Defender screen gone crazy

[Lenty]

Hi
my defender screen is suddenly doing this when I’ve turned it on. Any advice on a fix pls?

thankyou
Mark

 

[TheDaddy]

Looks like a sync issue , I aint good with monitors but assume there is a vertical / Horizontal pot for the monitor ?

Again i could be wrong as not my bag,

Dave.

 

[big10p]

Yeah, just looks like the h-sync pot needs adjusting slightly.

 

[Lenty]

Thank you for help advice. h synch pot was dusty. Cleaned and now working.

 

[TheDaddy]

Super news !