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iPhone switches on when plugging in battery or power supply.

Hey guys,

I had an iphone with audio ic problem. Jumped C12 and tried starting it with a power supply. It told me it was short and I found a capacitor that was loose on VCC main. It was on the other side of the main board so it should not have been me who knocked it “loose”

Now when i plug in the battery or power supply the phone starts automatically. I have not seen this happen. When I switch off the phone it also reboots

Removed the audio IC to check if something is shorted but it looks clean and audio recording also work.

removed all the “glue” around the “power on button“ jack and dock connector jack and everything looks clean. Measured their values and those are all also correct according to ZXW.

EDIT: Swapped a board for the customer. I will send his board to China for repair. Labor isn’t worth the time/money.

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Interesting. So with the J4501 flex disconnected it still fires up when you connect the battery? What about the dock connector disconnected?

par

Yes it does and sorry for the late reply, it powers up whether it’s the battery or power supply. I removed the main board out of the case and nothing is attached.

par

I have never uncounted this before. If it was me I would remove the audio IC and see if it still does it. There are a few connections under there that go to Tristar.

par

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Finally solved the problem. There was a resistor missing on TIGRIS_TO_PMU_INT_L and that made the iphone boot up every time when connected to power.

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iPhones automatically switch on when connected to power.

Once it switches on, just turn it back off manually and it should stay off.

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No it doesn’t when you plug in the battery or power supply and I wish it was that simple. It will turn on again if I power it off.

par

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KWH sera éternellement reconnaissant.
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