At the risk of being suuuuuper obvious, I'd check that 12V connector that wiggled when you leaned over! If it were me, my first thought would be to wonder if one if the solder joints on the 12V connector were all solid to begin with. I don't think they're supposed to wiggle all that much!
Michael WD0OM
On Thu, Sep 19, 2024, at 19:10, Steve MW0KST wrote:
After successfully building and tuning my QMX+ (V2 PCB), after a day's use I've done it again and blown something up! I managed to accidentally 'wiggle' the 12V connector with the radio on while leaning over it and trying to plug in a PC monitor (to something else!) - in other words, I was being careless.
?
The rig was connected to a power speaker, so a few loud crackles from that, then it was dead.?Now when I reconnect to a current limited PSU, pressing the on switch on the top encoder causes the supply voltage to short to ground somewhere. So something's blown that shorts the 12V line - I think.
?
With the 12V supply shorting as soon as I press the 'on' button, nothing powers up at all - it's completely dead.
?
No signs of damage or burnt components found, tracks all look ok and no familiar burnt plastic smell. I've checked all the diodes and components around the integral SMPSUs - all seem ok.?
?
If anyone has any pointers on what to look out for, any info. on what to check next would be appreciated!
?
Many thanks,
?
Steve MW0KST
?
?
