Fets melting???

[hhnguyen504]

Hey guys this is my first post on the forum. I have been browsing for answers but I have one that i could not find.

Well, the thing is... I bought a 2x2 stacked fet evo board from ebay and its been working fine. I installed everything according to the wiring diagrams and whatnot and drove it with a Tamiya Sprint Dash motor (very fast even for stock electronics very recommended) but after a whiles my car stops going forward but still really fast in reverse. (I switched hand orientation and drove backwards for a while.) After taking it inside to inspect it, it seems the the solder holding the fets melted off. (I found solder that shot across the board and found one side bridged and the second fet not even connected anymore.) I have resoldered the fets thinking it was bad workmanship and it worked again. I ran it again last night, melted, resoldered, ran it a little just earlier, melted again. I'm really not sure if the second fet still even works since the Sprint Dash motor works on stock fets anyways. Is there a way to check?

I tried "insulating" my motor connectors thinking that they might have melted the fets but it still melts. I'm wondering if there's some other reason that may cause the fets to melt off like that. Please help guys. If the Sprint Dash motor is causing this, I bet the Plasma Dash will too. (FYI the ebay seller was supracing.) Thanks in advanced.

[bigez]

well you bought it off of ebay and those are not the best ones to get and are made in mass amounts and aare not made very well and the fets are not the best you can buy it is just the fet that is bad there are the cheap ones if you get better one you will not have that problam it happen to me too

[Donziikid]

Most solder has a high melting range of up to 480*F, and I'm quite sure your FETs are not getting that hot and nor are the FET pads. You must be using some bad solder or something.

It sounds like the solder, not the FET.

[hhnguyen504]

Hmm... I guess I may have to try to unsolder them and use my own solder. I really wouldn't know what he used. I might consider getting new ones, too. Can you guys recommend a place i can get some for fairly cheap? (College student around Christmas time. =P)

[BART]

Originally Posted by bigez

well you bought it off of ebay and those are not the best ones to get and are made in mass amounts and aare not made very well and the fets are not the best you can buy it is just the fet that is bad there are the cheap ones if you get better one you will not have that problam it happen to me too

Your advice may be easier to decipher if you use punctuation.

Anyways, I agree with donzi.

[Donziikid]

Originally Posted by hhnguyen504

Hmm... I guess I may have to try to unsolder them and use my own solder. I really wouldn't know what he used. I might consider getting new ones, too. Can you guys recommend a place i can get some for fairly cheap? (College student around Christmas time. =P)

www.AtomicMods.com

Trustworthy. Quality. Great customer service.

[XMDrifter]

atomicmods is bit expensive, but you get what you pay for unless you can make it yourself.
soulds like it might have been stuck on with cheap solder.

[hhnguyen504]

Thanks guys. I've resoldered them last night and tested it this morning and everything seems fine so far. I'll let you know if it occurs again.

Atomicmods IS expensive... but he's sold out right now. I don't plan on doing any hardcore xmoding that will need a Spider or a V2 board so I probably won't need the power.

[deckerz]

i was gonna say wire glue from xi but if the solders melting then it may catch fire, hmmm...... buy 12 new upgrade fets, do 3x2 stack on stock board and on melter and if it still melts just do transplant.