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SNES Power up issues.


Zuckerton

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I have a SNES that needs repaired. I've done repairs before and have replaced things such as the transistor and the pico fuse, but that doesn't solve the problem here.

When testing with a multimeter, I get voltage in the solder points at the DC jack, but they don't seem to travel any further. I'm not getting anything at the C30 and C31 points. When researching, I've seen a few people say that it's a decoupling capacitor, but they don't say the voltage that it is (well ONE place said that C31 was .01uf 50v, but nothing on C30. Is 31 positive and 30 is negative?) or how to replace it. There was one guy at Assembler Games (https://www.assemblergames.com/forums/showthread.php?53079-SNES-No-Power-%28not-fuse%29) that seemed to have had the same issue, but it got difficult to follow. He started talking about "anodes" and cathodes", but I'm not sure if it still pertained to the C30 and C31 points. Then said he replaced the diode (with a 1n4001), but never said what diode he replaced, so I'm not sure if it still had anything to do with those points.

I've been searching the internet trying to find any information at all on this. Console5.com doesn't even have the capacitor listed and that's where I usually go to find what capacitor I need to buy to replace in the consoles and handhelds.

Anyone have any information on how to go about replacing this part? Any help (even if it's just to pointing to another forum) would be greatly appreciated.

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I should also mention that my board is the model SHVC-CPU-01. While looking at a schematic for the other board types, I noticed "T1" and I saw much discussion about T1, which isn't labeled at all on my board. T1 (according to this guy http://nfggames.com/forum2/index.php?topic=3778.0) is a "Common Mode Choke", which I've never even heard of.

I have three Super Nintendos. One has a bad fuse, but still gets a reading on the CMC, the other has a bad transistor, but gets a reading at the CMC, but this one doesn't get a reading at the CMC. So I will order a new one and hopefully that'll be the end of it.

I'll update this if it works, in case someone else has the same issue.

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Replaced the Common Mode Choke, but still not getting anything. After doing some more research, I found that C30 and C31 are Multi-Layer Ceramic Capacitors. I used my multimeter to check them and I'm getting continuity at C31, but not at C30. The good news is that MLCCs are really cheap ($5 for 200), the bad news is that they are pretty difficult to replace.

Once again, I'll update this just to keep it documented for the next person that has Power Issues that don't involve the DC Plug, Connector, Fuse or Volt Regulator.

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