Question about Apple iPhone 4S

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Where is the serial stored on an iphone 4s as need to change the chip. from another logic board to another board due to heat damage

I'm trying to find where the serial is stored on logic board, as have a locked iphone and one with heat damage due to the wifi chip setting fire, want to swap the chip etc over to the locked logic board to use the unlocked and no icloud activated, tried to change the wifi chip but the pins for the chip have burnt off the board. any help would be appreciated thanks

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Posted on Apr 21, 2015



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I replaced logic board unlocked but their is can disable .

So you bought a logic board and when you installed it, it already had a password set on it? That means the logic board was not new. Take it back to the Apple iStore.

You can clear it by connecting it to iTunes on a computer and do a factory reset.

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My iphone 4s went completely blank black screen and it is not dead or powered off. i can hear it if it rings and it vibrates aswell. what can harm this to happen? is it old age?it is 5 years old.

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The button to access Wifi is grayed out on my I phone 4S

Iphone 4s wifi gray out problem is hardware problem, the wifi chip got welding off (or called fake weld). This is nothing to do with software upgrade.

I just fixed my iPhone 4s with gray out problem. This is not same as the way others talked --heating and cooling. this method needs to open iPhone case.

here is how (with phone power off):
1) open case (many youtube videos will teach you how).
2) remove metal covers, you will see the wifi chip (within red lines.);237135_750913605901185076329097be036.jpg

3) carefully (with a sharp knife) remove the black insulation layer completely (red lines), will put insulation layer later.

4) after remove the insulation layer, you will see the wifi chip like this picutue ( I borrow this picture. wifi number and ID is blacken out):237135_aed31360590130dc0aac5421381e0.jpg
5) then, heat-up your solder iron (40-60 W is OK).
6) use a wood stick, press down in the middle of wifi chip (black big dot in the middle). then use the tip of solder iron to push each blue dot about 20-30 seconds tightly, the heat of soldering iron will be passed to the chip to do re-soldering work. you need to do this step with 8 dots one by one, not stop.

7) after soldering work, put back black insulation layer back.then resemble the iPhone 4S.

the Job is done and your wifi should work now.

Good luck.
( this is only for those Iphone 4s with warranty expired)

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common problem with iphone 4s. Means your wifi chip is disconnected from circuit board or defective. Some small iphone shops fix it by resoldering, but under some conditions it may happen again. High/low temperatures, drops and so on. If phone is still under warranty - apple will replace it free.

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Hi, it sounds like the graphics chip on your logic board has gone faulty, I don't think you can change it as a component, so you will need a new logic board, it is fairly easy to change if your confident enough to strip your phone down, new ones are way to expensive so buy a faulty but working phone from ebay but make sure the one you buy has the screen lit up so you can see the icons, and that should be ok, failing that any local phone repairer can do it for you

hope this helps

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it is most likely that your hard disk has a damaged OSX installed, if you get no error codes then it is likely that the video chip has melted the solder due to over heating, try forcing a shut down by holding the power button down for 8 seconds, then holding the option button turn it on again, if you see other options then its a damaged OSX and will need repair, no screen and its main logic board replacement, go to they are very good at fixing problems mac related and will offer refurbished machines cheep too.

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