Probing for voltages I get 5v out of the USB through the associated filter components and the mosfet as normal. 5v However when I go to the U21 voltage converter section things fall apart. There are the two pairs of two 10 uF capacitors there. One pair is on the the 1.8v side and one pair is on the VCC side. The pair on the VCC are both indicating continuity to ground. The 1.8v pair do not. I probed further and discovered the entire VCC BUS is indicating continuity to the ground which of course makes sense being it's a BUS.
I guess I will pull the two VCC u21 caps and see if the BUS is still clamped. I'm just at a loss right now as to what could be causing a dead short to ground and where in the entire BUS it exists. Also, prior to realizing this condition I noticed the U21 converter emitted a very slight high frequency whine when I probed the two aforementioned VCC BUS caps near it while the unit was plugged into the USB port. I assume this means the converter is at least alive and trying to produce the proper voltages? I'm kind of surprised the computer doesn't bonk and complain about excessive USB current draw when the device is plugged in since the VCC is indicating ground. I have one of the little usb voltage current pass through OLED meters. I will plug it into that and see what is indicated when I am home from work. (I'm hiding from work in my office trying to troubleshoot this) I hope I'm not being annoying with my messages here but I'm just looking for some advice or ideas as to what might be wrong. Thanks, Casey
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