After about 30 minutes of watching tv, we hear a loud pop and the screen goes blank. The power button remains green, but we have to shut it down for about a half hour then it will turn back on. We need to do this a couple times during the day. What is going on.
Its is a cold solder joint on the board. The board is the one located at the bottom right of the tv when looking at the rear. Mine did the same thing. After refreshing mose of the large solder pints on the board, it stopped. Hope this helps!
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It can be a couple things. Something bad on the power board. Or the vertical output circuit. How long ago did you purchase the television. Your best course of action is to have it serviced. If you need any information or other assistance let me know. Thanks, Lee
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
It sounds like one of the Electrolytic Capacitors in the TV has gone, this can be caused by voltage fluctuations, Ambient Temperatures around the TV and sometimes they just fail for no apparent reason. If you are handy with some basic electronic tools you could open the back of the TV and you would possibly see the remains of the blown component as bits of paper like material around where a capacitor used to be.
The power supply board is dead.Those high voltage transformers on the power supply board,one those power coil have a short in it,that why it cause this shutdown a have a loud electrical current noises.Tries websites like Shopjimmy.com.Ebay.com to buy a new refurbish power supply board for the replacement,should solved this loud electrical noises shutdown to tv.
This looks as if a component has become thermally sensitive. The best way to find this is to use component cooling spray. It looks as if the problem is localized to the tuner section. Take the back off of the TV and turn the TV on, wait until the problem occurs and lightly spray the tuner section with the component cooling spray watch for any reaction, then if this does not work spray the Microprocessor and the LVDS section and watch for a reaction. The set should go back to normal when it does that section is the problem, try to localize the problem to one component. Then replace that component.
For the first one, please list the model number and count the blinks. Also, can you please post each problem separately. It will get too confusing trying to address 3 sets with different but similar problems.