I bought from ebay a used ACA500+ and try it tomy a500+ It comes with a black screen and sometimes a strange red or blue garbled screen and system is halted. The digits are showing after5 seconds 0_ and the last underscore _ is blinking.... The switch button has no effect.
What can I do ? I think it has lost the firmware but it cant boot to reflash it. Is there any way to reprogram it from jtag or remove the chip put in a programer and reflash it or from elsewhere ? what else can I do?
The switch had a problem and I replace it. I dont have a receipt and no waranty only the ebay buy. the only serial I have is ACA500plus ]142[ TT04W
I can check whatever you told me with a multimeter or an osciloscope.