I have a 21" Sharp TV that is 3-4 years old or maybe even more.
At random times throwout the day, the picture disappears and is replaced by a bright white horizontal line across the screen. If I turn the TV off for a count of 5 or so and turn it back on, the line disappears. Sometimes it comes back after a minute or so and sometimes it doesn't. I have not been able to determine whether this is due to circuit overloads or power surges or what.
Is this worth repairing or should I just trash it and get a new one?
I have A 26" sharp I don't know the model but the same thing happens to mine.
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I have an old Thomson TV 21FDR more than 10 years old. Recently the Tv screen has a lot of disturbances with the screen full of hirizontal lines and a hissing sound. A well trained technican had replaced the tuner with a new one . But after some 2-3 days the same problem is with the tv. Kindly help me with suggestions.
My thoughts is that after all these years one of the solder joints has cracked and there is enough current that builds up that it will jump accross the crack and work for a short time and then the componenet heats back up and 'well' off it goes. 15 years old. - you got some great use out of this TV. Maybe time to look to get a new one - These types of TV's were only designed to work for 10 year and then throw them away. Be aware that the new ones are only made to last 3 to 4 years. I know - I don't like it either. They cost a lot more than that Panasonic did when it was new. Blessings, A/V Media Guy
i think its time to get new one ,for 22 years it has served its useful life now its in the end life when it will start giving problem even if you fix this one another one may likely come up at times this is usually the case as most of the parts are worn out after many years of service even humans so i think your best bet should getting new one .
hope this helps
Try to remove the cover of your unit and clean the tube with a dry cloth. try to look for the anode cap. the one tht is connected to your tube if there are holes in it. This causes the problem.
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.