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Well I had heard of the metal piece of the back of a super NES console round piece breaking off because it becomes loose over time periods or it can rust and then fall off. So to fix this problem you need to find another super NES console and swap the parts, if you find a broken SNES console with working internal parts you are able to switch the parts into the other one that you have and buy a bypass plug from Radio Shack the Source or circut city to put it back toghter. But it would be more easy to buy a new console and sell this one as it is.
If you are using an RF Switch, and notice the picture quality degrading (static or "snowy" picture), we recommend trying a different RF switch. For information on ordering a replacement, click here. If that doesn't solve the problem, your system will likely need to be replaced. Due to the age of the system and games, we can no longer offer factory repair. Please click here to find out what options might be available.
If your screen shows a blurry image it can be a few possible things (and only these things).
1. The first and most obivous problem is being on the wrong channel - for example, if you are on Channel 3, but the switch on the back of your system is set to channel 4, you'll see a VERY fuzzy picture; simple switch to the other channel and it will come in clear.
2. Now...assuming you are on the correct channel, does your television receive other pictures clearly (for example if you change to a normal broadcasting station and it is still blurry, then it is a problem with your TV and not your NES system). Another way to test is to simply switch TVs and see if the same picture problem occurs.
If 1 and 2 are not the problem, them we know the problem is with your NES system and this should be an easy fix.
If you are using an RF Switch, then it is most likely the pin on either end of the switch has become bent (or was bent and now is bent back) and will no longer give a clear picture. The easiest way to test this is find a set of AV cables (any av cables - these are the red, white, and yellow cables that often hook DVD players to television). Find a set and just take one of those ends and connect it to the side of the NES system into the circle that says VIDEO and take the other end of that same color and put it into your TV into the circle that says VIDEO (note that the colors don't always match up on the newer TVs, just make sure that if you are using the yellow end of the AV cable and plug it into the video on the NES that you plug the other yellow end of the av cable into whatever color on the TV says VIDEO! Then change your tv to the cannel for that AV slot (usually AV 1 or INPUT 1). Turn the nintendo back on and see if the picture comes through clearly - if it does, it means you had a bad RF switch and you can either get a new one, or just use AV cables instead!
One of the above problems IS the problem - I've repaired over 1000 NES systems and 95% of the time it's just a bad RF switch (so the AV cable test works best)
Taking your problem in a whole new direction, why don't you try purchasing an 8 or 9-pin (depending on the type of Genesis you have) DIN RCA cable. This will improve picture and sound, and you won't have to worry about malfunctioning RF converters. Your problem sounds like the RF adapters are inadequate.
i had the same problem, and it was the rf unit itself. to resolve this problem i went to radio shack and purchased a special connecter. one side is an rca (male) to rf (female). when attached to a standard peice of cable wire, it acts as an rf unit. Also works with the sega genesis. hope that helped
Courtesy of Nintendo Repair Shop, try this site out I heard they are pretty reliable. Sounds to me like a new connector is in order for your NES. They tend to go after a while and the connections get worn out. Here is the link:
first off flip your nes upside down and remove the screws to the cover of nes..... then flip your nintendo over and remove the cover.... remember you just voided your warranty for your nes..... then proceed to do the following:
find Chip 3193A and find the 4th pin on the left hand side near the blue coils. Remove or pull back the pin and your NES Will play Pal and NTCS games.