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aderusha / HASwitchPlate

LCD touchscreen for Home Automation
MIT License
727 stars 128 forks source link

Display works on USB but not thru PSU #120

Closed exeljb closed 3 years ago

exeljb commented 3 years ago

So I'm trying to get my setup working but I'm having issues while powered up thru AC power. Everything works fine when I power everything up thru the USB port on the D1 mini. Then when I plug in the AC (USB power removed) everything powers up, D1 and Nextion but the display doesn't seem to send any serial data nor does it react to it. I've checked that my PSU is outputting 4.99Vdc and has a ripple of 9mVac, USB power was showing 4.99 and 11mVac so I'm sure my PSU is ok. Does anyone have any insights on why serial data might stop working when not using the USB power?

xHirscHx commented 3 years ago

Had same issue look at my post in closed issues "no power issues" Check your grounds mine was a ground issue on the board.

aderusha commented 3 years ago

Nothing specific to offer other than a generic "check your solder joints". Have you made any more progress with this?

exeljb commented 3 years ago

I had a chance to mess with it this weekend. I had tried to clean up and make sure the solder joints were in good shape but the condition persisted. I opted to just grab another pcb and power supply and put it all together from scratch. The condition was not present on that new setup.
I'm unsure if it was a pcb, a psu or the transistor. A DMM measurement from display ground to psu ground showed 50 ohms, which seems high. On the new setup, I took the display ground straight to the psu ground. Anyhow, I'm all set now, project is working and looking good.