SNES won't turn on

Discussion of hardware and software development for Super NES and Super Famicom.

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marcorosa13
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SNES won't turn on

Post by marcorosa13 » Sun Dec 13, 2020 6:05 pm

I Came with another challenge!
I've got another SNES GPU -02, doesn't turn on!
And the S-WRAM IC turns hot!
The voltage is 2.78V in each IC I test!

The problem results after I changed all the capacitors!
I check te regulator and it's okey, the fuse, in the same way!
The power supply it's okey!

In other forums tells me, there's a short circuit in the PCB, and I can't find it
Some tips?

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TmEE
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Re: SNES won't turn on

Post by TmEE » Sun Dec 13, 2020 8:54 pm

The WRAM chip needs to be replaced, it has an internal short that cannot be fixed. When you desolder it, you'll probably gain 5V everywhere gain but RAMless machine will not work...

tepples
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Re: SNES won't turn on

Post by tepples » Mon Dec 14, 2020 3:28 pm

Can the S-WRAM be replaced with a commodity RAM behind some CPLD implementing the "all banks but $7F are $7E" behavior and whatever is needed for the autoincrementing port on the B bus?

lidnariq
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Re: SNES won't turn on

Post by lidnariq » Mon Dec 14, 2020 3:37 pm

Of course? But no-one's already done that.

The hard part is probably footprint matching, but there's been some clever things I've seen lately with castellated PCBs going to a vertical connector and a mezzanine board. (e.g. N64 PIF replacement)

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