Do you have something like a Kill-A-Watt meter? If the power usage is suspiciously low, it could be the flyback transformer itself. That it plays sound is otherwise a good sign, though. I'd take a peek inside to see if there are any obviously-blown caps and stuff like that (of course, it shouldn't HAVE to be said to be careful on the inside of a CRT monitor/TV, but it's a worse idea to not warn people of the shock hazard).

AlaricD wrote on 2024-03-12, 20:22:

Do you have something like a Kill-A-Watt meter? If the power usage is suspiciously low, it could be the flyback transformer itself. That it plays sound is otherwise a good sign, though. I'd take a peek inside to see if there are any obviously-blown caps and stuff like that (of course, it shouldn't HAVE to be said to be careful on the inside of a CRT monitor/TV, but it's a worse idea to not warn people of the shock hazard).

Thanks for your warnings. I don't have Kill-A-Watt, but I have a multimeter and can use it. As far as I understand there is low voltage but not high voltage. Do I need to look for paths to flayback for this?

Might be the connector where you plug in the video cable or the fly back could be dead, or there could be any number of other problems. Impossible to say.

Also CRTs have voltage in the 20,000 volt range.

The solder joints at the flyback transformer are also notoriously bad. Visible cracks are not uncommon even in 1084 monitors that still work.

The digital to analog switch was going bad on mine, kept meaning to change it or clean it, but then had to leave it behind in a long distance move.

Bear in mind you've got maybe 3x3 input and setting combos and be sure you are on something sensible, and nothing stupid is going on like the contrast and brightness potentiometers are set way down or are also glitchy (observe screen when cranking them back and forward)

Your post was too "narrow".... You didn't wrote did You try on all inputs, you didn't mention if You tried all the switches on the back side of monitor, or like BitWrangler said, did You tried all the potentiometers,..... Maybe all this would be helpfull....

Whatever you do, don't touch the flyback, even when the monitor is turned off. First, discharge the high voltage, then check for broken solder joints.

https://www.youtube.com/watch?v=0X28FX_XxtU&p … HRoZSBmbHliYWNr

butjer1010 wrote on 2024-03-13, 21:25:

Your post was too "narrow".... You didn't wrote did You try on all inputs, you didn't mention if You tried all the switches on the back side of monitor, or like BitWrangler said, did You tried all the potentiometers,..... Maybe all this would be helpfull....

I connected a camera to the rbg output. The sound comes out perfectly from the monitor's speaker. But there is no image. As far as I understand, there is low voltage. There is no high voltage. That's why I opened the monitor's case. I drained the tube. I'm currently making measurements on the motherboard.

There is high voltage in crts, it is dangerous.

kenan8332 wrote on 2024-03-17, 18:49:

butjer1010 wrote on 2024-03-13, 21:25:

Your post was too "narrow".... You didn't wrote did You try on all inputs, you didn't mention if You tried all the switches on the back side of monitor, or like BitWrangler said, did You tried all the potentiometers,..... Maybe all this would be helpfull....

I connected a camera to the rbg output. The sound comes out perfectly from the monitor's speaker. But there is no image. As far as I understand, there is low voltage. There is no high voltage. That's why I opened the monitor's case. I drained the tube. I'm currently making measurements on the motherboard.

Did You try this switch (picture - Yellow circuit)? This is the switch for changing to RGB or CVBS (if i remember right).

And also try switch camera Video output (yellow jack) to other "holes" 😀 There is chroma and luma, but the rgb works only in one of them, and i believe in luma. Switch right to the scart (same as the one i marked yellow on that picture up there) is i think for monochrome or something like that, but i think the picture will be there no matter of position.