Friends, I need your help..  ( Beomaster 1900 )

After repairing the slider potentiometers the right channel doesn’t work anymore, and after checking what’s wrong strangely enough the right started working again and left is dead...

When the print isn’t mounted in place it works, so left and right are okay, but when I screw it in place the channels is gone.. so I also made sure I haven’t made a short somewhere..

First I thought, I must have broken the potentiometer, but after testing the compleet tuner print in my other 1900 unit I found that it’s not the print and repaired sliders, because in the other unit it works just fine..

Than I thought, it must be the wire harness that has a flaw, so I took the unit apart and checked every wire to check if one of them is cut, but every wire checked out.

At the moment I’m kind of lost on what to check next..

To be clear, all capacitors have been replaced ( except for one, the kit was one short ) and the problem only occurred after fixing the sliders ( that checked out okey ) 

What to do, what to do...