Sadly, board repair is rare to never. Change the big board, the one that the HDMI signals go to with a good board.
Yes this monitor is old. I bought it second hand with the idea I may be able to get it to work properly.
The first issue: When plugged in to HDMI of my laptop, the screen displays a message "Out of range signal
Cannot display this video mode,
change computer display input to 1920x 1200@60Hz"
Bare in mind i've tried plugging the monitor into my own laptop via HDMI and VGA, my friends desktop PC via DVI and to an Xbox 360 w/ HDMI.
Through all inputs if the "out of range" message disappears, the monitor displays "now entering power save mode" and puts itself on standby.
After hours of fiddling, I've found that if I plugged the HDMI cable from the monitor into my laptop, and plug and unplug it into my laptop over and over with about a 1 second gap between, the monitor will eventually get rid of the display message about "out of range" and show lines and lines of odd colours on the screen or sometimes just a single colour (like green) filling the entire display. When the monitor is like this it allows me to access the menu option using the monitor buttons.
One thing i took note of that in a setting on the monitor that displays information about the monitor it says the resolution is like to 4096x262. And at this moment it says it's set to 262x1200 (The native res is 1920x1200)
Sorry for the gigantic thread but I'm glued to trying to get this thing to work properly.