How to test if logic board is broken
I've got this iPhone 4S which shows a lot of issues:
- Wifi is grayed out
- Bluetooth is not working
- No cellular signal (but here I saw the antenna connector to the logic board is missing, so this can be replaced)
- Vibrator is not working
- Mic is not working
- Speaker (bottom) is not working
- Camera LED is not working
- Battery is not working (iOS always reports a full charge, even if no battery is installed)
- Proximity sensor does not seem to respond
- Audio jack (also no signal from Apple earpods remote)
- GPS data (and compass) not working
These things are working:
- Front camera
- Back camera (but not the LED)
- LCD works perfectly
- Touch works
- All buttons work (volume, mute, lock, home)
- Home button
- Dock connector (to power up)
Not tested (or not able to test):
I've also noticed that this iPhone is jailbroken (there is a Cydia app).
I've received this iPhone in exchange for my own 4S which has drowned. This repair center has moved and is unable to be contacted. So after a few months I gave up and decided to try to get this other 4S working. I was planning to buy a bunch of parts but I'm having a feelding something is wrong with the logic board. Is there any way to test it or to test any of the parts on them selves?
I have already tested the battery which does not seem to give any voltage between the outer connectors.
I don't want to buy all the broken parts if it turns out to be the logic board.
Is this a good question?