CRT bloom; any potential fix?
CRT bloom; any potential fix?
I have a SSM-20N1U which has bloom of about 5-10% from a white to black image. I know other people with the same model who have no bloom at all, so it clearly isn't caused by the monitor's design. I've read this can be caused by bad voltage regulation, but I'm a total CRT newbie; the most I've done is replace the caps on a Sanyo EZ20 back in 2012 or so. How would I check for this, and if it is the issue, solve it? Otherwise, what else could cause this and is it possible to solve?
Re: CRT bloom; any potential fix?
Could help ... there might be a potentiometer (aka pot, aka variable resistor) inside you might tweak - probably near the neckboard, but no guarantees one exists or where. Might find you can adjust the 'gain'/'drive' in service menu to compensate. Perhaps all three: cap replacement/manual voltage tweak/adjusting settings will do the best job.
Afraid you'd have to be super familiar with the particular monitor to confidently say one or the other is the fix you need; given age and if it's had reasonable usage I'd be erring towards all 3 particularly if this is a known aging issue with this model(?), but that might be OTT...
Presume you've read and are seeing effects such as:
https://www.reddit.com/r/crtgaming/comm ... htness_of/
Here's the service manual:
http://diagramas.diagramasde.com/otros/ ... 10-00e.pdf
Service menu appears to be enter+menu (p33 / 3-1). Handily enough seems to have default values should you mess up and need to start over. (General advice is to note current setting before changing service menus to avoid getting yourself in an undo-able hole of adjustments
).
I'd start with service menu. Then depending on confidence/visual inspection decide on next steps if service menu is of no/little help... The thing with pro monitors is they're typically chock full of capacitors for one thing or another, compared to the relatively simple schematics of arcade monitors, so it's typically a bit of chore to replace all ... but... it might be worth it to you ...
Good luck!
Afraid you'd have to be super familiar with the particular monitor to confidently say one or the other is the fix you need; given age and if it's had reasonable usage I'd be erring towards all 3 particularly if this is a known aging issue with this model(?), but that might be OTT...
Presume you've read and are seeing effects such as:
https://www.reddit.com/r/crtgaming/comm ... htness_of/
Here's the service manual:
http://diagramas.diagramasde.com/otros/ ... 10-00e.pdf
Service menu appears to be enter+menu (p33 / 3-1). Handily enough seems to have default values should you mess up and need to start over. (General advice is to note current setting before changing service menus to avoid getting yourself in an undo-able hole of adjustments
).I'd start with service menu. Then depending on confidence/visual inspection decide on next steps if service menu is of no/little help... The thing with pro monitors is they're typically chock full of capacitors for one thing or another, compared to the relatively simple schematics of arcade monitors, so it's typically a bit of chore to replace all ... but... it might be worth it to you ...
Good luck!