try opening the nes and disconnecting the plastic controller harnesses. connect player 2 harness where player 1 goes on the motherboard. turn the nes on and check if it works. if it doesnt, you have to change it.
clean all the games, clean the motherboard... check my replies on some previous comments for some suggestions
did it work well before it was dropped? was it unplayed for a long time before it was dropped? it's very hard to know what's wrong without seeing it. i had the problem of a dark green screen because the connections were dirty/bad, the nes worked well. i'd recommend to clean the games and the unit (i replied some suggestions to someone above here)
3) also, you must clean very carefully the motherboard contacts (where the connector goes). i suggest the pencil rubber and brasso as well. but before doing this, get some soft brush and clean the motherboard out of any dust. blow some compressed air into it if you have something to do so. also clean everything on the nes, the plastic inside and outside, the metal covers, etc. the connections are really sensitive.
it takes a lot of patience sometimes, depending on the state of the unit.
2) if you've got a chinese 72 pin connector replacement, you mostly will have to dispose it. the pins are made of cheap metal materials which are no real solution. here you have two options: one is trying to fix your old original 72 pin connector. other is buying a blinking light win from arcadeworks. if you have your old original 72 pin connector, you can boil it on water (search youtube for tutorials) and also CAREFULLY bend the pins up a bit - not too much!. As for boiling, I dont really like the boiling thing - I've tried it and I don't like the idea of submerging something that has metal components into water. I rather bend the pins a bit. If you are going to bend the pins, check some youtube tutorial or something, but really, be careful, you must not bend them to the sides or too far up. also, get an old tootbrush, clean it well, submerge it on alcohol (the more % the better, i got 96% alcohol but anything above 70 would be fine) and clean the connector on both ends (carts and motherboard. continues---
this happened to me when i got a bunch of old games. first game i tried worked. then tried some others and none worked. not even the first one, not even the ones that i had worked before. probably because dirt on the games. when i cleaned the first game i tried of that bunch, it was really dirty. my suggestion is:
1) get a 3.8mm screwdriver security bit (aliexpress for around 2 usd) and open all the games that you have. clean them the best you can. for cleaning i suggest: get a pencil rubber and rub the contacts (the part that connects to the 72 pin connector) a lot. get some brasso and an old cotton sock and clean the contacts a lot (try to have good light and you will see how the color of the metal changes), when you are finished, get a paper towel and keep rubbing the contacts until you feel it's completely dry and clean. now close your games back.
Sobald er das hat, wird er in der Lage sein, eine Grafik zu seiner im Laufe der Zeit erlangten Reputation zu sehen.
Hier ist eine Vorschau, wie die Grafik aussehen wird:
Noch keine Reputation erlangt.