CRT Monitor loses Green
in [Repair]
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From: mike on 18 May 2010 22:04 jamesw(a)eatitall.com wrote: > My CRT monitor loses the green from time to time. Then the screen is > all pink in the background and I can only see red and blue. Just > about the time I'm going to toss it, the green comes back and it has > the excellent color it's had for years. I really hate to toss it out. > I know a fair amount about electronics and have done some tv repair. > This is a 15" computer monitor so it's basically a tv without a tuner. > Besides that, it seems that the only way to get a CRT monitor these > days is a used one on ebay or a garage sale. I really do not want a > LCD monitor, they're too hard to see if they are at a slight angle, > and because I edit graphics, the low priced LCD screens are just too > low in resolution and I can not afford a high end one. > > Any idea what might be causing this? The green may be gone for a few > hours or as much as 2 days. Then suddenly it pops right back. The > screen is not only ugly right now (no green at the moment), but hard > to see because it's brightness is reduced without the green. I'll > probably his some garage sales this weekend, but I'd still like to see > if i can fix this one. Appreciate any help. > > Thanks > > James > > > You should, as others have suggested, look for bad connections in the signal path. Put a scope on the CRT so you can look for signal when it goes out. If it turns out to be the CRT, and you've exhausted all other options, you might try hitting it with a stun gun. I've fixed shorted CRT elements that way. Be careful to get all the electronic stuff VERY FAR AWAY so you don't blow up good semiconductors in the process.
From: Winston on 9 Jun 2010 09:27
On 6/9/2010 5:41 AM, jamesw(a)eatitall.com wrote: (...) > It's not worth spending a lot of money or time on it, but I'll see if > I can bring it back to full color. Have you spritz'ed the video connector with contact cleaner? If you can locate a loose connector to mate with the monitor cable, you can run a continuity test. Merely 'buzzing' the 'green' pin to the inside of the monitor won't necessarily tell you the complete story. --Winston |