A7V333 screwdriver mishap... 0 ohm resistor network? \ VOGONS

A7V333 screwdriver mishap... 0 ohm resistor network?

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First post, by hydroksyde

Posted on 2019-05-04, 09:45

hydroksyde Offline

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Joined: 2018-10-20, 10:18

So I have this Asus A7V333 board I was intending to use for an AthlonXP build, but after a screwdriver mishap while removing the CPU cooler it no longer POSTs and reports "system failed memory test" from the PC speaker.

Had a colleague of mine take a look under the microscope and he noticed RN36 has a crack. I'm not entirely sure what this is but given the other side, and other nearby similar looking components read less than 1 ohm between opposing pins, I suspect it might be a 0 ohm resistor array. Does anybody know if this is correct?

Reply 1 of 2, by Deunan

Posted on 2019-05-04, 10:14

Deunan Offline

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RN most likely stands for resistor network, and these would be there to match the line impendance and/or help terminate the line and prevent ringing and under/overshoots from getting too big. At this frequency the resistor values have to very low, so while maybe these are not 0ohm, you should be able to get the board to work again by just bridging the damaged pack afer removing the cracked leftovers. Very short wires to nearby vias might just work too but forget about routing a separate wire from the CPU socket to the chipset/RAM slots.

I've repaired one XP mobo where someone cut 2 traces with a screwdriver stab. I had no components to replace, "just" to fix two traces with 2-3mm of thin copper wire, and I've had a bit more room to work with if only barely. So... good luck with this one.

Reply 2 of 2, by Arctic

Posted on 2019-05-04, 12:56

Arctic Offline

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I have an A7V333 and a multimeter, but not a lot of spare time 🙁

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