I had similar issue, it was the infamous "flyback transformer".

Maybe sometimes, you just have to realize that old hardware breaks down.

I used a flatscreen tv/monitor with scart input, the picture was perfect, takes up less space and uses less power.

What's that? Is it possible to repair it?
I remember my dad was using it as TV when I was child, that's why it died soon x)
I know someone here that sell A520 for $40, don't know if it's worth or not.

well its a common cause of failure. There is this excellent site:

 http://www.jammarcade.net/commodore-1084s-p1-repair-part-ii/

but dont try it, high voltage, leave it to professional, blabla.
Is there a high pitched noise?
The hardest part is finding replacement. Original is quite pricey. I found cheap Chinese copy, locally, think it was less than 10eur.

Generally saying YES, but old scartcables don't usually have all the needed wires.

http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_SCART/amiga_scart.html

Most of LDC-TVs also works as a flicker fixer, so you will get flicker free hires interlaced mode as bonus.

Or you can get yourself a nice Indivision and use just about any modern monitor or TV in existence. :lol:

"Help the poor boy" :hammer:

:lol:

You could try using a GBS-8220...  they go for around $20.00.   I used it briefly before I bought an indivision.

The flyback transformer is a high frequency transformer that produces the HV for the CRT anode as well as several other voltages. If a replacement part is available then changing it is fairly straightforward but you do have to be careful poking around in monitors. I've repaired CRT monitors for decades and could fix it if you happen to be local to me (Seattle area) but shipping both ways would be cost prohibitive. Whatever the case don't throw it out, CRTs are not manufactured anymore and the last tube rebuilder shut down a couple years ago. What's out there now is what we have and when they're gone they're gone.