[Solved] Debugging BW Variant #8 Screen

[swm93]

I purchased a BW screen and ended up with BW variant #8. I moved the red cable according to the image on that page and hooked the screen up to a 5V power supply; however, the screen did not light up and does not appear to be working. I did a few minor tests to see if my new solder joints were good, but beyond that I'm not sure what else to try.

Here's a brief summary of what I have done.

1. Tested voltage between red circle (positive lead) and black circle (ground); found to be 5V.
2. Tested voltage between blue circle and black circle (ground); found to be 3.3V.

This indicates to me that the screen is being powered correctly and the problem lies elsewhere. Any suggestions for other tests I could perform are greatly appreciated!

NOTE: When testing I did not connect the yellow or white wires to anything. I assumed that the screen would light up even if these wires were disconnected. Is this an incorrect assumption?

[YaYa]

Did the screen work before the mod ? Did you test it to be sure it was working out of the box ?

[swm93]

No I didn't have any luck getting it to work before the mod either. When testing before the mod I also did not connect the yellow or white wire though. (Meant to put that in the original post... Thanks for bringing it up!)

Likely a faulty unit, but I'd like to spend a bit more time testing before ordering another one.

[YaYa]

You need an input to make the screen work. Just powering those screens won’t switch it on...

[swm93]

Yup that did it, thanks! Didn't think it would be necessary to connect the input to see it light up.

[YaYa]

Glad to hear that ! Put a [solved] into the topic’s title to help future people