I tried to turn on my set with no luck. I unplugged the tv and it came on but only long enough to get sound and then turns off again. Unplugging the set allows me to repeat the problem but has not corrected it, any suggestions.
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Re: TV comes on then goes off.
The unit is sensing a problem and thats why it turns itself off,if you are familiar with tv service you can check the output transistor for a short ,this is a good place to start,this will involve checking the component with a meter if is bad it will have to be replaced with the same type,if the transistor is changed and it fails again the set might also need the output transformer(flyback)all this checking has to be done with set unplug,if you are not too familiar with tv's be safe and call for assistance from a servicer this is the high voltage area and is dangerous.
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Have you tried the user manual? There may be a setting in the menu indicating whether to use internal speakers or some other device run through say, a cable or HDMI output, or turn off sound for those using a cable input to the TV from say, a cable box, but the sound goes to a separate sound system.
Also check that there is sound coming INTO the unit from your cable box if you have one and use RCA cables. If using HDMI input, there may be a menu item as well, to control whether to use input or not, as some people will have the cable box send the sound to a sound system instead of the TV.
You need to contact a local TV repair service, UNLESS you have the tools and the repair manual to repair it yourself, it will take diagnostic work to determine what is the cause, one thing is for sure you have a defective circuit board.
Tries tv and cable or satalite boxes unplug,replug it back like about an hour later.Than tries goes into the tv Menu go into Audio Setting and do a resetting back to the factory setting.Follow these steps,should help ur tv sound to come back.
It sounds to me the Power Supply Board is bad. You will need to get the numbers off the original board by taking the back off the set ( After unplugging the set of course) and the you can contact a board company ( Encompass Parts Distribution ) or any other company that you might find on the internet with your google search engine and order the board. Good luck with this problem.
Ed " Original Radio Man"
a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.
Here's my suggestion , unhook all the external components to the TV
and leave the TV unplugged for more than a few minutes (a
day/overnight). The next day plug the TV into the wall outlet (not the
powerstrip) without anything hooked up to it, and turn it on. See if it
comes on. Sometimes unplugging for a few minutes/hours is not long
enough for it to reset itself.
It means that the TV set has a short in it somewhere. The sound you hear is the power supply trying to start up and shutting down. Most likely the Horizontal output transistor shorted because of a bd high voltge flyback transformer went bad. Common problem for these types of sets. Good Luck