I have just dug out a piece of kit that had been stowed away for several years.
Reason, it failed to work !
But i looked at it and done some basic fault finding and found an SMD fuse had blown.
Not having the correct rated fuse i stripped out a very small diameter length of wire from some flex, almost invisible. Soldered this across the pads and hey presto it works again.
However there remains a mysterious fault of 160ma drain from the power cells when the unit is turned off , the switch is not mechanical like a toggle , it is mounted on the pcb, more like a button.
Does anyone have any suggestions as to what might be the fault on this SMD component board unit.
Would the unit have any reason to draw current even when off
. or has something gone a kind of semi short .