When you say the ventilation stopped working, do you mean the fan no longer spins? If this is the case, I don't think removing the top will solve the problem completely. You may notice some improvement, but there will likely still be problems with overheating eventually.
The fan is integral to the cooling process, as it channels cool air through the fins on the heatsink and directs the hot air out of the console. If the fan motor has died, you can order a replacement fan online and install it in place of the old one (best solution). Otherwise you can try leaving the case open and blowing air across the heatsink with an external fan (like the kind you sit in front of on a really hot day).
As to the safety issue, if you are just removing to top of the case you wont be exposing any live wires or high voltage points, so there is not much to worry about. Just make sure you follow a tutorial for opening the case properly, or it could end up like this guys Ps2 :lol:.
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