Need help with indentifying components on a Radeon X850 AGP \ VOGONS

Need help with indentifying components on a Radeon X850 AGP

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First post, by Munx

Posted on 2021-04-29, 07:49

Munx Offline

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I was hoping someone could suggest what components I need to replace on this Radeon.

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There are a couple of resistors missing on the AGP and some other traces . What value would these be? From the size, I assume they are the same?

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There is also this weird component up top that's missing. It notes B79. What would this be? :

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Any input would be appreciated 😀

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Reply 1 of 4, by chrismeyer6

Posted on 2021-04-29, 19:20

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I sadly can't help with the other missing parts but that b79 looks like it might be a through hole component from the front of the board. Can you get a good shot of that area from the front side?

Reply 2 of 4, by Munx

Posted on 2021-04-29, 20:00

Munx Offline

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chrismeyer6 wrote on 2021-04-29, 19:20:

I sadly can't help with the other missing parts but that b79 looks like it might be a through hole component from the front of the board. Can you get a good shot of that area from the front side?

Its a surface mount part.

My builds!
The FireStarter 2.0 - The wooden K5
The Underdog - The budget K6
The Voodoo powerhouse - The power-hungry K7
The troll PC - The Socket 423 Pentium 4

Reply 3 of 4, by Benedikt

Posted on 2021-04-29, 20:22

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Munx wrote on 2021-04-29, 20:00:

chrismeyer6 wrote on 2021-04-29, 19:20:

I sadly can't help with the other missing parts but that b79 looks like it might be a through hole component from the front of the board. Can you get a good shot of that area from the front side?

Its a surface mount part.

Could that be an SMD ferrite bead?

Reply 4 of 4, by cyclone3d

Posted on 2021-04-29, 20:54

cyclone3d Offline

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Just took a look at my cards and the layout of your card is the same as a reference X850 Pro.

B79 is an inductor. No idea the value but it will be the same exact as B78 which is on front of the card exactly where B79 is on the back.

I initially thought that R355 was a 0-ohm resistor (jumper) but it is not. In-circuit, I am getting a reading of 8.5k the one way and 9k the other way which I am guessing is just a reading from other stuff in the circuit.

R16 is a 0-ohm resistor (jumper).

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