SH888, S868, Standare Electrical Repair
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6 Charging.
6.1 Type of charging fault.
Make a visual check of the battery screws and the system connector. Replace if
needed. Start the phone using the On/Off key with a fully charged battery inserted.
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If it doesn’t start, proceed to chapter 3 (“Doesn´t start”-fault).
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If the phone starts and indicates that it’s charging, proceed to section 6.2.
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If the phone starts but doesn’t indicate that it’s charging, turn it off and connect a
charger into the system connector.
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If it indicates that it’s charging and the red top indicator is lit the phone is ok.
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If it doesn’t display anything in the display and the red top indicator isn’t lit, pro-
ceed to section 6.3.
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If the phone doesn’t charge the battery although it indicates that it does, proceed
to section 6.4.
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If the phone starts and indicates that it’s charging but the red top indicator isn’t
lit, proceed to chapter 9 (“Illumination and buzzer”-fault).
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 charg-
ing 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 Indicates charging without charger con-
nected.
Open the phone and check for liquid damages. Give the board power and start it up
using the On/Off key.