Surely it was impossible for that resistor to have existed AND a flush surface mount inductor present as well?

Likely a PCB that was also used for another Radeon product where the resistor existed but the inductor didn’t.

paradigital wrote on 2023-12-06, 18:28:

Surely it was impossible for that resistor to have existed AND a flush surface mount inductor present as well?

Likely a PCB that was also used for another Radeon product where the resistor existed but the inductor didn’t.

OK, thanks. The remaining inductor is flush with the board, so what you are saying makes sense.

A resistor in parallel with an inductor is used to reduce ringing in the circuit (a kind of parasitic oscillation when a voltage suddenly changes).

You really need to look at another 9800 to make sure what should be there.

The solder pads for that hidden resistor on my board look like they are unused.

I think shevalier might have the same card. can you look at the card from the edge to see if there is a resistor under the I1 inductor?

shevalier wrote on 2023-03-11, 16:22:

Zooming in, it looks to me there could be a copper trace between the resistor pads - if so, it should not be mounted.

Rwolf wrote on 2023-12-08, 01:12:

Zooming in, it looks to me there could be a copper trace between the resistor pads - if so, it should not be mounted.

I mounted the inductor without the resistor, powered up and I got a vga image! Yeah! but the fan was not running.

I powered down after about 15 seconds to fiddle with the fan, and couldn't get an image again when I gave it power again. Booo!

I'll get back to this projects after I finish blowing the tantalum capacitors off an 16K-64K 5150 motherboard. Terrifying little fire crackers, them yellow buggers are!