I have an Ice Tube Clock kit I built quite some time ago that has only recently developed a problem where after some minutes of operation, either the display will blank out, or it will emit a long beep and blank out. During these times, the fuse F1 will be noticiably hot to the touch.
After it has had time to cool off, the fuse resets as it should and it will allow itself to be plugged in, beeps on restart, appears to operate as normal, until the fuse heats up again and shuts it down.
This kit has been working normally running the stock firmware for some time (months), and has been sitting in my office relatively undisturbed, so an assembly error seems extremely unlikely. Nevertheless, I've disassembled the kit to examine the board for shorts and stray material under high magnification and not located any problems.
The voltage regulator is generating the proper voltage. I haven't attempted to remove IC1 or IC2 to attempt to read the high-voltage side (I understand it won't read correctly with at least IC2 in, correct?). I'm a little nervous about pulling that, I've had bad luck with destroying PLCC sockets in the past.
The only symptoms are F1 getting hot and the clock shutting down after a relatively short time of operation.
I'm wondering if I'm experiencing a problem identical or related to that in post http://forums.adafruit.com/viewtopic.php?f=41&t=16350&start=17#wrap
Any suggestions on how to repair my clock? I really do like it and would love to see it ticking away again!