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I replaced most of the electronics in my OpenEVSE, including a new OpenEVSE v6.5 and Color LCD v3 + Temperature. (Still using my earlier WiFi board, no longer using separate temperature.) I also replaced my Struthers-Dunn relay with a new Packard relay.

The charger works fine and WiFi controls also work fine (changing the current limit, LED brightness, viewing status / temperature / time). However, the LCD display always shows gibberish characters. They seem to change at roughly the times I'd expect based on charger state changes, but they always are nonsense.

From other threads it sounds like some LCDs have different resistor values that make them more susceptible to noise, but my understanding is that's old versions. It also sounds like it's more likely the cause if the LCD shows correct info initially and then gets garbled. Might resistor values be a problem with this one?

Are the LCD v3 and OpenEVSE v6.5 compatible? Support said they were before I ordered but I'd like to double check.

Thanks for any advice! Not critical but it'd be nice to have info on the LCD as well as the web portal.

 That all looks a bit corroded... Have you got a good ground connection to the back plate?...

And note this for the cable Rx/Tx pins on the connection between the OpenEVSE module and the (new) TFT LCD:

OpenEVSE_PLUS_v6.5.1 <-- FTDI Serial --> OpenEVSE WiFi TFT LCD v1.0.1

Good luck!

> That all looks a bit corroded... Have you got a good ground connection to the back plate?...

 > remove the White wire from your harness between the WiFi and the controller

Thanks for the suggestion. I tried that, and it doesn't seem to make a difference.

While I was doing that I also unplugged and reconnected both ends of the cable between the LCD and the OpenEVSE, and that didn't seem to make a change either.

Incidentally (doubt it would be interacting with the LCD) I noticed that a bunch of the safety checks were disabled:

From what I can tell those may just default to off? I turned on ground monitoring, GFCI self test, and stuck contact detection. (Seems like vent required is N/A most of the time.) However now I see the "No ground" check's failure count increasing when I restart, so I wonder if there is a bad ground connection as suggested previously. Based on the safety feature and error no ground descriptions, I think I do have the right connections wired. I'll plan to use a multimeter to check my ground continuity for the OpenEVSE and LCD.

I checked/tightened all my ground connections, and verified I have <= 0.2 ohms from the house-side ground wire to all of: back plate, ground wire on the car-side cable, screws on the OpenEVSE, ground pin on the OpenEVSE's I2C jack for the display, ground pin on the OpenEVSE's jack for the WiFi, ground pin on the WiFi. Display still shows random characters.