radiokid
n00b
- Joined
- Jul 30, 2016
- Posts
- 25
In my quest to fix my other Neo Geo (which is now fixed) I bought second faulty system.
Turns out I've bagged an original 5v model, low serial number 19k or there about.
The system powers on fine, just needed a 5v PSU. I was worried he might have fried it with a higher voltage PSU. But I am wondering if my third party PSU isn't good enough, it's rated at 5V 3A but I can't confirm the current. I only get between 4.65 - 4.75v on the cartridge VCC pins and various other VCC points on system chips (B0, BIOS, LSPC0). I also spotted what I think is a 3 pin voltage regulator, not sure which pins should get what voltage but I measured two of them at 4.65 - 4.75v and the other one nearer to 4v.
I am wondering if that low voltage could be the cause of the below issue related to the power switch/reset switch.
When I press reset (and very very occasionally on switch on) I get a scrambled Neo Geo logo, either slightly thinner text, vertical lines, mirrored parts of the logo. If I let the game boot most of these issues persist in game as well. If I hit reset a few more times I can get it working perfectly, and it will stay working perfectly until I press reset again (I confirmed this by leaving games running for a hour).
Turns out I've bagged an original 5v model, low serial number 19k or there about.
The system powers on fine, just needed a 5v PSU. I was worried he might have fried it with a higher voltage PSU. But I am wondering if my third party PSU isn't good enough, it's rated at 5V 3A but I can't confirm the current. I only get between 4.65 - 4.75v on the cartridge VCC pins and various other VCC points on system chips (B0, BIOS, LSPC0). I also spotted what I think is a 3 pin voltage regulator, not sure which pins should get what voltage but I measured two of them at 4.65 - 4.75v and the other one nearer to 4v.
I am wondering if that low voltage could be the cause of the below issue related to the power switch/reset switch.
When I press reset (and very very occasionally on switch on) I get a scrambled Neo Geo logo, either slightly thinner text, vertical lines, mirrored parts of the logo. If I let the game boot most of these issues persist in game as well. If I hit reset a few more times I can get it working perfectly, and it will stay working perfectly until I press reset again (I confirmed this by leaving games running for a hour).