iPhone 4S chip overheating after replacing screen I just bought a used iPhone 4S with cracked screen, and installed a new lcd with gold frame. Just after putting the phone together it starts overheating. I have not installed any apps since recovery (fresh start). It seems as if the chip and the flash memory gets extremely hot. I almost burned myself touching it! The battery drains quickly from 20% to shutdown in a few minutes. 

Does anyone know a solution to this?
This seems relevant: https://www.hcqs.com.cn/blog/how-to-fix-iphone-overheating-after-screen-replacement.  It indicates that while replacing the screen one could introduce a short that causes overheating.