Question about Samsung HP-T4254 42 in. Plasma Television
Try leaving the TV unpugged for 30 minutes so the TV can reset itself.
If that doesn't work, most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.
I hope I shed some light on the subject for you.
Posted on Jun 29, 2009
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Posted on Jan 02, 2017
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Hello, there are three options for such failure, the first and simplest is to try to get the remote control out of the room while the TV is off when it is in stand bye. A second possibility is the micro switches in front of the TV, you can verify that they cause failure by disconnecting the cable that connects them to the main board. If the problem stops, you will need to replace all the front switches. And now the last option, however the more expensive one, that there is a malfunction of the micro-processor circuit, from which comes the command to turn on the TV. let me know if that was helpful! Please come back to me, if you have any questions or if you need further guidance
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