Bubble Bobble bootleg graphics issue

[insx]

Can anyone of you experts tell what this issue is likely to be from looking at the photos?

 

[Ace`]

Is video ground connected?

 

[insx]

Is video ground connected?

It seems not.

 

[insx]

Is video ground connected?

Solved, thank you very much. Is this because I have a SCART TV rather than a proper monitor?

 

[sukhbir]

over the years I have seen a lot of bootlegs where the video ground pad on the board edge is not tied down to ground.

 

[qjuk]

Solved, thank you very much. Is this because I have a SCART TV rather than a proper monitor?

No, you get the same effect on a normal monitor too.
There is a lot of boards that don’t have the video ground connected, probably because there are so many different types/brands of monitor. The easiest way is usually to put a wire link between GND and video ground on an adapter.

 

[insx]

The only issue I have now is that the volume goes from off to loud to extremely loud and sounds a bit scratchy.