Get yourself a can of pressurized air or dust remover. Open the DVD drawer and insert the stray of the dust remover can into the unit through the open DVD drawer and dust away. Spray it real good - be careful not to invert the can as the compressed "liquid" air will deposit frost and frozen moisture on your unit's components. Works for me!
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I have repaired two different LRM-519 that both had the same problem. The repair was a simple replacement of two capacitors on of the power supply board of each unit. You can search the web for repair instructions, or even search youtube for a video of the repair.
If you have the same problem I had then when you turn on your recorder it will only display the Hello message on the front of the unit (perhaps very dim) and the blue light on the power button will come on. Your next step is to open the device (about 7 screws) and slide the top off, then examine the tops of the capacitors on the power supply, if the tops of one or more are bulging up then this is a good candidate for attempting this repair.
For parts I found some on ebay and searching the web. If you don't want to do the repair yourself I have also seen people offer the power supply repair on ebay.
follow directions from the owners manual. while unit is powered up, unplug power cord from back of unit - wait 5-seconds. Depress the DVD open/close button while re-plugging the power supply cord to the unit. LG splash appears onscreen and unit goes into re-set. you do not loose any of you programing or settings.
be sure to check and see if any of the capacitors get hot because once they reach a temperature beyond 105 degrees C. they are basically no good and don't work nearly as well as when they were first manufactured. Also you may want to make sure that you have soldered the capacitors with the long black line on the same position that is engraved on the circuit board where they are supposed to be mounted too.