Chosen Solution
Hello I have a 2013 iMac 21.5 with what I believe a fried logic board. The back light of the screen went out so obviously I bought a new screen and hoped it would fix it but, nope. Anyway I decided to take the whole interior apart and eventually got to the logic board and found a burned area next to the ram attachment area and I was wondering if this could be the reason why the back light no longer works. And if maybe it’s fixable because I know you guys don’t sell them. Update (03/06/2017)
@ryanhandy that is definitely your backlight circuitry including the boost circuit for the backlight. Plenty of damage and broken traces. There might be a way to fix it but you will need to know how to microsolder etc. It may be more economical to either send it out for repair or replace the board. The components itself are simple caps All three capcitors are 2.2UF 100V 10% in a 1206 package
Sadly, I think its to far gone to fix economically. I think it would be best to replace it. But, the worry here is what caused the damage in the first place! You stated the backlight went so you then bought a replacement display. When you plugged in the new display did you hear a pop or see or smell the smoke? Did you hear a pop or see or smell smoke when the backlight went at the very start? Do you have your system on a surge suppressor or UPS? Did you encounter a power disruption or a lightning storm?
This would be pretty straight forward fix for any microsolderer. If you bring me just the board I’d do the work for no more than $100. Not promoting any services. Just saying. I’m currently not in front of schematics but it looks like this could be the culprit of your issues.
