become hot samsung a34

@snlbrz heat=short circuit. You did not tell us if anything happened to your phone, things like water damage etc. are important to mention. If nothing else, you do want to replace the battery since that is a common part to heat up when overworked or internally shortened out.

Since iFixit does not yet have a guide for it, use the one from here Replacement batteries are widely available and choose a vendor in your area due to some shipping restraints on batteries.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this