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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1,Turn the projector on,press the Menu botton
2,Press the Left ,Right,Up or Down to find the "lamp usage" and the reset option.
3,select "Lamp replacement counter Reset ?"
4,select "Yes"

Jerry China
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hi,
Did you rest the lamp hour after replacing the lamp. It is recommended the you have to reset the lamp hour after replacing the lamp. For resetting the lamp hour do the following.
1. Power ON the projector
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Lamp Replace Counter
Be sure to reset the lamp replace counter after Lamp Assembly is replaced. When the lamp replace counter is reset, the LAMP REPLACE Indicator stops lighting.
Note : Do not reset the Lamp Replace Counter until after the projection lamp is replaced.
1. Turn projector on, press MENU button to display the On-Screen Menu. Press Point left or right button(s) to move the red frame pointer to the Setting Menu icon.
2. Press Point down button to move the red frame pointer to "Lamp counter reset" and then press SET button. The message " Lamp replace counter reset? " is displayed.
Move the pointer to [Yes] and then press SET button.
3. Another confirmation dialog box appears and select [Yes] to
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Note : Do not reset the Lamp Replace Counter until after the projection lamp is replaced.
This projector uses a high-pressure lamp which must be handled carefully and properly. Improper handling may result in accidents, injury, or create a fire hazard.
 Lamp life may differ from lamp to lamp and according to the environment of use. There is no guarantee of the same lifetime for each lamp. Some lamps may fail or terminate their life in a shorter period of time than other similar lamps.
 If the projector indicates that the lamp should be replaced, i.e., if the LAMP REPLACE INDICATOR lights up, replace the lamp with a new one IMMEDIATELY after the projector has cooled down.
( Follow carefully the instructions in the LAMP REPLACEMENT section of this manual. ) Continuous use of the lamp with the LAMP REPLACE INDICATOR lighted may increase the risk of lamp explosion.
 A Lamp may explode as a result of vibration, shock or degradation as a result of hours of use as its lifetime draws to an end. Risk of explosion may differ according to the environment or conditions in which the projector and
lamp are being used.
IF A LAMP EXPLODES, THE FOLLOWING SAFETY PRECAUTIONS SHOULD BE TAKEN.
If a lamp explodes, disconnect the projector's AC plug from the AC outlet immediately. Contact an authorized service station for a checkup of the unit and replacement of the lamp. Additionally, check carefully to ensure that
there are no broken shards or pieces of glass around the projector or coming out from the cooling air circulation holes. Any broken shards found should be cleaned up carefully. No one should check the inside of the projector
except those who are authorized trained technicians and who are familiar with projector service. Inappropriate attempts to service the unit by anyone, especially those who are not appropriately trained to do so, may result in an
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