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Simultaneously press and hold the Power and Volume down buttons for 12 seconds or until the device power cycles. If it is frozen on the logo, do the aforementioned and then just release the power button when the logo appears.
Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis.
Are you sure that the battery is in tightly and is not moving slightly causing the phone to shut down?
Otherwise, please repost your question and tell us the product's brand and model.
After reposting a new question we can troubleshoot your specific phone.
Thanks!!
EJ Kudelka
Any electrical device which shuts down after a period of time is usually over heating. Turn the device off, clean out all fans and vents on the device with compressed air and move any other objects away from the device so that it has room to breathe. If this works then you need to keep the device away from other electrical equipment and keep the fans and vents clear for air to circulate.
One reason may be that you don't have the tv plugged into a surge suppresor. If you don't have one, its advisable to get one, as lcd's/plasmas are quite susceptible to small power spikes.
Try unplugging the tv for one hour, then plug it in and see if the tv corrects its own issues.
If that does not resolve the issue, pay attention to the number of times the power light blinks before shutting off. Thats usually a 'fault code' for troubleshooting a more indepth problem with the machine.
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