I've opened up several NES systems and they all had standard philips head screws. No problem getting in.
You have to remove the motherboard to get the new connector on, and its a tight fit, so you'll have to apply some pressure.
The real trick to reassembly is getting the black cartridge holder in place so it works right. No reason for it to be there except that the NES is trying to look like an old fashioned VCR. Clever, except for the fact that the top loading vcrs were history by 1985. Anyway, experiment with how tight you have it screwed in, and eventually the cart loader thing will stay down when you load the game in.
Also, start working with the NES by putting in carts. But not the Mario Brothers/Duck Hunt game. The earliest NES games have a thicker circuitboard that will be hard to remove from the new connector. Try other games and after a few carts the connector will be ready for anything.
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Secret trick: take NES cartridge, press cartridge down and waggle the cartridge inside the NES and then hold the NES down and shove the cartridge onto the pins. An alternate solution is to take a Q tip, dip it in rubbing alcohol and clean out all the dust inside your game.
The NES is touchy like that, sadly-- your problem isn't uncommon. My NES, and the NES of nearly every friend I have who still owns one, plays this little trick on them from time to time. Here's what we do:
1. Turn off the NES console. 2. Blow into bottom of the game, near the chip that connects to the NES. 3. Wipe away any excess dust from the game itself. 4. Blow into the console of the NES. 5. Wipe away any excess dust. 6. Re-insert the game and try again.
If this doesn't work, try placing the game in more delicately, or with more force. It's just a matter of trial and error, and sometimes it will work faster than others. Hope this helped!
You may have to face the possibility that the NES internal graphics card is old and now irreparably damaged. Unless you can procure and install another one, then the console may just be on its last legs
First try connecting through the av ports on the side of the console rather than the RF port on the rear of the unit. If that doesn't work then your problem is likely a loose connection inside, go back in and reassemble. I have had this issue with several consoles; these two solutions usually take care of it, though in rare cases a defective 72 pin connector was at fault even though it was brand new.
The nes does this to stop people from playing pirated games, but it can also be because the game cartridge or console is dirty. Try cleaning inside the game cartridge with a cotton bud dipped in a cleaning product of some kind. it mostly works for me!
It sounds like the pins on the game or the 72 pin connector in the console is dirty. Nornally the game connectors get dirty and when you put it in the console that transfers the dirt to the 72 pin connector. You need to purchase a cleaning kit from your local gamestop or other such store. Do Not Use Alcohol to clean your games or the console.
It's as simple as unscrewing the console by removing all the screws from the bottom. Once inside take off the metal piece over the area where the game is inserted. Once under there you can remove the two screws that hold the 72 pin connector in and pull it out and slip a new one in. Put it back together in reverse.