VOGONS


First post, by Rikintosh

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I have a board with a damaged coil and voltage regulator, but I don't know their model to replace

Take a look at my retro blog: https://rikintosh.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 1 of 5, by cyclone3d

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Post pics.

Yamaha YMF modified setupds and drivers
Yamaha XG resource repository - updated November 27, 2018
Yamaha YMF7x4 Guide
AW744L II - YMF744 - AOpen Cobra Sound Card - Install SB-Link Header

Reply 2 of 5, by Rikintosh

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I could identify something.

I have a radeon 4870 that will serve as a parts donor, as it is the "closest" card I have to the 3850

Currently the 3850 is without any power, the chipset does not heat up, I haven't checked the depth yet, but these poorly soldered pwm indicate that someone has removed them before, I haven't tested the continuity in the cracked inductor yet, but I believe because of the rust mark it will need to be changed

The former owner said that there was a problem with the PSU and that his motherboard was also damaged.

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Take a look at my retro blog: https://rikintosh.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 3 of 5, by Rikintosh

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Ok, I removed the components from the board, and I checked it, and the cracked coil is ok, just like the D472. The D412 apparently is damaged, my problem now is figuring out its function, as the Alpha Omega D412 description is very vague, there are several transistors with this description but they are internally different.

I know that on video cards, the overwhelming majority of transistors are N-Channel Enhancement Mode Field Effect Transistor, but I can't just deduce and put something there to try my luck, as the wrong component can do more damage.

Take a look at my retro blog: https://rikintosh.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 5 of 5, by quicknick

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Rikintosh wrote:

Does anyone here have the Radeon 3850 agp schematics diagram?

I'm looking for the 3850 agp schematic too, not even paid sites seem to have it.
I have one card that's (mostly) working, but only displays through DVI-VGA adapters, digital output seems dead.
Recently sourced a second card, but this one prevents the computer from POSTing...