CRT monitor display problem

[polashd]

CRT old monitor ( Samsung) of my pc does not display any picture but only some color lines like the image I've attached.
The problem started few days ago for the first time in its life.
At the beginning the problem used to stay for few seconds and come back to normal display on its own or with a knock of my hand.
Gradually the problem increases and now it rarely become normal.
I opened the case, cleaned inside with air & brush. Then re-soldered all the component joints of the small circuit attached with the picture tube.
But nothing happened, the display is still like that.
What is the problem? What should I do now?
please suggest

 

[basroil]

No pictures attached.

Not being able to see the images though, I would guess the magnets are starting to see their end.

It's time for you to start looking into replacing it with something better.

 

[Solandri]

Agreed with basroil. I'll also add that:

I opened the case, cleaned inside with air & brush. Then re-soldered all the component joints of the small circuit attached with the picture tube.

It's highly inadvisable to do this. The old CRTs and picture tube TVs used big capacitors which could hold onto their charge for several minutes to several hours after you've unplugged the monitor or TV. It's generally not enough to kill you, but you could give yourself quite a shock if you touched them wrong. Very high on the list of things you don't want to experience in life (a friend of mine did it to himself, and the experience was so unpleasant he immediately tried to trick me into doing it the next day). The same was true of the power inverters on the CCFL backlights of early LCD monitors, though they held considerably less charge (their main job was to increase the voltage to several hundred volts to drive the CCFL).