Help trouble shooting a QS board
rwgast_logicdesign
Posts: 1,464
Ok I was planning on using my only QS board to power my sting ray. I think I killed it, it is not a huge issue except for it is the only one I own and I had started setting up the other electronics around that 40 pin header. So basically I'm hoping it can be revived but if not, well there are other options. I always hated this board for experimenting to tell you the truth, but now that it is gone I miss it, nothing else fits in an Altoids tin 
Ok so here is the deal, I had a 12V battery grounded to the board. Basically I've been connecting this battery using some stereo wire, and the positive lead hit the voltage regulator and made a little spark, the QS was unplugged from USB at the time. I plugged it in, opened the prop tool and tried to program it, only to get the dreaded propeller not found on COM 11! Next I tried my Prop-BOE to make sure it was not an issue on the PC side, BOE worked just fine. After I established it was indeed the QS board, I started probing voltages, and found the regulator was now outputting 3.8V. So I de-soldered the regulator then soldered a wire on the USB ground, and one to the regulator out. I then connected those wires to a 3.3v supply. Still no propeller found.... So in my head im thinking that 12V went straight down the line to the prop's VDD pins... but when I probe the propeller with a meter some of the pins are still hi from whatever the last program I ran was, not only that when I hold reset those lines pull low and then go hi again as normal. Im thinking if the prop was fried reset would not work and I the prop wouldn't be running whatever code was last programmed to it?
The FTDI chip seems normal, the red and blue LEDs light up as always and my computer sees it as a USB to serial device.
So anyone think they know what is actually going on here? Like I said it is not of the utt most importance I revive this QS, but if I don't I will have to put my project on hold until I can order a propeller project board, with that same 40 pin header, or until I solder some dip based solution together.
EDIT:
Ok well it seems as if the acuall prop chip is what is blown. I soldered a solid 3.3v power source in place of the regulator, then I tried to program the board using a prop plug, no good. I also hooked an LA up on the eeprom lines and there was no signal on boot up. I find it very strange the reset still work though..
Ok so here is the deal, I had a 12V battery grounded to the board. Basically I've been connecting this battery using some stereo wire, and the positive lead hit the voltage regulator and made a little spark, the QS was unplugged from USB at the time. I plugged it in, opened the prop tool and tried to program it, only to get the dreaded propeller not found on COM 11! Next I tried my Prop-BOE to make sure it was not an issue on the PC side, BOE worked just fine. After I established it was indeed the QS board, I started probing voltages, and found the regulator was now outputting 3.8V. So I de-soldered the regulator then soldered a wire on the USB ground, and one to the regulator out. I then connected those wires to a 3.3v supply. Still no propeller found.... So in my head im thinking that 12V went straight down the line to the prop's VDD pins... but when I probe the propeller with a meter some of the pins are still hi from whatever the last program I ran was, not only that when I hold reset those lines pull low and then go hi again as normal. Im thinking if the prop was fried reset would not work and I the prop wouldn't be running whatever code was last programmed to it?
The FTDI chip seems normal, the red and blue LEDs light up as always and my computer sees it as a USB to serial device.
So anyone think they know what is actually going on here? Like I said it is not of the utt most importance I revive this QS, but if I don't I will have to put my project on hold until I can order a propeller project board, with that same 40 pin header, or until I solder some dip based solution together.
EDIT:
Ok well it seems as if the acuall prop chip is what is blown. I soldered a solid 3.3v power source in place of the regulator, then I tried to program the board using a prop plug, no good. I also hooked an LA up on the eeprom lines and there was no signal on boot up. I find it very strange the reset still work though..