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I can see which posts on the lower right are for the output speakers, and the small connector labeled 'L' & 'R', but what voltage is the VCC? I'm thinking it might be 12vdc.
That's good info. The cap says 35v so it's probably 12vdc for the supply.Possiblilities :
* Is it labelled for 8 ohm speakers? Anyway start testing with 8 since 4 ohm can draw extreme power.
* Isn't a volt rating marked on those electrolytic caps? A reasonable supply voltage is 1/2 of that volt rating.
* Touch a finger to the heatsink as you increase the volume gradually over a few minutes. Consider you're at maximum watts when it's too hot to keep your finger on.
THIS IS THE PART !!!This is definitely a class-D high power audio amp. Visually similar is this one. Based on TPA3116 chip. Definitive answer if you remove the heatsink and see what written on the IC.
For me it gives a lot of pictures from selling sites. And on these sites you find the specifications.An image search just shows printed ckt boards.