I can't identify the type of scanners in your projector, but I did find several images that link to listings of Emma Laser projectors... They all show a single scanner amp board that is identical to yours. Assuming that these are the same units, Ali-Express is claiming 45Kpps speeds for them. I highly doubt that they are actually capable of that, but when you get the new units installed it would be a good idea to do some controlled testing to see just what they *are* capable of.
The large red board with the 4 white connectors on the top and the two groups of blue trim pots is the scanner amp board. It's very unlikely that anything was damaged on this board. Nonetheless, they may send you a new board along with the new scanners. (More likely that they just send the scanners though.)
If they send you a new board with the scanners, be sure to swap it out at the same time as you replace the scanners. The reason is that your original board will have been tuned at the factory to match your existing set of scanners. The replacement scanners may not have exactly the same characteristics, so if you have a new board to go with the new scanners, you'll want to install that new board as well since it should have been tuned to match the new scanners.
Once you're done swapping parts, load up the ILDA test pattern at 8 degrees and see how it looks at 10K speed. Then slowly increase the speed while watching the pattern. (Make sure you leave the size setting at whatever number gives you an 8 degree scan angle.) See if you can get up to 30K speed while still keeping the center circle just touching the edges of the middle square. If the circle starts to pull away from the square, or if it starts to distort into an elliptical or spiral shape, then you are scanning too fast. Back the speed down until the test pattern looks normal.
Once you have a maximum speed figured out (either 30K or some speed less than that), leave the speed at that max setting and now try increasing the size control to make your scan angle bigger. Again, keep your eye on the test pattern and pay close attention to the center circle. If it starts to pull away from the sides of the square, or if it starts to distort into an ellipse or a spiral, STOP. Back off on the size until it looks right. Now you have a size and speed limit for complex images. You *can* go wider than this for simple images or beam cues, but you must pay attention to the pattern and listen to the scanners... If the pattern starts to look bad or the scanners start to whine or squeal, STOP! If you continue scanning like that you will damage your scanners.
When you are done, please post your results. If the specs on Ali-Express are true, you *should* be able to easily hit the 30K speed mark, and even at 30K you should be able to pump the size up to around a 12 degree scan angle before you start seeing distortion on the ILDA test pattern. Maybe a tad wider than that even.
However, given that most of the stuff on Ali-Express is over-rated, I would not be surprised if you hit the speed limit at 25K or less when scanning at 8 degrees, and in that case to go wider than 8 degrees on the test pattern you'll need to drop down to 20K or even 15K speeds. But like I said, I'm curious to see what your results are.
Adam