Chosen Solution

Hi Guys, I scratched film on LCD metal back cover plate during the screen disassembly on iphone5. However, when placing back, the display work just fine apart from that the screen might feel slightly hotter than it was before. (Or I might over sense here) I’m not sure if I should continue using phone like this or should I really replace the back plate cover.

The attached image above is how it look. Can you let me know if it’s ok to run iphone like this. Is the purpose of the film is to reduce the heat from the screen? Should I buy another back cover plate too?

Unlikely that the film is used for heat dissipation. Reflective film on LCD backing is usually for backlight reflection. If this was something that was visible than I would consider replacing the component. You should be good to go.