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A DIY repair kit for a common problem in LG 50PJ550 plasma TV resulting in a clicking, but failing to start TV

Coppell TV Repair offers you a repair kit for a common problem developing in LG 50PJ550 plasma TV.

Failure types and symptoms addressed by the kit, repair task difficulty level and other related and important information can be found below.

As with all repairs please note that we can never guarantee that this kit is all that is needed to fix the TV. It is offerred based on experience and technical information available to Coppell TV Repair at the time of the listing. For details please see the warranty conditions section below.


Please note: Every failure has a component of randomness in it and as such you should be aware that failure symptoms may vary from one case to another. Sometimes the same components may fail in a different way and have a different manifestation of the falure. The opposite is also possible - the same visible symptoms may be caused by some very different failures.

Finding a failed component from one of the listed in the description is the best possible indication that the failure you have is the one targeted by this repair kit..

A typical symptom of a failed LG 50PJ550 TV that is addressed by this repair kit is a TV having standby power and attempting, but failing to turn on upon receiving a power on command.

You would hear the relay click and you may see the display flash (not necessarily), but then the TV would click back into standby mode.

An open fuse F302 or shorted diode D304 (located on the right side of heat sink HS2 toward the middle of the board) are a definite sign for the need of this repair kit.

Also an open wirewound resistor from the ones shown on the pictures (those are from the upper right corner of the board, next to the sustain power connector) is a definite indication for the need of this kit.
Those resistors normally have fairly low resistance and often times one or more of them would burn and open in a failure, very much like fuses.


Please note there are two different yet fully compatible PCB revisions for this power supply board.

The differences between them are minor yet both happen to be affected by this failure.

In a nutshell, some power boards have THREE power resistors in the upper right corners while others have TWO such resistors.

Those resistors have normally low resistance (under 30 ohms) and act like fuses. Finding one of them open is a good indication you need this repair kit for your LG 50PJ550 power supply.

Accordingly there are two versions of the kit - one of the PCB with 2 resistors and the other with 3 resistors.

Please make sure to look at your actual board BEFORE placing an order!


At the time of this listing's creation this kit contained 1 fuse (F302), 1 diode (D304), the power resistors as shown on the pictures (R927 and R929 for the board revisions with two resistrs) and the IC301 voltage regulator IC.

Not necessarily all components may be bad in your case, but we recommend replacing them all.

Contents may change as we gain more experience and see other commonly failed components and this listing may not necessarily be timely updated.


Basic to intermediate soldering skills level and consumer electronics grade soldering iron required to perform the repairs.


The free shipping and handling included in the price uses USPS First Class package within USA and possibly Canada.


We do not offer warranty for the components on the kit once you use any of them on a board.
We offer repair services for the board and when we do we give warranty on the final result.

Picture of Revision with 2 power resistors
Revision with 2 power resistors
Picture of Revision with 3 power resistors
Revision with 3 power resistors
LG (359)