Fairly easy repair just get a replacement battery something like this https://www.ebay.co.uk/itm/116324788123?... Then follow a battery guide like this, watch it in slow speed . Do the steps in reverse to fit a new battery. Use double sided tape or universal glue to hold the new battery in place if it doesn’t come with adhesive pre-attached. https://youtu.be/OxmT5pbKEqU?si=4ldxZMqy... There are probably other videos showing the same repair this was first hit.

If you tried different batteries with same issues it’s pointing towards a charge port issue. Check your cable is good or a different cable. Then check it’s inserting properly and the port isn’t wobbly . Shine a light in the port to check for debris or lint build up. Next thing is to open up the phone and check the ribbon flex cable is seated properly that connects to the charging daughter board / main motherboard at both ends . That’s the big flex cable, it’s possible it’s become disconnected. Also try headphone socket to see if that is working (if you can boot it) If none of that works you may need a new charging daughter board . Or replacement flex cable. Edit: My hunch is the flex has popped out the socket, leaving the phone powerless. It should just pop back in if your lucky. 🤞 https://m.youtube.com/watch?v=nFo1A4aNUy... Here’s a daughter board replacement part link. Do not order one unless all the above doesn’t work or the ribbon cable doesn’t look damaged....

Sounds like you shorted something on the board causing the backlight ic chip to fail. You need a logic board repair or replacement.

Display cable is part of the screen assembly, so you’ll need to replace the whole screen to replace the cut flex.

https://www.ebay.co.uk/itm/256559369372 I think this is the part you need it doesn’t need soldering skills to replace. Assuming the other one is broken and not just pushed into the housing, it’s possible yours just needs fixing back into place. I’ll see if I can find a teardown .

Ada kemungkinan flex baru rusak pada saat pemasangan atau sudah rusak. Mereka sangat rapuh . Saya akan memeriksa ulang semuanya di tempat yang seharusnya, jika tidak berhasil, coba kabel flex yang lain. Tidak mungkin ada yang lain. jadi entah itu flex atau tombol yang tidak berbaris dengan benar tidak membuat kontak yang baik dengan sakelar.

It is replaceable and reparable on a component level. However the fact there was smoke from the plug. You may have further board damage and need a new AC adapter. There could easily be internal as well as external fuse/s blown other stuff also potentially!?!

People shouldn’t have to be bent over and blackmailed into making soft mods to devices they own just to replace parts they have already successfully replaced . It’s disgusting.

You need a new battery. The battery could be the same battery and they just changed the percentage data. Or they purchased a dead battery as new stock unwittingly. There are fakes out there also. The odds of it being a hardware issue are low compared to the odds of having a dead battery especially in an iPhone six as they are getting on in age good parts are harder to find. I would try another battery replacement .

If it’s a P.C try removing the CMOS battery, it’s possible resetting Bios could help. We really need to know what device this is to better help with a potential fix for it.