Quote from: J4bberwock on May 26, 2014, 03:37:09 PM

Quote from: ktbken on May 26, 2014, 03:13:39 PM

Hi
I have 3 mildly over clocked blades which have been running fine until today when one of them has blown on both blades the ferrite bead marked (what is the "a" for) afb26 next to the usb connector.
Needles to say they don't work any more Sad

does anyone have any idea of A/ what the spec is for that component is and B/ The hard one any idea why this may have happened.

The other 2 are hashing fine.

Ken

overheating can cause many components to fail.
the other reason is a short somewhere on the board.
maybe the upper gate mosfet could have died.
check for continuity between pin 4 (gate) and the 4 pins soldered to the same pad (drain).
It's been explained in the 5chips pod thread
https://bitcointalk.org/index.php?topic=519112.msg6722468#msg6722468

on the later blades, gridseed replaced the ferrite beads with zero resistors of the same 1206 size

Well one is back working using one of the fb off of a bad 5 chip and all seems to be fine with it.
Next to bypass the plugs and solder direct to pcb for power and moooreeee heat sinks

)