Cracking/ticking sound when turning off NAC

[mchay]

I'm experiencing some ticking/cracking sound, when I turn of my NAC with MS8 and Toshiba tube.

With the monitor out of the cab I can't see any sparks or anything. Is this kind of sound normal enough for this kind of monitor?
I'm not experiencing the same with the MS9 in my other machine.

[grantspain]

probably the dag earth not connected to the neck card(single black wire to crt earth braid)

[mchay]

Just checked and there is a black wire going from the neckboard to around the flyback.

Just changed the chassis and neckboard and I experienced the same sounds with the old chassis/neckboard combination.

Any ideas?

[PrincessPrinPrin]

Is it a single crack noise or a crackling that fades away in a couple of seconds? Does it also happen when the picture changes from white (or very light) to completely black? Does it come from the yoke area?

[grantspain]

Just checked and there is a black wire going from the neckboard to around the flyback.

Just changed the chassis and neckboard and I experienced the same sounds with the old chassis/neckboard combination.

Any ideas?

there should be an earth wire going from neck card to the crt earth braid-its on a single pin connector(not soldered in)
the wire you noted is the screen volts

that crack you hear is the static

[mchay]

probably the dag earth not connected to the neck card(single black wire to crt earth braid)

Is this a pin on the neck card? I have some kind of brid running on the tube and ending in a black wire, but should this be attached to the neck card?

[yosai]

Yes. Attach the black wire to the pin in the white square, bottom centre in the image below.

[mchay]

This did indeed solve the problem.

Thanks