EBY-701 Native Auto-Switch Modification/Enable
I've seen a few threads of people wondering how to get auto-switch working on the new EBY-701 screens, including some with rather creative solutions like using a relay to toggle the AV/Source button.
Thanks to Dgr8wun who found a Russian website with a real solution, I was able to implement the modification. And due to a real lack of documentation (in English at least!)... here's how to do it!
Apparently the EBY-701 shares the same board as the new 629GL monitors which seem to have auto-switching out of the box. The difference? Three components which are conveniently missing from the EBY-701. So, let's put them back in!
You'll need (incl. Digikey P/Ns):
Two 10KOhm 0603 surface mount resistors (Digikey# P10.0KHCT-ND)
One NPN Bipolar transistor (Digikey# BC847BMTFCT-ND)
Some stranded wire (I used 18awg.)
Starting off, here is a picture of the board and the area of interest. Note: This was taken after I completed the work.
Here is a zoomed-in shot of the components you need to add:
The switch wire is soldered to a plated through hole on the board, just above the top-most added resistor.
Each of these components have a white square next to their board labels meaning Do-Not-Install. Clearly it was intentional to leave these components off this version of the board.
Another note: By populating these three components, you will be enabling video auto-switch for Video2. If for some reason you'd like to enable Video1 instead, you can populate a similar grouping of missing components that is to the right of the Realtek chip. I haven't verified this myself, but that's what the Russian forum said was true.
If you want to attempt this, be sure that you have a sharp or hooked soldering iron tip because these solder joints are in a pretty tight space and the components themselves are very small. Also, this should be obvious... but remove the board completely from the monitor and use proper ESD protection before working. Don't forget that you run the risk of toasting the board if you apply too much heat or zap it!
This worked like a charm, and I didn't need to alter any of the factory menu items for this feature to take effect. Apply +12V to the sense wire and the screen will switch to Video2, until the +12V is removed and it will switch back to your previous source. Connect the sense wire to your reverse lights and you're in business.
Good luck :)