FINALLY got my problem 800xl board running... EXCEPT it only works with the BASIC IC chip out. Tried two spare ones and both result in a black screen. Take it out and self test loads. Tried with holding option too. This board has been nearly a year off and on to get working so any ideas to finish would be wonderful! Thank you!
Process: checked all chips and put in good ones if needed. Even installed a new power switch and SORTED THE COLOR with the NTSC color adjustment knob on the board. WHOOOHOO!