VOGONS


First post, by Rikintosh

User metadata
Rank Member
Rank
Member

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 blog: http://rikintosh.blogspot.com
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 2 of 5, by Rikintosh

User metadata
Rank Member
Rank
Member

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.

Attachments

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

Reply 3 of 5, by Rikintosh

User metadata
Rank Member
Rank
Member

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 blog: http://rikintosh.blogspot.com
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 5 of 5, by quicknick

User metadata
Rank Oldbie
Rank
Oldbie
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...