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Old 08-11-2015, 08:45 PM
Bassplayer Bassplayer is offline
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Default Repairing a Rampage Extreme - Blown MOSFETS

Hi all, hoping you can help here. I received a REX in the mail and it was badly damaged from shipping. I straightened all of the bent fins and plugged it in to try to test it. Not surprisingly, it would not power on. The lights on the board pulse as they do when in standby as normal, but pushing power does nothing (tried using front panel header as well--no luck there either).

I noticed when I was taking it apart to look for physical damage that there was a slight smell of burnt electronics near the CPU VRM. I've had a board blow on me and it was nowhere near as strong, more like it had happened in the past.

I decided to check the MOSFETs for continuity and pulled out my trusty DMM to measure resistance. All measure 0Ω on source to sink and all measure ~10KΩ on gate to source except one phase--both FETs measure 0Ω. There was no visible damage here. It didn't look melted at all.

I was planning on ordering the NCP 9025L and 5525L on Ali Express to ship from China (Neither Mouser nor DigiKey seems to carry them... must be too old).

Since both FETs are burned out I was thinking the problem was further up the line. Any suggestions on what else I should check?

I can take photos if nexessary, but here are two reference photos:

Dead phase is at the top rightt:


Top left here:
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Old 08-11-2015, 11:00 PM
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TiN TiN is offline
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You can remove broken FETs and try without them first. It usually can work without a phase
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Old 08-11-2015, 11:22 PM
Bassplayer Bassplayer is offline
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Oh cool! I'll try that... Thanks!

EDIT: Fets are removed... Waiting for the board to cool down before attempting to boot. Don't have a rework station so I improvised.



Was originally set up like this but eraser burns lol:


Final result:


Last edited by Bassplayer; 08-12-2015 at 12:08 AM.
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Old 08-12-2015, 12:33 AM
Bassplayer Bassplayer is offline
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TiN, you're a genius!!!!!

How gimped would you say it is? Worth it to replace the fets? Looks like it would be pretty difficult since some of the pads pulled up when removing the originals.

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Old 08-12-2015, 02:00 AM
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I'd suggest putting good fets back, but seem's your airgun butchery paid off not well, you peeled gate pins. Try to trace gate back if via nearby still ok, and put an improvised pad with little wire or thin copper foil.
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