(10-28-2021, 11:08 AM)admin Wrote: None of the ROMs should run hot at all. Are you using the OLED screen or LED strip?
Yep - that's what I assumed, which is why I'm puzzled by what I'm seeing...
Not using the OLED screen or an LED Strip (yet).
Quote:admin
Even without the VIC-II plugged in, you should see some change the video output when power is applied.
Oddly, there is no video output of any kind. Not even a screen flicker, or any kind of noise pattern, which is very strange.
Quote:admin
With the real dead test cartridge ($E000 version) you don't need any ROMs even plugged in. Try removing all of the ROMs.
Yep - tried this, but the effect is the same with the dead test - no video output at all.
Quote:admin
Have you verified that your PLA is ok?
I've tried a couple different PLAs, including the GAL and a 251913-01. Neither made a difference.
I tested both PLAs using the BackBit Chip Tester, where they "Passed" multiple rounds of testing.
Although, I don't have another working 407 board to test these PLAs with, so I can't confirm with 100% confidence that either are working.
Appreciate the responses...