Negative, everything seems to be alright. Probably picture fault.

zami555 wrote on Yesterday, 13:13:

I have the impression that the pins in SIS chip, the one close to RAM, are bent. Please check carefully whether there is no short circuit between some of these, or that some pin has lost contact with pcb.

The attachment IMG_20251104_140623.jpg is no longer available

Will check that next days and let you know.

butjer1010 wrote on Yesterday, 08:05:

I also didn't saw this other oscillator 🙁
So, if You turn it on without SIMs, and with speaker connected, there is no sound at all?

So let's say the mobo works. What would happen if there were ordinary modules?

99% likely needs the 9-chip SIMMS. I think the keyboard controller is fine... The hex inverter is sometimes different (7404/7405/7406/7407), but the one you have looks like it's for the AMI controller, which is what you already have.
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It could actually be a RAM problem, on the 386DX-40 I have four RAM 30 PINs of 1 MB each, and they are all with 9 chips.