Question about LG RU-52SZ51D 52" Rear Projection HDTV-Ready Television

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Shuts off on its own.

Replaced lamp and reset lamp counter, but it still powers down after a period of time. [ times vary ] how do i fix this issue?

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This can be from a number of issues. I must answer you genericaly, because I have no service information for your model type or worked on the model you have.


Common problems that cause power down for the lamp:

Failing power supply, most likely due to components that are changing spec with temperature. These are parts that have become thermo sensitive.

The lamp or its load effect is causing some over heating in the unit, or one or more of the boards themselves are overheating. This can be from a cooling problem. It is very common that maybe a cooling fan is not functioning properly. Faulty components in the power supply, or the lamp supply can also cause this effect.

A defective lamp can also cause the power supply, and or the lamp supply to go in to protection mode.

The service tech would start by replacing the power supply for the lamp, and testing the cooling fan's performance. He will also try a new lamp. If the unit still has a fault he will try the main power supply. The next step is to start replacing modules (boards) to find the one that is cauing too much current pull.

After the unit is serviced and apears to be working, the service tech should run a temperature test on the unit over a number of hours to make sure that there is no overheating. He should also run a current draw test to make sure that the set is in specs.


Jerry G.


Posted on May 13, 2008

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I don't know your set in particular, therefore I will be generic.

On some projection sets, there is an hours counter that is manualy resetable. Make sure that it is reset. If you can have a readout of the amount of hours used on the lamp this will tell you if this needs to be reset.

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