Came downstairs this morning, and immediately i smelt that familiar smell of toasted electronics ;-(
Turns out my EE Brightbox router has let the "Magic smoke" out........
So, as i couldn't turn it on, i took it apart!
Looks like one of the dc-dc convertors has cremated itself. There look to be two in parrallel, possibly one for 3.3v and one for 1.8v i'd guess.
More worrying, it looks like there has been a "costdown" carried out on the board, and a lot of footprints are unpopulated, including, what looks like to be the dc-dc freewheel diode!!!
In that pic, i'd expect D113 to be the free wheeling diode (it's a large footprint for a large diode) and there also seems to be a marked lack of filter caps around the dc-dc as well.
I wonder if EE are going to be getting a whole lot of these things back in the near future? (they are sending me out a new one btw, so good service from them). Mine has been on and running pretty much continuously for a couple of years now, so there may be a LOT of these devices approaching a similar failure (wonder if it is an over voltage high cycle failure in the switching FET, as without a freewheel diode, that is going to potentially be seeing some voltage excursions etc?)
I've also been trying to work out what the IC is that has gone bang, it's labelled:
8958BG
C16931A
it's a soic8 package. No sign of a seperate FET, so must have an integral power switch
Any guess anyone?