sic wrote:Hi, I'm having the same trouble as OP. The 12 V supply I found and first tested has 1200 mA output. Could have that possibly hurt my device. I also couldn't see anything after connecting the power supply as there is no LED indicators. Would connecting my Pi do any help? Thanks.
First, my apologies for not responding sooner, I forgot to subscribe to this topic. I do not believe you have damaged the device, I accidentally reversed the polarity the first time I connected a power supply to my LCD. It simply wouldn't turn on at all. The power supply I have is an RCA "universal" that can go as high as 2500mA. I have noticed the device has a power save feature that will turn off the LCD if it does not detect an input signal from any of the 3 inputs. While handy, can be a bit of a pain if your not expecting it.
My recommendations are:
Check the polarity of your power supply.
Check all connectors and make sure cables are snug / locked in place
Test the display using the VGA port and another computer.