Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

i have a nice iPhone 3GS which has a curious behaviour.

I'm not using it often but when i'm doing CPU intensive things like a game, it just shuts down suddenly, screen becomes black an i can't restart it without putting it on the charger. It's not hot.

Then i plug it, and it just boots and is runs ok with the same battery level as before the crash.

I thought changing the iOS would fix that but it doesn't .. i'm on iOs 6 and it's still the same behaviour

What could i do ? thanks

share|improve this question
    
Sounds like a hardware problem. Maybe an Apple Genius at the Apple store would be able to help you out. –  bassplayer7 Nov 23 '12 at 20:48
    
Ok I'll try to do that ... I was thinking about a short circuit or something like that but other people told me to restore the phone to fix such behaviour so i did not know what to do :) –  Fredv Nov 24 '12 at 7:43
    
Well if you didn't mind wiping the phone, it wouldn't be a bad thing to do (Settings > General > Reset). It's entirely possible the folks at Apple will want you to do that. It's really easy if you back up to iCloud. My guess is it's a hardware problem, but again, restoring the OS wouldn't hurt anything. –  bassplayer7 Nov 24 '12 at 13:24
    
That's what the phone does when the battery is depleted. Games drain the battery very quickly and a 3GS is so old that it probably runs out of power when stressed like that. I've seen battery levels jump quite a bit on a 3rd gen iPod Touch between playing games and other apps. –  Mark Jan 16 '13 at 19:25
    
Well no the behaviour is different : when i play and use CPU strongly, it just stops. But when i plug it on a USB to restart it, the battery is not empty : it's just like it was before it stopped. I have found that it made this behaviour only with CPU intensive things –  Fredv Jan 17 '13 at 13:40

2 Answers 2

If it's CPU related then it's likely heat or a problem with the logic board / processor unit.

If it's related to a certain point in the battery discharge cycle, it's likely the battery and more inexpensive to repair.

share|improve this answer

Sometimes when you run some games that is not compatible with your iPhone, it will use more power than it can to the CPU and GPU and then it will crash. Try to verify if the game is compatible with iPhone 3GS

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.