Ok, further but still very confused, I checked all connections that witchery said I should check between u20 and u1 on main board, none show continuity. Witchery also said I should check voltages on u20 which I will do next. I also checked all FBs and Ls in the areas of u20, u23. All had continuity. Not sure if continuity between u1 and u20 is good or bad? Witchery also mentioned u65 might be an issue as well as xtal. It didn't mention u23.

Board 2 ran and passed all memory checks, save one. u38. Witchery had me check a pin on that ram chip and it did have continuity with the corresponding pin on u1. Not sure what to try next. Board looks clean. I can't find any visible flaws with magnifying glass.

Just checked voltages on u20, ramdac chip. On main board. I am getting 5v on pins 9 and 61. No real voltage on pins 27, 41, 43, 50....
. hmm probably a bad u20?

quattro64 wrote on 2026-06-02, 22:32:

Just checked voltages on u20, ramdac chip. On main board. I am getting 5v on pins 9 and 61. No real voltage on pins 27, 41, 43, 50....

No voltage on 27, 41, 43 and 50 indicated interrupted power to the RAMDAC. There must be FB, L or low-value R nearby that is open and not conducting.

quattro64 wrote on 2026-06-02, 21:41:

Witchery also mentioned u65 might be an issue as well as xtal. It didn't mention u23.

As I said, Witchery doesn't know X-24 board, its chips and markings.

Ok, I will keep checking.

Ok, I was confused about u20 orientation and pinout, rechecked all connections between u1, u20 everything fine. rechecked all voltages to u2o pins, all fine. Looked at every FB, L ,C, and R on the main board. all measured as expected. How hard is it to find a ramdac chip for these cards? I think I could learn to use a hot air solder station.

thanks

quattro64 wrote on 2026-06-06, 14:14:

Ok, I was confused about u20 orientation and pinout, rechecked all connections between u1, u20 everything fine. rechecked all voltages to u2o pins, all fine. Looked at every FB, L ,C, and R on the main board. all measured as expected. How hard is it to find a ramdac chip for these cards? I think I could learn to use a hot air solder station.

Do you have an oscilloscope? Also, I'd like to see the log file.