I've got a EDM-030 board that has a short on the 5v rail.
I removed all the fuses that take in 5v F7001, F7002, F7003, F7502 which seems to have isolated the short to the entry of all those fuses, which doesn't leave me very many places to look.
I removed the MOSFETs that generate the 5v, still short before I removed the MOSFETs, I was getting 0.16v or something really low.
I decided to do some voltage injection since we've no fuses left to blow (lol), I put it at 1v and 2a, for some reason it will pull the full 2amp but at only 0.2v which is rather strange, I cannot find anything heating up, put a lot of IPA around the board and don't see anything obvious (I do not have a thermal camera but I should sometime this week).
Could I risk pumping more amperage into it? Since really it's only burning 0.4w of power, which I doubt is enough for a significant heat burst.
This board is driving me a bit mad, running out of things to pull off the board, the board is pristine so very unlikely a trace is short.
Does anyone know where the 5v goes excluding fuses mentioned? Should I remove the USB switch ICs too?
Another strange symptom of this PS before I dismantled it, it'll not take the full 12v, usually around 11.6 or a slight bit under, which is unusual.
I removed all the fuses that take in 5v F7001, F7002, F7003, F7502 which seems to have isolated the short to the entry of all those fuses, which doesn't leave me very many places to look.
I removed the MOSFETs that generate the 5v, still short before I removed the MOSFETs, I was getting 0.16v or something really low.
I decided to do some voltage injection since we've no fuses left to blow (lol), I put it at 1v and 2a, for some reason it will pull the full 2amp but at only 0.2v which is rather strange, I cannot find anything heating up, put a lot of IPA around the board and don't see anything obvious (I do not have a thermal camera but I should sometime this week).
Could I risk pumping more amperage into it? Since really it's only burning 0.4w of power, which I doubt is enough for a significant heat burst.
This board is driving me a bit mad, running out of things to pull off the board, the board is pristine so very unlikely a trace is short.
Does anyone know where the 5v goes excluding fuses mentioned? Should I remove the USB switch ICs too?
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Another strange symptom of this PS before I dismantled it, it'll not take the full 12v, usually around 11.6 or a slight bit under, which is unusual.
Last edited by aidanisme,