When I turn the TV on the sound is OK but it does not have video. There is a blank light on one side of the screen, but disappear inmediatelly. Until last week ago I used to fix it and have video just by turning it off, wait some seconds and turn it on again. Some times worked after two or three times turning off, sometimes I had to turn off and on around ten times. I allways had to wait around at least five seconds to have video when working. After the video was on, the TV was fine in general, but sometimes when watching TV the video went off, I tried again by turning it off and come back to normality. All the time and also now the red timer light blinks. In the last weeks the video went off more frequently until it never turn on.
I bought the TV aroung 6 years ago and I started to have the problem around 4 years ago. I took it twice to technicians when the video was off more frequently. In both cases they said that they did not find anything wrong, they cleaned, they moved the connections, and the TV started more stable for some weeks. One of them told that I had to change the Tube (??), but I understand the tube is still working , otherwise the video will never work.
What do I do? I review the TV and nothing inside looks burned.
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It definitely does not seem to be a problem with the Picture Tube. More like a cold solder. It is definitley not a job for a layman. Also, get a good technician to have a look, as locating cold solders is a labourous and time consuming process. It could also be possible that the main DC filter capacitor is getting dry, and may require replacement.
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Something is Wrong with the Video.Check Video out,Q705,732,761 and other components on the C board,c also check Q218,219,220 on the A board.In addition,unit could be in IK blanking,try turning up Screen Slightly
Most commonly, the power supply, and or scan failure causes this. There may be some bad caps, in these areas. In the horizontal output area, the flyback and the horizontal output transistor may also be defective. There may also be some damage to the power supply in this case.
I don't think it's your picture tube, but it may be a problem in your high voltage power supply. If there is no anode voltage then there is no raster (light from the screen) or picture. If it is your high voltage section the you may want to think about taking the set to a shop because of the danger of electrical shock.
donot quickly replaced the tube! try this first get 2 megohms 1/2w resistor solder it between blue gun and green gun.if this make the picture still, bad tube.u can still rejuvinate it.if not,bad capacitor in vertical or bad g2(screen) adjuster.