Chosen Solution
So I got an iPhone 3g 8GB model, and I’m sort of an expert at fixing iPhones but not this kind. So I have this problem that the phone won’t turn on nor connect to my computer, but it does receive power when I connect it to an outlet with its original charger and brick. But the only thing that happens when I connect it to the power outlet, all it does is that it shows the apple logo and then 5 seconds later it dims the display but can still see the apple logo but with no backlit on the display. And also, when I click on the sleep/power button the apple logo comes back again and then does the dimming screen with apple logo again. So my predictions are that maybe the screen is okay, but maybe it can be the battery or the logic board that is bad. So what do you all think? Thanks!
Loss of power to the backlight shows that there is not enough power. Try this: Try an iPad 2.1A or 2.4A charger.Let it charge overnight with a fire extinguisher ready.Replace the battery.Replace the charger.smash it to pieces (just kidding, please don’t)
Sounds like the battery is fried the way you described it. If the backlight came on that mean that should be fine.
I have had this on a apple ipod nano 4th gen you might have a bad lcd ( there are guides on how to fix them ) or a bad backlight fuse which requires microsoldering
It sounds like either the battery is dead (likely, it’s old), and/or you aren’t waiting long enough for the boot process to complete. The 3g was fairly slow to boot. If the logo is on, it’s still booting.
Likely a battery issue as it’s an old phone and as stated before, likely it’s never been replace before. We see Apple devices act goofy even if they are plugged in when they have bad batteries. Also as stated, it could just be taking its sweet time to boot up. The real question is, why are you trying to fix this thing? Can’t imagine it will be very usable unless you are restoring it for nostalgic purposes.
I would replace the battery. If that does’t work it’s probably an issue with you’r logic board.
