5.5w 450nm blue laser very week

Hi.
I bought theelow laser to use in a cnc for engraving. it is supposed to be 5500mw and have a driver that came with it.

https://www.aliexpress.com/item/5500...795864565.html

it worked initially in burning but at full power was burning slightly and I did not know how strong should it be, till once, I was measuring the height by a metal ruler and got spark, then it stopped burning, and was very week.
I examined the driver board under the microscope, which showed white traces around the opamp. anyway I bought another driver and got an opamp and installed it, and now both drivers are working similarly. it burns wood very faintly, so i measured the current at the driver output and it reads 0.6A at 5v in both drivers, is this enough or the boards are faulty or the diode is faulty or what...thanks a lot