Hi, I replaced the main board on my sony 55w802A with a 47w802A. The TV comes on and even flashed SONY across the screen once while trying to reset it t o factory setting. However, it usually comes up and does one white flash fo llowed by about 1/2 second intervals of green/amber. I think I need to repl ace its firmware. I have the firmware on a USB device and have put in in th e USB port. However, I can't seem to get further then this following instru ctions on how to update firmware. If tried unplug 1 min and plug back in an d hold up arrow and press power on. This does nothing. No text on screen. I have other replacement parts from a 47 inch model and am willing to replac e these too. But it really seems like all i need is a s/w update. I assume all the s/w is the firmware. I'm I correct?
Any advice welcome?