Fried my SNES, what now?

lokomelo

Edson Arantes do Nascimento
OP
Member
Joined
Aug 19, 2009
Messages
1,369
Trophies
0
Age
35
Location
São Paulo
Website
3ds-style.blogspot.com.br
XP
1,483
Country
Brazil
This weekend I was messing with some old SNES boards that I have. Accidentally I shortened the inpult and output legs on the 7805 voltage regulator, basically sending a 12v current inside and something burned (no image).
I have some spare pico fuses and I can get a 7805 regulator from a dead board I have, I'll start with those, but I'm guessing that it will not solve, as the fuse seems to be before the regulator, and the 12v current was delivered to the output leg, so, after the regulator.

So my question is, where I should begin investigating? and how badly I messed up?

Thank you in advance!
 

tech3475

Well-Known Member
Member
Joined
Jun 12, 2009
Messages
2,530
Trophies
1
XP
3,278
Country
Probably start by getting a schematic and testing continuity/voltages using a multimeter.

If components are bad start replacing the components you can.

If they’re fine, test with a game you don’t care about. Do basic cartridge diagnostics e.g. clean the contacts, if nothing appears.

If that doesn’t work, well it becomes more complex and possibly a ‘not worth it’ case depending on your skills/access to tools/parts.

Do you have an oscilloscope? If so then you can check for things like CPU activity, video output, etc.

I wouldn’t give up hope just yet, I accidentally plugged a 9v transformer into a 5v device a few weeks back, thankfully despite some smoke it still seems to work.
 

lokomelo

Edson Arantes do Nascimento
OP
Member
Joined
Aug 19, 2009
Messages
1,369
Trophies
0
Age
35
Location
São Paulo
Website
3ds-style.blogspot.com.br
XP
1,483
Country
Brazil
Probably start by getting a schematic and testing continuity/voltages using a multimeter.

If components are bad start replacing the components you can.

If they’re fine, test with a game you don’t care about. Do basic cartridge diagnostics e.g. clean the contacts, if nothing appears.

If that doesn’t work, well it becomes more complex and possibly a ‘not worth it’ case depending on your skills/access to tools/parts.

Do you have an oscilloscope? If so then you can check for things like CPU activity, video output, etc.

I wouldn’t give up hope just yet, I accidentally plugged a 9v transformer into a 5v device a few weeks back, thankfully despite some smoke it still seems to work.
I looked the schematic, and looks like I got a big trouble for me, maybe my board is gone.

https://wiki.superfamicom.org/uploads/snes_schematic_color.png

this is the schematic. The component I shorted out is the yellow square on top (slight to right). I don't understand nothing about electronics, but looks like the thing is called "VCC" after the voltage step down. This VCC appears everywhere, literary everywhere, so my 12v shock-wave touched tons of components, maybe fried more than one (and a lot of those are too small).

I'll try the regulator swap, but right now I have no hopes :(
 

lokomelo

Edson Arantes do Nascimento
OP
Member
Joined
Aug 19, 2009
Messages
1,369
Trophies
0
Age
35
Location
São Paulo
Website
3ds-style.blogspot.com.br
XP
1,483
Country
Brazil
last update

this weekend I got time and I FIXED IT!!! The voltage regulator and the fuse were burned, change it, there was also a capacitor (maybe this one was already broken, maybe not).

when I was testing, seems that everything is 5v except the very start of the circuit. I dont know where the 10v is used, but maybe it is easy to change the SNES to USB standard for power. I'll not try that so soon tho.
 
General chit-chat
Help Users
    Psionic Roshambo @ Psionic Roshambo: https://youtu.be/A52--FKUQgU