SO you say its not the fault of potentiometer ???
fukk but for 30 sec it worked it looked REALLLY KOOOL : D
This is typical, I had this happening before. It is not the fault of the pot you snapped. VHold has nothing to do with this.
It worked for whatever period then something snapped and gave you that shit. Something broke inside hence the line of crap. All these monitors are WAY past their expiration date, the monitor warranty on these was good until some time in the early 200s, but any of these still working today are special. If the monitor was used regularly, it is only obvious that it stops working now.
Get a scandoubler to connect the Amiga to any monitor. Some guy is making an Amiga RGB to Component box too, you might want to get that if you have a modern TV at home.
The WinUAE emulator is still a great tool if you have an Amiga. I make all my configuration there and then I just provide the Amiga with the properly configured disk. It's much easier. When I can't access my Amiga I can use WinUAE to continue work. But I wouldn't prefer it to an AMiga, specially if I already have one at home and with them being so easy to source.