Sounds like you're gonna need a PC or a laptop.
Like I said earlier, if this is the case with these, they are not monitors, they're digital displays. There are USB monitors, here's an example.Just FYI... these monitors are not traditional monitors as you would expect.
I pulled mine apart also, same board as the one you show. As you can see, the speakers are plugged into the board at the upper left side in your picture. I was hoping to find a jumper to turn them on but do not see one. However if you notice at the top edge around the middle right next to the jumper for the backlight voltage, it is marked "VOL SEL" and a space where a component would go. Perhaps there is an adjustable pot that goes there to adjust the volume. This would make sense as I could find no volume adjustment anywhere in the software. What do you think?Pulled my monitor apart tonight. As I figured, there's a proprietary motherboard inside with a USB and SD port but nothing else.
THere are some other available pins on the board but I need my magnifying glass to see them.
Also inside are 2 small speakers, a sound amp and a powersupply (both on the same board)
The motherboard outputs direct to the monitor/lcd driver with what looks to be LDVS connector.
board number = 3Q-M113-V4-140312
If you can read chinese...
The LCD is a LG display panel.. I'll post the model number later
You 'might' be able to order a HDMI to LDVS converter to use the lcd panel as just a monitor but don't quote me yet.
more to come.