[quote name='ihaveabu' date='Aug 10 2007, 19:53' post='836391']
i'm having this problem too. my phone won't charge!?!?!?
how did u fix it? i took it apart and i'm trying to figure out the part you're talking about. is it the little dot thing with the F on it?
MPX220 Charging Problems:
I have found out that there are 3 different causes
Check if th epower connector (3 pins at the CE connector) is not loose.
If it is loose do the following procedure:
A: Procedure to remove the back cover.
Remove battery cover
Remove SIM card
Remove the 6 screws securing the back cover (the 2 top screws are covered)
Carefully remove the back cover
Then Inspect pin soldering
Use a small soldering iron to fix any possible contact problem
If the connector became loose, use Loctite to secure to the main body of the connector. In order to make it at the right position plug the USB cable. Be sure not to glue the USB connector.
Follow procedure A to remove cover
Check the component marked as "F" close to the power connector at the main board of the phone.
If it is open, replace it o solder a jumper over the fuse to test if the phone charges.
3. Pin number 2 of the power connector.
There is a design problem (I guess) using OEM or 3rd party chargers.
Looking at the power connector on the phone starting from left to right you will see the 3 pins for power and charging.
Pin 1 is ground
Pin 2 is charge voltage Testing
Pin 3 +5v
Chargers use a 33k or a 25k resistors in between pin 1 and 2.
Some chargers start charging and after around a minute finish charging or do not charge at all.
I suppose that is because of the sensing pin and the 33k resistor.
In this case I put together Pin 1 and 2 on the main board or you can do it on the charger.
These were my findings. Perhaps somebody knows better about the functioning of the charging circuit and can provide a better explanation. This worked out for me.