Snes not working right.

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mvsfan
Posts: 1209
Joined: Sat Oct 06, 2012 12:24 am

Snes not working right.

Post by mvsfan »

I just bought an snes with strange symptoms.

It takes a couple minutes of warm up before the game will boot when you first turn it on.

then everything plays fine. I can turn it off and then back on again and it will just boot right up.

if i Leave it off and it gets cold, then it wont boot again for a while.

Its not the capacitors. I already replaced them.

Cartridge slot was just cleaned.

7805 tests ok.

It has the Cic disabled.

I also checked the reset switch.

Im thinking it might have something to do with the part labeled T1, but i dont know how to test that.
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Voultar
Posts: 550
Joined: Fri Jan 10, 2014 8:29 pm
Location: USA

Re: Snes not working right.

Post by Voultar »

Power filter cap or other cap issue?
mvsfan
Posts: 1209
Joined: Sat Oct 06, 2012 12:24 am

Re: Snes not working right.

Post by mvsfan »

the caps are brand new nichicons. i just put them in.

The power supply also has a new filter cap.

it was doing the same thing before i replaced them.
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Voultar
Posts: 550
Joined: Fri Jan 10, 2014 8:29 pm
Location: USA

Re: Snes not working right.

Post by Voultar »

mvsfan wrote:the caps are brand new nichicons. i just put them in.

The power supply also has a new filter cap.

it was doing the same thing before i replaced them.

When you "cold start" the system. check the amp load on the 5V rail coming off the 7805. Wait a couple of minutes (keeping the system on) and check the amp load again.

Is there a change?
mvsfan
Posts: 1209
Joined: Sat Oct 06, 2012 12:24 am

Re: Snes not working right.

Post by mvsfan »

right up until the point when it kicks on and boots the game and i get the title screen, The amps stay at 0.

when it kicks on the multimeter starts flashing the -sign still reading 0 or close to 0.
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