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I have a 3 year old LG 50pt350 plasma tv. I just tried to turn it on, I only got sound, no picture. Never heard a "pop" per say. The screen stays "off" there is no glow, nothing. After doing some research I believe this is caused by a faulty YSUS board however LG recommended replacing the main board. Would replacing both buffer tubes be necessary too? What would you recommend I try? It appears there isn't a way of testing a YSUS board. Thank you, Nick

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  • Nick chapman Dec 04, 2014

    Okay, I removed the back panel. Visually everything looks fine. No capacitors are bulged out or burnt looking. All wires seem to be in place and plugged in. I have to assume this means a board will need to be replaced.

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Many LED TVs and other electronics have bad capacitors on their power supply boards. You can visually inspect them by opening the TV and looking for capacitors with bulging tops. If tou see any, replace them all in the power board section. Check to see if your TV is still under warranty first though.

Posted on Dec 03, 2014

  • 1 more comment 
  • Nick chapman Dec 03, 2014

    Thank you for the input. Unfortunately my warranty has expired well over a year ago. I will check the capacitors tonight as I plan on removing the back cover.

  • Nick chapman Dec 09, 2014

    bryan, I replaced the y sustain board per recommendation from shop jimmy. No luck. Same symptoms. Is it possible to have a bad power supply or main board? Remember, I get sound fine. No picture at all. Thanks!

  • Bryan Smith Dec 09, 2014

    How do the fuses on the circuit board look? Test them before replacing any capacitors.

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Posted on Jan 02, 2017

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SOURCE: 42 inch LG Plasma TV - Lost picture

Our LG 50" plasma tv screen went black after a popping noise but still had sound, after great diliberations decided to take the back off and have a peek!
We unplugged the tv and tested the fuses (there were three we could see) one had blown, the one on the left as you look at the back of the tv it also has one above it. We wrote the code/seriel number down and took the fuse to the electrical wholesalers Maplin and bought a pack of 10 fuses for £1.29 replaced the fuse in the tv and everything now fine!!!!!!
Hope this might be of use to anyone whose lost the picture after a loud popping/snacking noise but still has sound.

Posted on Jan 17, 2008

  • 5 Answers

SOURCE: LG 50" plasma tv

call 877-543-8325 this is an LG Executive call center and they will fix this for free. I have a 50" plasma I bought january 2006 which is out of warranty by 5 months. They faxed me and the LG repair shop a 30 day warranty for my tv to cover the repair. Just tell them you heard a pop and in my case the picture is distorted. All they need is the model number and serial number and they should take care of it. No arguing needed.

Posted on Jun 03, 2008

  • 1 Answer

SOURCE: LG 50PX4DR plasma tv

I had the same exact problem as posted above. My 50" LG plasma was out of warranty for 1 year! I called the LG executive call center, and they were very helpful. They offered to pay for the parts and labor. They recommended a few local repair shops, and they set everything up for me. The tech came out within 4 days with one part. The tech had to come out one more time the following week, since more parts were needed for the repair. The Y sustain board, along with 2 adjacent parts that are required to be replaced as a set, and the power supply had to be replaced (parts alone cost just over $900). TV is like new again; I'm very happy with how LG handled it, and made what could have been a bad experience a good one.

Posted on Apr 30, 2009

  • 41 Answers

SOURCE: LG plasma TV turned off, after the picture very light

I think you have a defective power board. the pop sound in coming from the board and giving you a low output voltage. do it yourself price about two hundred for parts.

Posted on Mar 13, 2010

SOURCE: I have a LG 42PC3D-UE that is about 4 years old.

After 13 months of ownership (just past the warranty expiration) my LG Plasma TV developed a serious problem. These include picture degradation, shutting down at random, screen lines, color degradation and others. We systematically applied solutions such as switching cable locations, using different cables, trying a variety of power supplies (basic strips to battery backup) and nothing seemed to help. We observed the TV in different modes and kept having the same problems whether we were using the Set Top Box (cable), the DVD player or the gaming system. One observation stuck out form the rest - the problem did not occur when we were watching a black and white movie. But as soon as the film ended and we switched to a color movie, the screen popped and went blank.


I started researching the issue on-line (thank you Google!) and after some trial and error with search terms eventually discovered other plasma television owners with similar problems - some have been kind enough to post pictures and videos that allow me to see the same problems as my plasma TV. Further investigation revealed that a common culprit appears to be the Y and Z Sustain Boards. These circuit boards are akin to the vertical and horizontal deflection circuits of older televisions and are at the heart of creating a picture on the screen.


Unfortunately, the Y and Z Sustain Boards (more simply called the YSUS and the ZSUS) are a serious weak point in ALL plasma televisions. Do a Google search for problems with plasma televisions or problems with these boards and your search results will light up with hits! Information about problems with these components span years of plasma manufacturing and cover a wide variety of brand names. The worst offender seems to be LG - especially since they manufacture these boards as components for many other brands and have been doing so for many years.


Doubly unfortunate is that this problem seems to be rampant in the plasma television industry yet no one seems to know about it. It does not seem to be a safety issue (no fire hazard, etc.) so the Consumer Product Safety Commission has no information on it, it is a standard component of larger items with no particular brand involved, so the Better Business Bureau has no records on it, and the issue is spread out and technical enough that the average consumer seems to be unaware that it is such a large issue. How many plasma TV owners have to have this problem before it becomes general consumer knowledge?


In other words - this is a KNOWN ISSUE with plasma televisions yet it has somehow fallen through the cracks of consumer knowledge and the plasma manufacturing industry is certainly not be\ringing to anyone's attention.


A call to LG customer support was less than helpful. The customer service representative on the other end of the line had no information on this issue (even though it is quite common). I knew more about the inner workings of my television than he did. The LG warranty does cover the "Panel" for a two year period - and these components would appear to be core to the "Panel" - but the service rep I spoke with could not provide me a definition of what is included as part of the "Panel".


To put this in perspective, my family once owned a Sony Trinitron for nearly 20 years before it was replaced and our former primary television (still in service) is a nearly decade old Sharp CRT unit. Neither of these units developed the problem this LG Plasma is having and neither ever needed to sort of repairs (both dollar and labor wise) that this plasma unit needs. So yeah - this is big deal. When I spend the kind of money necessary to purchase a product such as a television, I expect to get more than 13 months of service out of it. I intend to get this unit repaired or replaced and I do not intend to be the one paying for it!

Posted on Dec 26, 2010

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The boards responsible for sending signals to your plasma screen has gone bad. Technically speaking, the Y SUS, Z SUS and the Y Buffers are suspect. Sometimes, owners heard a popping sound then the display will go away leaving only sound. It's an expensive repair that can go upwards of $500. Fortunately, LG typically has two (2) years parts and labor warranty for their big screen TVs. LG has a strict repair turn-around time so call it in and you'll have your TV fixed in no time... (realistically, 5-7 days). Best Regards


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call 877-543-8325 this is an LG Executive call center and they will fix this for free. I have a 50" plasma I bought january 2006 which is out of warranty by 5 months. They faxed me and the LG repair shop a 30 day warranty for my tv to cover the repair. Just tell them you heard a pop and in my case the picture is distorted. All they need is the model number and serial number and they should take care of it. No arguing needed.

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