So maybe a corrupt EEPROM? It's very repeatable. Never changes. If I could get to the service menu, I may be able to clear it.

I was given this TV with little info. Was told that it didn't have a picture. Upon powering it up it displayed the Vizio logo and the menu was able to be displayed. I connected an antenna (OTA), did a channel scan which completed and the picture has been fine for days. The only issue is it has an initial blink code of 23 upon power off, followed by a 19 about 75 seconds later which then repeats the 19 code four more times. I haven't been able to find the process for entering the service menu nor do I have the service manual for this model (I do have the E60-C3 and E70-C3 service manuals but they...