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unixronin: Galen the technomage, from Babylon 5: Crusade (Default)
Unixronin

December 2012

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Thursday, May 21st, 2009 01:46 am (UTC)
Someone local....
Thursday, May 21st, 2009 02:01 am (UTC)
Hmmm ..... Possible, depending on the value of "local". There's damned few consumer electronics repair shops left out there these days. I remember when I tried to find a place to get my first Pioneer DVD player repaired ... couldn't find a place willing to look at it for what it would have cost me to just buy a new one. Consumer electronics these days are so highly integrated repair is seldom cost-effective. But sometimes it's exactly the small towns like Laconia, with no big electronics stores in the area, where the odd repair shop is still hanging on.

At this point I've more or less written off the monitor anyway. I'd sooner put the money towards replacing another of our CRTs with an LCD, especially if I can only expect to get another year out of it. Still, I appreciate the tip.
Thursday, May 21st, 2009 03:18 am (UTC)
The rejuvinator isn't really worth it. It's a crap shoot.

The free fix is try the shorting trick. But film it because if it goes it goes very well.

Prior to doing that I can write up an examination guide that might help. Let me know.
Thursday, May 21st, 2009 12:05 pm (UTC)
But film it because if it goes it goes very well.
As in "Y'all hold mah beer and watch this now"? ;)

What does shorting the power transistors actually do in this case? I always thought it was usually considered a Bad Idea.
Thursday, May 21st, 2009 09:54 pm (UTC)
You're bridging the cathode to ground. Beam current will go to the maximum the tube is capable of. This will try to produce soft X rays but a pick off from the HV transformer will monitor current and shut it down. There are several other redundant safeties.

But...
If you see something like this I'd probably have to have a schematic to figure out how to do it right.
http://www.national.com/opf/LM/LM2453.html