Author Topic: Dark Horizontal Lines  (Read 262 times)

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Offline CMiller

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Dark Horizontal Lines
« on: June 30, 2020, 10:03 PM »
When using my SD2SNES, I get a pair of dark horizontal lines that crawl down the screen slowly in an endless cycle. This does not happen with an actual SNES cart. Any ideas what might be causing this, and how it could be fixed? It's very unpleasant.

Online Richardragon87

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Re: Dark Horizontal Lines
« Reply #1 on: June 30, 2020, 11:30 PM »
When using my SD2SNES, I get a pair of dark horizontal lines that crawl down the screen slowly in an endless cycle. This does not happen with an actual SNES cart. Any ideas what might be causing this, and how it could be fixed? It's very unpleasant.

Is it by anychance the pan and scan cut off point where you can see more stuff than the retail game shows?
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Offline CMiller

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Re: Dark Horizontal Lines
« Reply #2 on: June 30, 2020, 11:46 PM »
No. I looked at this a little more and maybe this will provide more clues.

In a game, the lines are constant and perfectly regular in their roll from the top of the screen to the bottom. However, in the menu when you turn the console on, occasionally the lines are absent, and appear when I select the game menu. In fact, going through the menus causes the lines to jump around, and in some cases change thickness. Toggling any option seems to change them. However in game they are always the same.

Offline FeverDrive

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Re: Dark Horizontal Lines
« Reply #3 on: July 01, 2020, 04:54 AM »
Perhaps are you talking about electromagnetic interference?
Upload a video if you can to see the exact problem.
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Offline CMiller

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Re: Dark Horizontal Lines
« Reply #4 on: July 01, 2020, 05:48 AM »
Sure. Here's a video. Thanks for looking.

https://youtu.be/w7soclX-zHA

You can see it's not as much of a problem in the menus, but when you start a game it's very noticeable (particularly on the racer select screen). This does not happen with an actual game cartage.

Offline Relikk

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Re: Dark Horizontal Lines
« Reply #5 on: July 01, 2020, 01:52 PM »
Do you have another power supply to test with? The stock Super NES power supplies are getting old at this stage and some of them need recapping (including the console itself). The SD2SNES also draws more power than retail carts and those old, stock power supplies are sometimes not up to the task.

Offline CMiller

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Re: Dark Horizontal Lines
« Reply #6 on: July 01, 2020, 08:36 PM »
What should I look for in a power supply to make sure it's good enough? I'm not using an original.

Offline lee4

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Re: Dark Horizontal Lines
« Reply #7 on: July 01, 2020, 09:49 PM »
well that is problem

using aftermarket power adapter 9V @ 350MA

can cause stress due underpower  the game cart, controllers, accesstories, cpu & gpu all at same time

is not enough power for special chip games and flash carts like SD2SNES / FXPAK

Super Nintendo OEM power adapter is 10V @ 850 mA

Krikzz's snes underpower problem sd2snes youtube video
https://www.youtube.com/watch?v=yhxSkxZgcK4

« Last Edit: July 01, 2020, 09:54 PM by lee4 »
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Offline nuu

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Re: Dark Horizontal Lines
« Reply #8 on: July 02, 2020, 12:51 PM »
Also the plug must be center negative and of the right barrel size to fit.
Don't stray from the 10V output voltage, but output power could be a little more than the OEM adapter's 850mA since the SD2SNES draws more than most normal carts. Try one with around 1A (1000mA).

Having lots of accessories (like a multitap with 5 controllers) also increases power draw, and this together with an SD2SNES might be too much for the OEM adapter's 850mA (I haven't tried it though).
« Last Edit: July 02, 2020, 12:54 PM by nuu »