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PostPosted: Sat Nov 14, 2015 1:04 pm 
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Forgive me if this is the wrong place to ask but i couldn't think of anywhere better to ask..

I just got an SNES mini. When i boot it up to say the Mario World start screen the picture kind of shimmys left to right slightly. It doesn't happen every time i boot. Maybe 1 out of 20 boots it wont do it. Using a CRT. Composite video. Power supply is official. Other consoles (AV Famicom and Genesis) work fine on the TV. I did try other av cables. Same shimmy. :/ I tried to capture it in a pic or video and it doesn't show up. The entire screen moves a couple mm back and forth very quickly. I opened it up and looked at the caps. Seem ok visually to my untrained eye heh.

Any ideas?

EDIT: I looked at the image more closely and the problem appears to be much more prevalent towards the top of the screen it that helps at all.


Last edited by SuperDerpBro on Sat Nov 14, 2015 9:37 pm, edited 1 time in total.

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PostPosted: Sat Nov 14, 2015 1:27 pm 
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CRT? Is it a standard resolution TV or is it an EDTV or HDTV?


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PostPosted: Sat Nov 14, 2015 2:30 pm 
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Just a normal res CRT. A newer 27 inch non hd flat screen and an old 20 inch curved.


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PostPosted: Sat Nov 14, 2015 6:23 pm 
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That's odd. Can you try S-video or RGB? I am just wondering where in this chain an instability might be introduced.

If it happens on either of the other connections, then you might be seeing a little bit of power line ripple, or your video connection is poorly grounded. If you want to get really experimental, run a conductor from something grounded on your TV (the outer rings of the RCA jacks will do) to an externally-visible ground on the SNES (there may be some visible on the bottom).


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PostPosted: Sat Nov 14, 2015 6:53 pm 
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SNES Mini does not have S-video or RGB . Other consoles work fine on the TV no problem. Same Input. So, if i did what you describe and the problem goes away... how would the problem be fixed?

Wouldn't the entire shielding be ground?


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PostPosted: Sat Nov 14, 2015 7:20 pm 
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Power line ripple "should" show up as a beat pattern, scrolling up the screen at one per 10 seconds (NTSC xtal, 60 Hz output).


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PostPosted: Sat Nov 14, 2015 9:29 pm 
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SuperDerpBro wrote:
SNES Mini does not have S-video or RGB . Other consoles work fine on the TV no problem. Same Input. So, if i did what you describe and the problem goes away... how would the problem be fixed?

Wouldn't the entire shielding be ground?

You're right, forgot about that on the SNES mini.

The shielding is an adequate ground, yeah. Maybe give forcibly grounding it a try.


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PostPosted: Sat Nov 14, 2015 9:37 pm 
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forcibly grounding?

I attached an RCA connector to one of the audio inputs of the TV and only connected the SNES video. While powered on i touched the other end of the audio RCA to the shielding and to one of the screws holding the board in the shell. No change.

I looked at the image more closely and the problem appears to be much more prevalent towards the top of the screen it that helps at all. The image looks outstanding for composite otherwise.


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PostPosted: Sat Nov 14, 2015 11:01 pm 
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SuperDerpBro wrote:
forcibly grounding?

I attached an RCA connector to one of the audio inputs of the TV and only connected the SNES video. While powered on i touched the other end of the audio RCA to the shielding and to one of the screws holding the board in the shell. No change.

I looked at the image more closely and the problem appears to be much more prevalent towards the top of the screen it that helps at all. The image looks outstanding for composite otherwise.

You'd have to touch the other end of the audio RCA's shielding ring to the shielding, otherwise you're just giving it ground as an audio signal. Maybe that's what you did, just not quite sure from the phrasing.


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PostPosted: Sun Nov 15, 2015 2:13 am 
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That is what i did....

EDIT: wait.. the ring.. not the point.. will try that

EDIT: OK.. when i do that the picture lightens slightly. Also, it very slightly moves to the left (until conductor is removed) and continues to do what i described in my OP :/

EDIT: Tried again with a different RCA cable .. this time nothing at all happened to the image :/


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PostPosted: Fri Nov 20, 2015 5:51 pm 
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Bump :/


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PostPosted: Mon Nov 23, 2015 2:25 am 
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Shamless bump :?


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