I’ve been working for weeks with two Cobra II systems with connected CP7 displays running off the USB port (using a USB cable with extra USB power connection) and everything has been working just fine. I’ve never had one problem with the touchscreen and clicking buttons, checkboxes, etc. Now I’m ready to perform some burn-in testing and removed the USB power and plugged in a 12V 2A power supply into the Cobra’s power jack. All of a sudden I’m getting all kinds of touch events that are completely off. I have a screen with a button on the right side of the screen and one on the left side and when I click the right side button the left side button actuates! A lot of the times the buttons take two or three times to click before they actuate, if they actuate. The touchscreen is completely wonky and is totally useless!
So, thinking that I’ve got a power supply problem I plugged in a completely different power supply, 15V 4A. This does not fix the problem. The touchscreen is still completely off, actuates the wrong buttons, you name it!
So, thinking that MAYBE it is the on-board power supply circuit being bad I tried another board and I get the same results.
So, thinking that it is a board problem with the two boards that I have I plugged in a USB Client DP into one of the spare sockets to power the system with the two different power supplies and I still have the same problems.
BUT, if I plug in the USB power through the micro USB port as I have had all along when developing the system the touchscreen works just fine!!!
I scrounged around and found a 5V 800ma power supply that I can plug a USB cable into and power the board through the USB port and it really doesn’t work any better. The touch events seem delayed and can still actuate a button on the other side of the screen. Don’t know if this is maybe related to the fact that it is only a 800ma supply, but I don’t have anything with more power.
WHAT THE HECK IS GOING ON??? :wall: :wall: :wall: :wall: :wall: :wall: :wall: