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Won't power on and smells burnt after attempting to change the screen

Hello I was changing the screen on an iPhone XS max. Like a dumb *** I forgot to unhook the batteries and now the phone will not turn on and it smells the burnt. I really want to fix this phone as I'm trying to do this to make extra money and this one belongs to someone else. I understand it may take some fine soldering and I'm prepared to do that. I just need help troubleshooting to find exactly what part to change. From what I figured out so far I'm thinking I fried the power ic. Am I even close? Can someone with some expertise in the field please help? I really appreciate any input Thanks and have a great day!

Contestado! Ver respuesta Yo también tengo este problema

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Hello again everyone.

I decided to try the screen on this phone again and guess what. It worked! Everything works as it should. I have no idea what went wrong but this thing smelled bad and would not even power on a week ago. It's just been sitting on the shelf and decided to come back to life. I'm glad I didn't send it off to get the motherboard repaired for $300. Anyway thanks to everyone who did respond to my question

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That’s good news! I would go buy a lottery ticket if I were you.

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Yes Chris it is very good news since instead of having to pay out of my own pocket to get the lady's phone fixed or buying it from her I ended up making a profit as planned. She was ecstatic and so was I. I may grab a lottery ticket but I think that payment for the repair was my scratch off.

I just wish I knew exactly what happened and why it smelled and wouldn't power on and then decided to work perfectly after sitting for a week. I'm sure if the right person sees this they'll chime in with an answer.

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If you want the communities help diagnosing your phones problem, you will need the following equipment.

·         Schematics diagram for the phone.

·         Board view software.

·         Multimeter.

·         Microscope.

These are only for diagnosing the problem. You will need more equipment for the repair.

I recommend trying another screen first in case the damage was only applied to the screen.

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Thanks. I am working on getting that equipment. I will have it all soon as well as what I need for repair. Changing a screen is one thing but I want to get deeper into it. I just need a little guidance and practice.

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Did you use an aftermarket LCD screen assembly instead of the original design OLED assembly? If so, then a crease in the screen will short main voltage to ground and burn up the display connector. I did a video on this a few months ago. https://www.youtube.com/watch?v=D_PnL0KK...

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I sure did use an aftermarket LCD assembly. I'll be sure to watch that video. Thanks.

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I just watched your video. Nice work. I haven't done any repairs of this nature yet but I do have some knowledge of electronics and soldering so I won't let that stop me from trying. I am starting to gather tools and supplies so I can start practicing. I have plenty of devices to practice on so no problem there. I really appreciate the help and I'm glad I found this forum. Thanks again everyone.

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I believe you fried your motherboard. Hate to say it but there’s not much you can do.

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The mother board has not been fried. A component on the logic board or screen has suffered electrical damage. The component should be replaceable.

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I wish you luck then, good sir!

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This answer is wrong.

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I mean, it’s not that it’s wrong. It’s not specific enough. I’ve been around burnt components before.

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You're implying that you can kill an iPhone XSMax logic board by some kind of transient battery short, and that it is not repairable---that's wrong. You're getting pushback on this from the repair community because the OP marked this as "chosen solution" which could mislead a lot of people. This phone is repairable, although it may take a trip to your local iPhone logic board microsolderer.

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