iPhone 4S Pentalobe Screws
The title is misleading, and only covers the upper shell removal. I believe your issue is that you want to replace the display panel only, and not the enclosure or camera device. In most cases, however, technicians will simply counsel replacement of the entire upper shell, as replacing inner display components will rack up service hours and end up costing the equivalent of a new shell.
From an iFixit perspective, however, this is moot. You could find a display panel component on ebay, and do the work. I hope you found a more in-depth guide.
What are some cases in which a magsafe board might be damaged and require replacement?