. Give the board power and start it
with the On/Off-button.
tem connector. If it indicates charging in the display and the red top indicator
shines, the phone is okay. If it doesn´t show anything in the display and the red
top indicator doesn´t shine, proceed to section 6.3.
6.4.
proceed to chapter 9 ("Illuminatin and buzzer"-fault).
Shows charging without a charger con-
nected.
4-00021-2/FEA 209 544/5.C
I888, Standard Electrical Repairs
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