Something else that is often overlooked is a completely drained battery. Usually they will not charge.
This can be rectified quite easily.
How we do this is as follows....
Before connecting battery or after you disconnect, check if there is power in it(even a small bit) if there is it should accept a charge.
However, if the power in it is 0.5 volts or less, it may, because of the diode accepting input current, reject the charge.
This happens purely because the low power ratio can not determine in the diode which is negative and which is positive.
Having the drained battery disconnected or at least the Positive(Red) wire, Using a PP3 9V battery and two wires Connect positive to Positive and negative to Negative for 5 seconds.
Doing this blasts a small quick charge into the battery and also determines the correct polarity.
Re-conect the battery, you may be surprized! this boost can revive many a dead battery.
@anthony
If you are sure your battery is 100%, connections 100%, Display 100%, the next step back is your I/O button.(sleep)
@polly
There are 4 terminals on an iPhone battery. You should measure anywhere between 3.5 - 4.2 volts between the + and - terminals. The other 2 terminals are a temperature sense line and a data communications line.
Unfortunately, i do not have a 3g or 3gs in the workshop to answer your query. A miltimeter across the 2 OUTER pins will determine which is +.
8 Comments
Thanks for the help guys. I have tested the oem battery like jim mentioned and it was reading 3.8volts. So i have put oem battery back into phone and carefully put phone back together. I left phone plugged into wall charger overnight to charge battery. But it still will not turn on or be recognised by itunes when connected to computer.
Is there anything else that i could look at to make it work?
Thanks
by Anthony
does the vibrate button work?did it ever work? if there is no vibrate then it could be your battery connection is flattened or not making contact. Itunes will not recognise a phone if there is not enough power to turn it on..the usb supplies minimal power compared to battery/wall charger. Inspect your battery for flattened pins and dirty connections. you might also want to take a look at your external dock for dirt and damage as this may be why itunes can't see the phone.
by pollytintop
ps... if you still have a problem please don't accept the answer until it's all worked out...you can unaccept it so that people keep coming back to this question. If you leave it as solved it may be disregarded.
by pollytintop
The usb cable that i have been using recognises my partners ipod but still doesnt recognise my iphone. I also inspected battery and there was no dirty connections or flattened pins.
by Anthony
Anthony have you looked at the dock on the phone?(not the cable)
by pollytintop
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