[AC Question]

My Galaxy trend plus is started by heating up a lot and draining battery fast. The one day when I was charging it through a car charger it just ceased to charge till the battery got flat. I haven't been able to charge it through the cable. So I would remove battery and charge it on universal charger.I changed the touch screen of my phone which was cracked and it still worked though not charging normaly. I had the charging port changed and it wrkd for jst a day and then it it ceased to switch on altogether. It hasn't switched since then

[Rukbat]

I'm going to assume the easiest "solution" to your question - you did something inside the phone and caused a problem. That led to the overheating and charging problems.

If they started before you worked inside the phone, you should have brought it to a repair shop then. Finding a shop that will guarantee a repair on a phone you've already worked on is going to be between extremely difficult and impossible.