Phone heats up and screen has changed to colour green

@tafiatilik that is a relatively new phone and the issue could be a. related to a bad battery and b. related to a bad screen. From what you are describing, I would replace the display assembly and the battery, then re-evaluate. There is always the possibility that this is a board error but that will have to be ruled out.

Since iFixit does not yet have a guide for this, use teh one from here It was written in Spanish so use a browser that does the translation for you, if needed. For a replacement, get the disparately that already has the midframe on since that will make it far easier than just a single display.