Hi Guys!

Thank you for the great forum!

I've got a MX4000 (i've like 5, i will then post some pics of collection). and everyone of them works great This one i've got some issues. It was ok but then after few days started doing this.

I attach video

https://www.youtube.com/watch?v=U80LFyCUjMc

I thought was some ground problems but i did every solder and everything was ok Grounds, solders, capacitors (which i tried to change all of them).

I've tried to change the tuner, the back and left board (i thought was useless because audio tda, sync, tuner ecc was no problem i think) but eveyrything unchanged. I don't have oscilloscopium so i can't use it unfortunately.

What do you think could be? I've a backup chassis, exactly the same, where i can try some part to change (that chassis was a gift and had problems with tube exaushted so i decided to use as repair parts of the others) but i don't want to try to change everything....

Seems the oscilloscope, maybe the IC or TDA...seems can't sync the image with right oscillation.

Thanks!