We have had a Samsung HDTV for a couple of years, and up till now it has worked great. The picture began showing curvature, then started going out, reappearing, going out, etc very rapidly whenever the set was turned on. When the picture would fade out, the audio would get very loud and distorted at the same time. During the days leading up to this event, we would hear loud "popping" noises coming from the set periodically throughout each day.
A cable repair tech was here delivering a new HD box, and when hooking up the new cable box, he got shocked mildly. He hooked up some instruments and told us the television set was "pumping out excessive voltage", way beyond normal limits. He said that instead of using the electrical house ground, it was using the cable tv coax to ground.
What would cause a television set to "output excess voltage"? What might the fix be, and what kind of costs are we looking at?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
the first thing you can do is to unplug the tv unit not to used for an hour to discharge excessive voltage at the power supply board to reset the dc supply at the main board. then after an hour try to plug and turn it on. if still doesn't work at this time you will need to make a voltage checking if you know a basic electronics trouble shooting or you want a DIY just follow some of my steps by steps repair instructions.first you must need to check the output dc voltage at the power supply section, if their is an output which supply the whole circuit just be careful since you are dealing with some high voltage. the supply at the indicator light at the front is just only the stand by voltage. you will need to check the B+ voltage which around 110vdc at the horizontal section which turn on the whole circuit. you can used a digital tester to make a voltage checking just set to dc voltage. if their is no presence of 110v dc at the horizontal the vertical and the tuner section will not turn on. usually the cause problem like this is bad horizontal output transistor and an open resistance circuit going to transistor.check also for an open or defective resistor replaced it with same value.hope this can be helped just let me know if it works feel free to ask further solution thanks for using the fixya service good luck.
It sounds like something in the set has failed. These newer TV's have shut down circuits that won't let the set come on if there is a short or excessive voltage somewhere in the set. Most failures in TV's occur at the moment the set is turned on.
It could be a dry solder joint on the base socket pcb. Try resoldering the base socket, and try for dry joints on the main board also. Check if the rgb voltages are steady on the crt driver transistor bases.
This can be caused not enough high voltage going to the picture tube. If the picture seems to get larger and smaller depending on the brightness of the scene on the screen that is probably what it is. IF that is the problem, there isn't much a normal consumer can do.
I think its the flyback and its starting to leak. this is a component responsible for the high voltage of your tv set. always observe safety in dealing with this. Have it check by a qualified technician. Good luck!