neo-tec nt3500 38" monitor wont turn on!!

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rocklite:
its from 1998. by the looks of it. ill try jamming it right in there again though. Yeah I've got a cable i made from two aligator clips and some speaker wire for this.

i dont know what xray protection is so ill look that up.

this was used heavily in an arcade downtown for over 5 years. I'll need to find a cap kit i suppose?

all the pots worked in the position they were in the last time i saw it up. i did not mark where they started out in the first place though... its going to be fun getting this going again. =[ ill mark them now regardless.

also a pot on the adjuster pcb is dead so ill need a new one of those too prolly. If you jiggled it, you would get either really bright or really dark and i just played with the flyback and contrast to compensate.

here are some pics.

"There's my model info."

"I've labeled the pots in case that helps."

"It's the Brightness pot that doesnt work. Figured I had found suitable settings messing around with my pots before."

Uploaded with ImageShack.us

MonMotha:
Did you adjust R111 (probably B+ adjust) or R429 (X-Ray)?

rocklite:
yes

lilshawn:
your x-ray circuit measures the B+... if it gets too high it will send a signal to the SMPS controller chip to shut down the power supply... Xrays are produced from the tube when the high voltage gets really high...it leaks out the backside of the tube and the neck where the glass is thinnest. the thick front glass has lead in it to help block out the xrays. the circuit is designed to shut down the monitor before the xrays get hazardous to your testicles.

maybe x-ray set too low....

or

B+ set too high.

either way, something isn't right.

high B+ can blow the HOT too so maybe you have multiple problems.

PS-

***DISCLAIMER***

I don't advocate the use of x-rays as birth control, and I discourage placing your testicles anywhere near monitors, especially when operating.

MonMotha:
The behavior of X-Ray circuits unfortunately varies with monitor. Some simply stop horizontal output (so nothing flyback derived, etc. but the monitor otherwise "runs"), some shut down the power supply, and some actually blow something up to force the monitor to shut down. I'd check for shorted components, attempt to put the B+ adjust in a reasonable position, and try to crank the monitor up again. You'll then need to know what to set B+ to as well as where to monitor it. A service manual would help (and would likely include full tune-up procedures), but is not required.

Sometimes getting these things back up after misadjustment like this involves temporarily defeating the X-Ray protection, usually by cranking the pot all the way to one extreme (which way it goes varies with monitor). You then get it running, adjust B+ and a few other secondary settings, then you attempt to re-set the X-ray protection.

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