If you have already adjusted the focus pot on the line o/p transformer (a small transformer with a lead that has a plastic cap attached , and is typically clamped onto the top of the crt/tube BE CAREFUL DONT TOUCH CAP WHEN TV ON VERY HIGH VOLTAGES)
also could be your crt/tube is bad if so then scrap/recycle
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This symptom indicated of faulty CRT socket (picture tube socket). A few days or weeks time the symptom will remain and will not back to clear picture. Below is the sample picture of the socket where is connected to the picture tube.
You may replace it yourself if you have a little knowledge in soldering and disoldering technique. There are two wire soldered in this socket from the flyback, one is the screen and the other is the focus.
Try to buy from your local electronics supply, bring the actual sample because many types are available at the market.
Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
no rocket science here - my son fiddled with the cable cord attachment, until presto, the screen became sharp. Then we moved away as fast as possible, lest we shifted it and it put us back at square one.!!
Focus and Screen. The focus control may help, just like focusing a set of binoculars or an old camera. Watch the picture on the TV, using a mirror can help and make an adjustment until the picture is as clear as you can get it. If it still is not clear it may mean that your picture tube is weak. If you can avoid it, don't touch the Screen control. If you have, let me know and I can advise you on the proper way to adjust it.
First, Have your tv 's circuitry be resoldered. this might be a case of loose contacts particularly along the crt circuitry. the longer you operate the unit at this condition, the faster you are counting the possibility of shortening the lifespan of your tube. 9 years is quite a young age for a unit which has an average of 18years.
If the picture is fuzzy (out of focus) it may have a focus adjustment
on the flyback transformer. Possibly an adjustment available from the
outside, through the back. Look for any markings on the plastic housing
indicating Focus, Brightness etc.. You can use a small screwdriver
through the labeled holes in the case to make adjustments.
If the picture is crisp, but faint or the colors seem washed out it may
be the tube is at it's end of life or needs to be rejuvenated. TV shops
can rejuvenate tubes but it's not cheap.
At the rear of the tv there may be two controls on the right hand side marked "screen" and "focus".If the set is newer,you will have to remove the cover and look to your right.You will see a dark object with a black or red wire coming out of it's top.That is your flyback transformer.On this you will find these two controls.Adjust your focus with the one so marked.Be careful to only adjust this control while you watch your picture clear.PROMPLY put the cover back.
it is due to poor focusing
1 set with focus control fitted on flyback transformer,
2 check focus control wire comes to crt base is loose or some foreign material deposited on it.
3 crt base loose contact.
4 if tv is old then there is a possibility of crt is getting weak.
if you are not a technical person do not open set as tv has very high voltage inside.
hope this will help.
blurry picture is mainly due to focusing voltage is not proper.
1 check & adjust focus control on flyback.
2 check crt base for loose.
3 wire going to focus control on crt base got disconnected due to foreign materials deposit on it.
4 if tv is old possibility of crt getting weak.
Ok with you I can skip the "do you have electronics experience?" questions. With 14 years under your belt you are a pro. So here we go.
The problem you are experiencing is called blooming/loss of focus this occurs when there is an increase in CRT anode voltage and control of the electron guns (in the CRT) is lost. The result is the picture spreads and focus is affected. The problem can some times be taken care of by adjusting the focus control However if you have auto focus the auto focus circuitry might be the problem.
The common parts (areas) to check are as follows:
1) Focus control (to see if the problem can be soled by adjustment)
2) IHVT anode (test to see if voltage is correct you will need a schematic and a high voltage probe)
3) CRT Socket board ( Check to see if the bias voltages and input signals are correct you will need a schematic, multimeter and oscilloscope)
These would be the areas to check, I hope that you are seeing my point here. My next bit advise if not one of your experience, you have that, 14 years of it. However, you have little ones and they are your NUMBER ONE concern, So my advice would be to get the set repaired at a TV repair shop. The reason being is because even though I have named some places to start your troubleshooting, TV repair is not an easy thing and there may be other components that could have gone bad and you don't have the time to do investigative troubleshooting.
I wish you well on this issue and take care of those little ones.