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Dell P1110 in a dumpster.

post #1 of 18
Thread Starter 
I just pulled a Dell P1110 out of a dumpster. It seems to be suffering from something I've seen in the past where the picture is green with neon green return lines in it.

In the past I've just tossed out smaller CRT's but i want to try and fix this gem.

Ill be pulling the Color control board out as soon as i feel its safe, I just had the monitor on to see whats up with it and I don't feel like being thrown across the room and losing use of my arm for a day or so.

Any input would be awesome! I'm not too great on CRT inner workings here.
post #2 of 18
Just to be perfectly safe I would let the monitor unplugged several days to let the condensators completely discharge themselves, and hitting the power button a few times to help. If you want to be completely safe wear thick rubber gloves and stand on a rubber mat, I'm not too familiar with the risk associated with CRTs either, but I know that there's enough voltage and amperage in Tv's condensators to potentially kill you, and even if it doesn't, trust me receiving high voltage in your arm can be extremely painful
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post #3 of 18
a crt thrown in a dumpster and the tube wasn't broke? miracle ...


that aside, yes keeping your arm would be helpful to you in the future and wearing thick rubber stuff as telimektar suggested is probably the best way forward
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post #4 of 18
Thread Starter 
I managed to get all the boards out without any issues. Ive been going over the resistors a little bit, but after i found a bunch more ive been testing the working ones first.
post #5 of 18
A green tint on an old CRT almost always means that the phosphors have worn out. Each color phosphor degrades at a different rate, and the red and blue phosphors degrade much faster than the green ones. But if it's very green (as in, the red and blue components are either completely missing or close to it) then there's probably a fault somewhere along the signal paths, between the VGA plug and the gun.

The retrace lines are almost definitely a result of a failure in the blanking circuit. If they aren't that bright you might be able to get away with "masking" them by lowering the G2 voltage (normally located on the flyback). If there's ghosting and/or streaking along with the retrace lines, then you should check the FETs in the green video amp circuit.
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post #6 of 18
My old Gateway VX700 had a slight Green Tint. I would use nVidia's Digital Vibrance to lower the Green saturation a slight bit (like 5% or 10%?) and it sorted it out.
post #7 of 18
Quote:
Originally Posted by Manyak View Post
A green tint on an old CRT almost always means that the phosphors have worn out. Each color phosphor degrades at a different rate, and the red and blue phosphors degrade much faster than the green ones. But if it's very green (as in, the red and blue components are either completely missing or close to it) then there's probably a fault somewhere along the signal paths, between the VGA plug and the gun.

The retrace lines are almost definitely a result of a failure in the blanking circuit. If they aren't that bright you might be able to get away with "masking" them by lowering the G2 voltage (normally located on the flyback). If there's ghosting and/or streaking along with the retrace lines, then you should check the FETs in the green video amp circuit.
lets not forgot he found it in a dumpster..........
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post #8 of 18
Thread Starter 
What im experiencing seems to be decent blue and red levels, but Green is INSANELY prevalent in the picture, and you can see the return scanlines in neon green, i read this is possibly an issue in color control. I havent found anything wrong with the board yet though.

I might open a different P1110 and start swapping boards. I have a few with other issues, and i do have one with a blue tint too.
post #9 of 18
Thread Starter 
Quote:
Originally Posted by Manyak View Post
A green tint on an old CRT almost always means that the phosphors have worn out. Each color phosphor degrades at a different rate, and the red and blue phosphors degrade much faster than the green ones. But if it's very green (as in, the red and blue components are either completely missing or close to it) then there's probably a fault somewhere along the signal paths, between the VGA plug and the gun.

The retrace lines are almost definitely a result of a failure in the blanking circuit. If they aren't that bright you might be able to get away with "masking" them by lowering the G2 voltage (normally located on the flyback). If there's ghosting and/or streaking along with the retrace lines, then you should check the FETs in the green video amp circuit.
I havent even been able to identify the different color circuits.

Quote:
Originally Posted by Princess Garnet View Post
My old Gateway VX700 had a slight Green Tint. I would use nVidia's Digital Vibrance to lower the Green saturation a slight bit (like 5% or 10%?) and it sorted it out.
way beyond correctable by the source.
post #10 of 18
Quote:
Originally Posted by Xinoxide View Post
What im experiencing seems to be decent blue and red levels, but Green is INSANELY prevalent in the picture, and you can see the return scanlines in neon green, i read this is possibly an issue in color control. I havent found anything wrong with the board yet though.

I might open a different P1110 and start swapping boards. I have a few with other issues, and i do have one with a blue tint too.
Ok when you word it like this I'm almost certain that it's a fault in the green video amplifier circuit, and more specifically, the FET. It sounds like it's over-amplifying the green signal.
Edited by Manyak - 8/20/11 at 9:39pm
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