Won't turn on and logic board gets hot after power button fix
Good day everyone,
My tiny-actuator-helper disappeared from the power button and I had to remove the logic board to get to it for the fix.
Upon reinstallation of everything in the correct locations and in the correct order, I turned on the phone via connecting to power.
All was well for about 20-30 minutes, but while playing music through car stereo, the phone turned off and won't turn on anymore. There is no sign of life in it, except for unusual heat in CPU area.
Whenever I plug it into power, it heats up right around the processor area, but I can't tell where exactly. If I unplug the battery, the heat generation stops. Then if I plug in the battery after it cools off, nothing heats up. When applying power through a cord, it starts to heat up even after I remove the cord until the battery is disconnected. I haven't tried powering up via the power button as my fix needs to set overnight.
I have no Idea what in the vicinity of the CPU could be causing the overheating or why. Any and all assistance is greatly appreciated!!!!
Kind Regards,
Attila
Questa è una buona domanda?
9 Commenti
Upon reassembly just a few hours after initial symptoms, I was able to attempt a startup via the power button, but only got the same symptoms as before: no sign of life but for heat from CPU area.
Anyone have any idea what could cause such symptoms?
Also, anyone know where one might find a new logic board?
Lastly, if I do end up swapping logic boards, can the data be transferred over somehow?
da Attila
Attila, when you say " When applying power through a cord, it starts to heat up even after I remove the cord until the battery is disconnected" where do you plug your iPhone in? Wall charger, computer, custom charger?
da oldturkey03
Application of power is via any cable method, including wall charger, computer USB, and car stereo USB. If there is any power-up trigger (button or charging cable), it starts to heat up and doesn't stop heating up until the battery is disconnected. I didn't try to find the equilibrium temp for fear of damaging the components, but a laser thermometer read 110F on the backside of the logic board.
Thanks
da Attila
I am thinking that you are having issues with the charging circuit on your phone. Wondering if the charging IC or coil are generating the heat......
da oldturkey03
Interesting. I took a look at the 4s teardown on this site as well as googling it, and it didn't reference the charging IC or coil. Where might those be on the board?
And does replacement of these require unsoldering and resoldering? All I have is a standard 25 W Radiohack soldering iron. I never had a good enough reason to invest in an expensive soldering station, so my soldering capabilities are a bit limited.
da Attila
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