iPhone 7 plus,Boot loop when home button is connected


I have a issue on a iphone 7plus , device was dead ,no waterdamage and all original parts , some testing en measurements did show a defective tristar.

Did put on a new tristar , device was back ,amps and charge ok .

But when device would boot it gets in to a bootloop.Did some diode measurements on the board but all looks fine.

Did swap with another lcd/touch all the same, but then I noticed that when flex off home button was disconected that device did boot ok.

So I pulled ic from mesa and mamba as a test , reconected homebutton but device went back to bootloop.

So I’m a bit stuck now, i think this a data issue , but witch ICs needs info from homebutton to boot correctly?

ps: I did try to activate device without homebutton, al went well, wifi ok, but each time activation cancelled “ not abel to connect apple server , please try again later”.

I know this looks like some issues with baseband , but voltage pma-ic for baseband tests ok .

Anyone some ideas?

Kind regards


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