I have managed to remove 4 FET's (igfets) from an sd board with my trusty old Weller soldering gun. Are the pads on the boards heat sinks or just connection points? I am thinking I might damage the new parts by overheating on installation so I was thinking of just tacking them to the pad and adding heat sinks on top using thermal adhesive. Sound like a good plan? I don't have an air station so I have to use my iron (50W adj temp control) and 100 wat weller gun.
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Re: General question about sm FET's
both connection and the heatsink. I used an 80W iron, tinned the transistors and used flux. Went ok, not as pretty as factory. -
Re: General question about sm FET's
I'll do it that, if it fires up, then I'll add the heat sinks anyway, as I see it, the cooler the better, and I already have them. I want it to last if i resell it.Comment
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Re: General question about sm FET's
I doubt you can overheat them. I've done many MOSFET swaps on motherboards and video cards and all I can say is, these boogers are real tough. As long as you don't damage them by breaking a leg off, they are fine. I even removed a bunch with a blow torch (the donor motherboard had serious trace damage, so not like I cared about it). Got the cases on those MOSFETs charred pretty badly too. But after a quick alcohol wipe, I tested them and they were perfectly functional.Comment
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Hi guys
I've been getting more air con controller boards of various brands for repair - mainly the ones from the outdoor compressor unit and I realise I have a lot of gaps in my specific knowledge, while being pretty good at electronic repair in general.
Does anyone know of any good resources for information on this sort of repair? I'm hoping here there will be some guys who are experienced in this. I'd specifically like more info on how the controller PCB works, because I expect they are all pretty much the same, and especially how it communicates with the indoor unit (protocols,... -
A very general question, when inject voltage and board draw over 4a and pull down 5v to 1v, but nothing is hot under thermal camera. Can I assume it is layer short? or it could be something very typical that I just have no idea of being a noob. -
I'm not sure if I am posting this in the right spot, I don't have any question or anything specific to one board. I am *kinda* starting out with this kind of work. I have been IT in one role or another for my job the last 30 years, and I am familiar enough with basic board stuff generally speaking. So, I dunno for example if someone told me to find a uart header, or flash some generic tsop8 something, etc I understand that kind of stuff. Point being, I'm not 100% clueless. I just don't have the specific knowledge when it comes to some of these more advanced repairs. I actually have spent the last... -
Hi guys,
Just a general question. Usually on mobile devices/laptops the battery pack consists of lithium ion cells with their +/- tabs welded onto the controller IC. I'm wondering, in general if it can be assumed that one can find a replacement lithium ion cell, is it ok to simply re-use the old controller IC in an attempt to re-build the pack? Or is that controller somehow paired to the cells from the factory?
From my experience it sometimes seems to be hit or miss. Not sure if this is true, but sometimes it's almost as if the controller IC will go to a failsafe... -
Someone gave me two of these 100/140w weller soldering guns. Yes, I know it runs current right through the tip, but might be nice to really get some heat into some big wires that need to be soldered.
So, worth a place on the bench, or chuck it?
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