VOGONS


First post, by brian105

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I have a 9800 Pro that currently displays complete junk on the screen and R3memid says that all of the memory channels are bad. I looked at the card and these two components circled in blue (C261 and C684) that were knocked off.
(I have already cleaned up that bridge on C261.)
Additionally, there is a third component U100 that seems a little loose but still attached.
I know it’s hopeful to assume that these components are the reason the card doesn’t work, but I have no other leads. Does anyone have a similar card to measure the values of these parts?

Thanks in advance.

Presario 5284: K6-2+ 550 ACZ @ 600 2v, 256MB PC133, GeForce4 MX 440SE 64MB, MVP3, Maxtor SATA/150 PCI card, 16GB Sandisk U100 SATA SSD
2007 Desktop: Athlon 64 X2 6000+, Asus M2v-MX SE, Foxconn 7950GT 512mb, 4GB DDR2 800, Audigy 2 ZS, WinME/XP

Reply 1 of 1, by tehsiggi

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Both are 10µF 16V or more, high voltage rating due to the capacity derating due to DC bias for ceramic caps. Them being missing should not cause a lot of trouble to be honest. However if there are leftovers that short the voltage rails, that will affect all memory chips.
U100 important for one of the 4 memory channels, not for all of them. It should not affect the other channels.
Check the voltages of all main rails, see Re: Radeon 9800 Pro - repair

Cheers

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