Welcome to the club. That topic brings back memories of disecting the slbs pwm section. I am still recovering.
Are you having same machine as dv? Did you replace r9 r10 ic3 and all that? There’s a lot happening within that topic. Could you maybe zoom in on what problem you have on what machine and if you indeed are having contact with sienci aboit it.
The solution to dvs problem is presented in the first post and refers to this post.