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Our nearly 2 year old TV runs fine for an hour or so then it just shuts off. The on/off light flashes and the TV tries to come back on. If we turn off the TV for 5 minutes and then turn it back on it will work fine for a while but then the problem repeats.

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Your power supply is going out. If you are familiar with electronics it is an easy fix right now. The electrolytic capacitors on the power PCB (printed circuit board) are drying out, they are easy to spot. Make sure you unplug the TV, remove the back cover, then the power supply PCB is the one the power cord connects to. You should wait a few minutes after unplugging the TV as some capacitors keep some "juice" after the TV is off. Now look at the capacitors (they look like small sized barrels or cylinders), you might notice bulged tops (flat ones are usually ok). capacitors have values in capacitance (microfarads) and ratings in voltages for example: 1000 microfarads/150 volts. The replacements must match both parameters and size if the space is limited.
Capacitance checking with a multimeter that features this option is easy and fast, and will provide you with a better indication of pass/fail. Try MCM electronics for those capacitors. (just Google it).
If not comfortable, call a professional in your city. Other way to go allitle more expensive is to purchase the complete power supply PCB (10-20 times as expensive).
Good luck!

HDalacarte.com guy, audio/video/computer technician for over 30 years

Posted on May 26, 2011

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