How to Repair your flashing light problem on your NES (Connector pin replacement)
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Connector pin replacement part - http://www.amazon.com/Connector-NES-Nintendo-System-Bulk-Packaging/dp/B002DLOM6C/ref=sr_1_1?ie=UTF8&qid=1388714539&sr=8-1&keywords=nes+connector+pin
The Nintendo Entertainment System Hi. I have found a way to flawlessly and safely repair those old, cranky NES consoles. Surely everyone who has owned the system has at one point seen the horrors that it can produce: power flashes, blue screens, grey screens... endless frustrations. Looking for FAQ's or answers on how to repair the NES almost always results in the cliched "dirt and grime" excuse, or the infamous "take your NES to your nearest Official Nintendo Repair Station". Arghhhhh!!!! Well, after some experimenting, (I'm not sure if I'm the first to ever do this,) I have come to the conclusion that YOUR NES IS NOT DIRTY, DAMMIT!!!! Blow on the cartridge? No. Use a cleaning kit? Doesn't work.
Indeed, worn out connector pins are almost always the source of the terrible blue screens. Luckily, I have found out why the 72 pin connector gets worn out, and how one can EASILY and SAFELY repair it oneself!
I'm sorry if I lack any diagrams, as I lack scanner access. I'll try to make it up as clearly as possible.
What you need:
1 Philips-head screwdriver
1 of those really small screwdrivers used to fix glasses. Make sure that its FLATHEAD!
That's it.
The NES bottom
Flip over your pitiful Nintendo. Unscrew the base of the console.
The top removed
Remove the gray plastic top to the console. You will see a shiny metal covering (used to filter RF noise.)
The shield being removed, and the exposed cartridge cady.
Unscrew and remove the metal shield.
The lone cartridge slot after the cartridge cady is removed
To make things easier, unscrew the entire black-plastic cartridge loading system from the motherboard. You may have to jiggle it out a bit; don't worry, it is pretty sturdy.
Now the 72-pin connector should be revealed in all of its glory. Before you get down to fixing it, here is the reason it breaks in the first place.
A closeup of the NES cartride slot
Each pin is designed like a spring. When a cartridge is inserted into the system, the pins are depressed, producing just enough tension with the game to get a signal. Nintendo made the NES so that cartridges would not have to be forcefully inserted. Although this is convenient, wear and tear on the poor connector pins is almost inevitable after 5 years of use. You see, after so many insertions, the pins do not return to their firm positions. Instead, they remain depressed even after the cartridge is removed. This results in a loss of connectivity between the game board and the connectors; the NES thinks that no game is present and gives you blue screens and power flashes.
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