My flyback burned and I replaced it, but now I am having a major problem with blooming! Whenever the picture is bright, it enlarges, and when it becomes dark, it shrinks alot. This is causing it to go way out of focus, and if I focus it when it is bright, it is out of focus when dark and bleeds alot and vice versa. How do i fix this? Is it possible?
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Re: Blooming causes bad focus!
This load-related change is caused by the failure of the power supply to keep the service voltage for the high voltage section regulated.
The flyback may not have been the only component that failed; its failure may have damaged components in the power supply itself.
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In the model listed here having contrast way too high can cause that--contrast should not exceed 70 percent and brightness should be a bit lower or equal--note as contrast is lowered the white smearing should lessen.
You have a problem called "blooming" which is caused by a defect in the regulation circuit of the high voltage section. If you are not a technician you probably cannot troubleshoot it succsssfully as this is a hard problem to solve. You probably can change out the entire high voltage board if you are good with tools and concientious. I looked on http://www.encompassparts.com and they list a service manual and quite a few parts, some are no longer available. If they have the board you should be able to change it with my tip at http://www.fixya.com/support/r4916851-diagnosing_repair_tv_high_voltage .
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if blue picture tube is blooming with retrace lines? it's because it developed internal short. you might try to turn down screen on blue picture tube. always mark with fingernail polish so you can return to starting position. J.D.W.
picture tubes do not "blow" go bad by going dark check your circuit board for fuses test them and, replace the bad ones as your high voltage circuit is what lights up your tv tube... tv tubes do go bad when they do they show "blooming" and, bad ion masking not a black screen unless the tv is a newer lcd / plasma screen then just replace the inverter board or, cold cathode
This can be a number for things. Believe it or not dust or cig smoke in LCD and pix tube projected TVs turns up looking a lot like focus error. Is the focus bad or do you have a convergence error (red, blue or green shading) Is there any smearing or blooming to the pix? The other comment for you is the TV is 9 years old I personally consider this very close to the life of the product. A simple good pix would tell volumns for someone like me (may need some resolution on the pix).
Hello although your on the right track about it being convergence , I am not sure at this stage the convergence circuit can be blamed .
televisions such as this ( CRT Tube ) do loose definition and focus after a time a prime visual sign of this is what we call blooming if you turn the brightness up and down rapidly the picture appears to go larger and smaller this is as the scan coils try to facilitate the change in anode voltage but due to age of CRT finds it it difficult to compensate .. it also accompanies blurring of picture and loss of definition at edges of screen .
you can try a Remote with the correct controls for the set and they will most probably be obtainable cheaply off the net on Amazon or Ebay and indeed from the adresses above this window . but I don't think realy this is going to solve your problem .
Engineers use a device called a tube booster
or Rejuvinator it clears carbon deposits off the electron guns in a tube that is partly responsible for this problem , sometimes it works and the equipment will go on for years sometimes the equipment is too far gone and it does little this may be your best solution other than a tube or TV replacement .. Regards Vortash
If the picture is only bending in on the sides the problem is in the pincushion circuit. If it is the entire picture there is a voltage regulation problem either in the power supply circuit or the power supply off the flyback transformer which is usually a diode and capacitor combination. If you want to go with the odds, replace CR4118 with part number 164590. You may want to put the original flyback in as there are many problems with aftermarkets and even if it is an RCA part it is still aftermatket. As far as the bias pots a little cleaning spray usually does the trick. I wouldn't worry about trying to get a perfect grey scale out of a 16 year old tube, the original pots are plenty accurate.