blue smoke pixies

[carlosspicyweiner]

W1209 temperature controller

Can't work out how I fried my circuit board.

-hooked up 12v +/- to mini fuse board (fuse removed), rest of system running.
-blue smoke, zap
-certain I did not short the wiring, or short to any other part of system.
-noticed the fuse board has LED which comes on when fuse is blown/missing
-didn't notice voltage reads 1.9v across +/- fuse board with no fuse
-is it simply because I was, in effect trying to power the board with 1.9v?

Yes I usually turn things off when installing new bits, was kinda in a hurry. If the above was the problem do I need to use a specific type of fuse board for this type of application?
*Just remembered - hooked up a LED bar afterwards, worked fine, pulled the fuse and the led bar still glowing faintly..now i'm thinking that isn't right and my fuse bar is janky?
any thoughts? cheers.

 

[Texas-Mark]

*Just remembered - hooked up a LED bar afterwards, worked fine, pulled the fuse and the led bar still glowing faintly..now i'm thinking that isn't right and my fuse bar is janky?

Those fuse blocks with an LED will still pass a little current through the LED. I had a block like that and snipped out the LEDs to prevent that issue.

That should not have cooked your board unless you had it wired wrong.