Reply 24460 of 25366, by TheAbandonwareGuy
appiah4 wrote on 2023-06-06, 08:31:TheAbandonwareGuy wrote on 2023-06-05, 19:55:
I somehow created a card that blew out the AGP port on my test rig by attempting to reflow the VGA port on a GF2Mx that had a dead blue channel.
There are no solder bridges I can find... I'm honestly more dumbfounded than angry. Like how does reflowing the VGA port cause the card to blow up the AGP port? As soon as I turned the PC on I got the magic smoke from near the front of the AGP port. Now it doesn't even recognize when a AGP card is installed, still boots off the integrated graphics.
Kind of sucks, the nForce2 with Integrated GF440Mx graphics motherboard in that thing is kind of rare, but I have another one held as spare so no big loss to me personally and that IS sort of the job of the test rig, to fall upon its sword in place of a more unique machine if something goes horribly wrong.
You probably did not reflow it smoothly enough. With an uneven solder surface on any voltage rail of the edge connector it would have created a loose connection between the card and the slot, which would in turn create a point of near infinite resistance between the card and the voltage source. V = i x R so the card will try to draw that current through the infinite resistance and cause both overloading of the PSU and overheading of the port destroying the card, the port, and the PSU or some combination of them.
AGP interface is clearly OK as the Integrated 440MX still works
Board otherwise works.
So just the physical port itself. I suspect the card too but its a card with a value of $10, so needless to say I'm not offering up another board to the GPU gods to find out.
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