What was under the OLED you ask? If you guessed Graphite, you win! As per the usual methods of phone design, there is a large (screen size) piece of graphite directly under the display.

Under that graphite, we find how they installed the vapor chamber.

Well, now that we have effectively determined the OLED is broke...how can we test? Well we simply just test to see if the vapor chamber works better than other options.