Hi, I'm trying to repair a wpc89 dot matrix controller of a Party Zone.

I replaced all the components of the hv section. The problem is that the output voltages seem correct, but dmd display remain black/off.

I have the 65V, 12.7V, 4.95V, -119V, -107V. The negative tension change of 2/3V after some time, but always with 12V difference.

1) The traces are all ok with multimeter/buzzer check
2) With a pin2dmd display, the graphics are ok (Then the problem moves to the hv section)
3) With another dmd controller, dmd display is show (so the display is ok)

Any ideas? Ty

I have pin2dmd, a lot of controller dmd, so I don't need the easiest way, but I want to understand why although everything seems ok, it doesn't work. Tomorrow I exchange the components one by one, I want to understand where the problem lies. Maybe some thin track that does not let current through? But I shouldn't have the right voltage with the dmd connected

Now it works!

IMG_20211201_181547 (resized).jpg