SI pt2 table Top screen issue.

[Lenty]

hi all
any ideas what this issue is pls? Turned on for a few games and screen showing whites lines.

Thankyou

 

[big10p]

The Screen pot on the flyback needs turning down, but if it's only just started doing this, there must be some underlying issue.

 

[Lenty]

Thankyou big 10p… was all fine, turned on then this presented to me. I do notice the power supply making some nice buzzing noises. PSU issue?
where is the screen pt on the fly back located and adjust to see what happens?

 

[big10p]

Thankyou big 10p… was all fine, turned on then this presented to me. I do notice the power supply making some nice buzzing noises. PSU issue?
where is the screen pt on the fly back located and adjust to see what happens?

Here's a pic I pinched off the internet. Just in case you don't already know, the flyback is on the monitor chassis (circuit board connected to the monitor). The flyback is the thingy that has a thick wire coming off it, going to the suction cup on the tube. Should be 2 adjustable potentiometers on it - one for screen voltage, one for focus. Might be worth checking your voltages, if you know how. Possibly a developing fault on your chassis (pre brightness circuit, maybe - just guessing).

 

[Lenty]

Thankyou very kind and quick reply. Nothing to do with my PSU as that is making some strange buzzing noises that I've never heard before. Sorry if issue is not linked.

 

[Lurch666]

Just in case you don't know be aware there are very high voltages around the tube and the flyback so be careful.

 

[gunblade]

what model monitor is it? a toei?

 

[Lenty]

Just in case you don't know be aware there are very high voltages around the tube and the flyback so be careful.

Thankyou for the advise. I am aware of this but again good of you to help keep me alive.

 

[Lenty]

what model monitor is it? a toei?

Hitachi is the monitor make. PSU is making some strange buzzing noises?

 

[big10p]

Hitachi is the monitor make. PSU is making some strange buzzing noises?

Hitachi is most likely just the make of the tube. It's the chassis gunblade needs to know the make/model of. Post a few pics of the chassis and PSU so we know what you have.

 

[Lenty]

Sorry, Let me remove the board and share some pics. This is the PSU I have installed.

Thankyou

 

[Lenty]

Let me also check the voltages of my PSU. Could this issue be PUS related pls?

Thankyou

 

[gunblade]

doubtful, you screen volts is too high - could be cap related

 

[Lenty]

OK, anyone you can recommend to fix this board for me pls? Prior to this issue the screen was a little wobblily TBH.
Again thankyou
Mark

 

[Georgian2]

Screen gets darker on side when the B+ is too low. There could be a potentiometer that lets you adjust the B+ but without an manual is quite hard.

 

[Lenty]

Update, I have now removed the monitor board. Also enclose picture of the issue that it is giving. Any advice on this pls?
out of interest what is the video output wires from the enclosed connector marked ‘V’ pls?

Thankyou

 

[gunblade]

screen pot is on the neck card
caps look newish

 

[Lenty]

screen pot is on the neck card
caps look newish

Is this is pot circled in red that I will need to adjust to solve this issue pls?

Thankyou

 

[gunblade]

yes

 

[Lenty]

very kind let me try.