New Kortek Monitors Bleeding! WTF?!?

pacray

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New, out-of-the-box Kortek monitors are bleeding! (see pictures) It seems that white dots that appear anywhere on the top half of the screen, cause lines on the bottom half. Once I eat the dots, the lines are gone.

I have tried adjusting brightness and contrast, both on the remote and on the flyback.

YouTube video:

http://www.youtube.com/watch?v=sOZ7YaOGBPk

This is the 5th monitor from a batch I bought that are doing this.

Any ideas?
 

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Yes, but not all the monitors on the pallet were afflicted. And trying to get resolution from the fine folks at Betson is turning out to be difficult. I am hoping someone can pinpoint the issue so I can fix them myself.
 
Yes, but not all the monitors on the pallet were afflicted. And trying to get resolution from the fine folks at Betson is turning out to be difficult. I am hoping someone can pinpoint the issue so I can fix them myself.

You bought a pallet of these? How many in this batch? Hopefully you used a credit card. Tell Betson they can either send you complete new monitors or you'll do a charge back. Tell them they can also pay shipping back. You're not talking about one - this is not a fluke. I'd be ravin pissed if It were me.
 
you sure you dont have a board issue with the ms pac????


id start by doing caps... mabye like wg these fine folks mabye used some old nos caps that are already dried out...
 
you sure you dont have a board issue with the ms pac????


.

true, there is a Ms. pac board issue that looks like bleeding red.


But assuming it's the monitors, I'd check over the contrast circuit or red drive circuit if you have a schematic...
 
I am running the monitor off a 60-in-1, and every monitor seems to be doing it, so it's not the board.

I adjusted the contrast and brightness, and although it improves a bit, it still doesn't fix it.

I am inclined to agree that I got a bad batch, and as someone suggested, they got bumped around a bit.

They might work great with other boards, but they certainly don't like the xx-in-1's.
 
I am running the monitor off a 60-in-1, and every monitor seems to be doing it, so it's not the board.

I don't follow that logic....
In my experience (which is limited, as I've only used one in a cocktail table I put together at a friend's request), the standard video signals out of those x-in-1 boards is total crap... out of spec. Perhaps the VGA out is better... I never tried it.
So how do the monitors look with a real board?
 
I don't follow that logic....
In my experience (which is limited, as I've only used one in a cocktail table I put together at a friend's request), the standard video signals out of those x-in-1 boards is total crap... out of spec. Perhaps the VGA out is better... I never tried it.
So how do the monitors look with a real board?

Good question. I have a Crossbow, a Kangaroo and an original Ms Pac near by so I will check that out. Good suggestion.

I used to buy the VisionPro and WG monitors and they always worked great out of the box with the xx-in-1 boards. But these Korteks all have the same issue, regardless of what xx-in-1 board I use. The thing is, you really only notice it on Ms. Pac because of the white dots on a light colored background.
 
I talked to Betson today. They said they flew some people in from Japan (??) to diagnose the issue and will be sending out parts that need to be replaced on the monitors to make them work right. The lady I spoke with didn't know which parts they were, or what would be involved with the fix. I should get them via UPS in the next 2 or 3 days. I will report back.
 
I got the kits from Betson. Their fix was to change the cap at C613 from a 1.6KV, 332pF to 1.6KV 682pF. Then remove the diode at location D605 and replace it with a jumper. Then remove the cap at location C611. After that, they suggest adjusting the B+ from 125V to 128V +- 0.2V.

I tried this on 2 monitors and I still have lines. No change. Ahrg! Time for Betson to pony up and offer replacements or my money back.
 
yeah I just got a few of these monitors and the same problem, with mspac on the xx in 1 pcbs, I have torn apart every machine I have to test boards, psu's, harnesses etc and still the same problem
 
BTW, using the vga looks much better on these than using an arcade monitor in my opinion. Might be one of very few cases of this, but it was a huge difference to me.
 
kot

gotta luv kortek monitors, maybe try to get the problem resolved by kortek techs? although i had a batch of new ones yrs ago that as they heated up the monitor pic would shimmy back and forth, never got that fixed either, vowed to never buy kortek new again
 
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