Question about LG 50PX5D 50 in. Plasma HDTV

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50" flat panel picture problem

I just purchased (from an individual) an LG 50" flat panel plasma TV. I knew when I purchased it that it had a problem but the price was little to nothing for a very nice TV that they were not willing to try and get fixed. The problem is it shows a picture but it is really dark. I don't know the specifics on what occured when it went out (popping sounds, etc.) but I do know it wasn't dropped or any damage done to it to cause this. Any ideas?

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  • Gooroo Oct 25, 2008

    Update: I removed the back and checked the 3 fuses I found. All good. Are there more than 3? Also, I found a flat cable that looked to be disconnected. The only place that seemed feasible for it to go was to another board to the left of it. There was an open slot that the cable fit perfectly into. (Just for a point of reference: There was a group of wires right above this cable going the same way to the other board, as well) Well, I turned the TV back on and then I had a bright screen...in some areas. Most of the top half of the screen was black with thick white horizontal lines below that area with a couple of thick black lines in between. Turned it off and looked around for more disconnected cables, etc. Turned it back on and I noticed the sound was gone now. I pressed the TV Guide button on the bottom of the TV (right next to the Power button) and then started seeing a thick pink vertical line that moves around (as if slowly searching for something), as well. I don't mind replacing whatever is needed. Just need to know what's broke, etc. Help!



    Note: Every time that I've done anything involving the inside components of this TV, it has been unplugged.

  • Gooroo Oct 25, 2008

    (See update) I don't know how to check that but I think it's become a more difficult problem. :(

  • Gooroo Oct 25, 2008

    Would the replacement of this convergence IC also corect the loss of the AUDIO, as well as the video?

  • Gooroo Oct 25, 2008

    Where do I find the inverter and how do I check it?

  • Gooroo Oct 25, 2008

    The reason I mentioned the convergence IC was that one of the other experts here said that was the problem. Out of the 3 fuses I found, 2 were found on the Y sus board (read that off the board itself) and 1 off another board in the middle. Found none on the Z sus board on the left (expected to find 2, according to a post in the forum). Locating things would be helpful but knowing what needs to be replaced or corrected (based on what I've posted) would truly answer my problem.

  • Gooroo Oct 25, 2008

    The suggestion has been made to check that settings have not changed with the gamma or brightness. Unless these were changed by me checking a fuse or connecting a cable, everything should be just as it was. I would be glad to check these settings if I knew how. Would someone like to walk me through that. Keep in mind that I can't see anything on the screen. For instance, when I push Menu on my remote, it shows me nothing. Just what I described earlier (horizontal and vertical lines).

  • Gooroo Oct 25, 2008

    I already have an operator's manual but thanks anyway for the link.

  • Gooroo Oct 28, 2008

    I've removed the Y sus board, as that seems to be the consensus as the possible culprit (at the very least). Is there any way to test to see if the board is good or bad?

  • Gooroo Oct 28, 2008

    I talked to the original owner and he told me the specifics of when the set went out. He turned the Tv on, hear a pop and had a dark picture. Pretty common story with this model from what I've read. Anyway, back to my qustion, can the Y sus board be tested?

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There is already plenty of idea's on here, but having worked in the A/V electronic industry and offering a customer support besides my sales help, I would actually call the manufacturers and conference call with customers with similar problems such as this.

It is not a setting or mode you can change in the set.

It could be a few things. It is a parts issue for sure. You just need to narrow down what kind of part it is.

For a Pioneer plasma a guy had the same problem [well, a few times]. One of the guys had a motherboard problem where it totally needed to be replaced. That will create horizontal and vertical lines in your set. When you see color with that it is typically a Huge sign that is what it is.

Another error with a 60" plasma at one point was just the input terminal needed to be replaced. It appeared to show up the same errors lines, and colors. Any time you have red or pinks its a sign that one of those two things need to be replaced entirely. A popping sound can also be the fuse imploding, and since a plasma does not have a simple lamp to replace that is not the case so good job for checking the fuses.

Those two parts can typically be replaced, depending upon the product. A local authorized manufacturer repair center should be able to help you either order the part, or offer you a quote for how much it might cost you. But I can tell you these are not typically something you can always do yourself since it's a very delicate process--unless you already know how to of have history of repairing electronics. Otherwise it can do more damage then good. Plus plasma's are very delicate with all the gasses and glass tubes inside. Some times manufacturers have separate parts departments otherwise you would have to go through the local service center. It's best to find an authorized one since they are less costly and more ideal on whats going on with it.

Feel free to contact me directly with any more questions. I've worked for a projector manufacture and have a pretty good idea on how these electronics work inside/out very extensively. Also, it'd be great to rate me once you figure out those two suggestions offered above.

So its most likely either the mother board or the input terminal which need to be replaced. Good job for switching out the fuses. Also, what is the exact model #? I might be able to tell you if there might of been any recalls on that exact model since I've ran into plenty of issues with customers over the past five years.

Thank you for your time. I will try to check back to see how things are going for you. It can be frustrating!

Posted on Oct 28, 2008

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I think you better check that wirestrip you plugged back in , when we get the plasma in and there were missing lines usually the wirestrip was broke inside or punctured somehow( hard to tell just looking at it ,have to test it sometimes , also make sure the other side of the wirestrip is secure and that they are not off in there connection

Posted on Oct 25, 2008

  • jason Oct 29, 2008

    if the board is bad the only thing you can do is get it replaced

    none of the IC's on the board can be replaced , only the board

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Sorry to interject..according to my testing, the asker can NOT see all of these answers at one time..mr asker, if this is the case, rate my answer here as TFT

Posted on Oct 25, 2008

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So did any of the above experts' advice help? If not there's one last thing you can do before you call for repair. Adjusting though tv''s The service menu. But it is tough unless you know what are the exact settings. You can get them in a service manual though if you can find one.. If you are interested I can help you find one.

Posted on Oct 25, 2008

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Hello ,

This appears to be a problem with the back-light or the inverter. Which also includes the associative bias circuity. This only leaves you with two options depending on the cause of the problem and the type of unit that you have. First the good news. This is not an extremely hard problem to fix, and here is how to do it. Unplug the TV and using the schematic find the connections that lead from the back-light and the inverter to it control processor, in this path you will find that the processor is connected to a circuit whose function is to control the back-lights actuation. This circuit might be defective so check its voltages against the schematic, and take the proper action in replacing the circuit if it is defective. Now lets say that you find the circuit and determine that when it receives a signal it goes low turning on the back -light, what you can do as a test is to ground that connection and see if the back light comes on if it does the problem is in the circuitry (at this point I would suggest changing the module as opposed to changing the component due to the use of SMDs) Now if dragging the connection low does not work as a test, then the problem is with the inverter or the back-light which is where the two issues are presented.

Issue 1) If the back-light and inverted are physically part of the screen

Issue 2) The Inverter and back-light are separate from the screen

If issue one is the case, you might as well stop here because the screen and the attached devices are going to cost as much as a new TV.

If issue two is the case then you can remove the back-light and or inverter assembly and replace them, Yes I said them replacing both will save you a lot of headaches in the future.

Now I have to insert here that if you have a background in electronics then go for it , however if you do not, I would suggest that you have a qualified TV technician handle this job.

I hope this helps,

Thank you,

Shuttle83

Posted on Oct 25, 2008

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Hi, I believe this is the problem which is known only bu the core professionals..... I want you to refer to this page for info link 
The good way to solve it is to call your service center and get the help from them......... Hope my info helps you, Thanx for using fixya..

Posted on Oct 25, 2008

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Check out your settings, or ask for assistance from our chat experts. Thank you Hope this is helpful

Posted on Oct 25, 2008

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Dear

I attach a weblink , it is the user manual for ur tv.
u should read the picture setting for best display quality
it is easy to use

http://www.hdtvsolutions.com/pdf/50PX5D-0314-50px4dman.pdf

Posted on Oct 25, 2008

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Check if there any blown transistors or anything that not seem to be normal

also chek the wirs that dirctly connected to the lcd
and follow where the rca audio ports Tracks and see where they go and check if there any thing strange like a smell or smth like that

plz rate

Posted on Oct 25, 2008

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Make sure you havent changed the settings on your tv by lowering the gamma or brightness. Please check these two settings and let me know.

Thanks

Posted on Oct 25, 2008

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Plasma TVs do not have convergence ICs.
There are more fuses on the Y sus board that is located on the left hand side and the power supply is connected to the board.
I can send a service manual from and older model model to use it as a reference where the board are located and their names.

Posted on Oct 25, 2008

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You need to check the fuse and also inverter ?


Posted on Oct 25, 2008

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Its the problem of convergence in your tv.replace the convergence IC from any specefied mechanic to make it proper.so it will work prtoperly.it will not cost you heavy.

thanks.

Posted on Oct 25, 2008

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Have you tried adjusting the gamma and brightness /contrast levells?

Posted on Oct 25, 2008

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