If the power supply is connected straight to the ICs, you could have killed it. But I would think it would buck the 5V down to 3.3V. In which case it should be tolerant of 9V. IC20 looks like a switch mode control IC, but I don't see an associated inductor. Unless there is more stuff on the bottom of the board.

Back side

Ok it has two 3.3V LDO regulators that should tolerate 9V input. Unless something else is directly connected to the input. Does your adjustable adapter put out enough current? I have the Atlona version of this and it needs a 3A supply @ 5V.

mine is 2 amps..

So i'll try to find a adapter with higher amps

See what yours requires first. Also did you try resetting it? Download the manual and read it.

Even though 2A is a lot for that kind of equipment, and the manufacturers generally tends to overspec the PSUs, I'd also definitely try with another PSU before assuming you killed the upscaler by giving it 9VDC. Startech's website - click Technical Specifications - says 2.6A, and the symptoms you describe indicates overloaded/bad PSU.

USB chargers from the renowned phone brands usually are of high quality. If you got a charger matching the ratings, and the skills/soldering equipment, you could put together an USB to barrel jack adapter cable and try with one of those.

Fwiw my (CYP rebranded version of the first model of the) vga2hdmipro came with a 5V 2.6A wall wart, but I've also had it running off of a USB port (though I might just have been lucky with that and picked one that provided more current than others).

Might just be flux residue, but there's a lot of brown muck around one of the legs of the LED by IC55 / CLU01 near the VGA port. I'm not sure from the photo if the LED case looks slightly melted or not. 9V vs 5V to 3.3V through a linear regulator means about 3.4 times the power being burnt in the regulator (dropping 5.7V rather than 1.7V), could maybe cause heat problems depending on package/heatsink?

snufkin wrote on 2024-03-23, 15:56:

Might just be flux residue, but there's a lot of brown muck around one of the legs of the LED by IC55 / CLU01 near the VGA port. I'm not sure from the photo if the LED case looks slightly melted or not. 9V vs 5V to 3.3V through a linear regulator means about 3.4 times the power being burnt in the regulator (dropping 5.7V rather than 1.7V), could maybe cause heat problems depending on package/heatsink?

Not for a short period of time. And most LDOs have thermal protection auto shutdown built in.