Re: Lg 50pz550
Hey Tom let's see if I can upload some pics from my phone. Took pics of the back panel off with close ups on the y and z sus boards. On the screen the line was a bit above on the top half of the screen. It went left to right and the thickness was about 2cm and it was also squiggly. If I recall the 2nd time I turned it on when the loud sound happened seems to be coming from the top right part of the screen, where the y buffers are. Is it possible that the y buffers could be causing an issue? or the main board? I do know that if the main board is not plugged in to the...
migimara
Member
Last Activity: 11-21-2013, 05:36 AM
Joined: 09-10-2013
Location: Pacifica, California
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Re: Lg 50pz550
Alright I think I've just about had it. Got 2 new y and z sus boards today and it seemed to power on for about a minute but there was no picture or sound so I turned it off. I turned it on again I saw the screen come on with a black thick horizontal line on the top half of the screen then the speakers made a loud growl noise... Then the z sus popped yet again. Took off the back panel unplugged the z board and tempted to turn on the TV again. It turned on for a couple of seconds then the middle black bar thing on the y board sparked at the tip of the black thing. It's...Leave a comment:
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Re: Lg 50pz550
Alright I'll test the boards when I get home. What I'm puzzled about is lets say both boards are placed simultaneously, what would it mean if it fails again?Leave a comment:
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Re: Lg 50pz550
Hi Tom thanks for the input. By chained recovery energy, do you mean since the z sus connects directly to the y sus that one or the other may be fried out? Now why would that happen? What's causing it to spark?
On a side note, after the z sus sparked I disconnected it from the y board and after a few minutes attempted to turn on the TV. For maybe 2-3 seconds it powered on without the z sus and noticed the led on the logic control board turned green then everything went off and now having the repeated symptoms.
I did notice though.. The z...Leave a comment:
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Re: Lg 50pz550
Ok another update. Replaced the y sus board again and it appeared to turn on then it popped again coming from the z sus board.. Any ideas? Could the buffer boards be acting up? Cuz I'm completely out of ideasLeave a comment:
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Re: Lg 50pz550
Yea I tried disconnecting that too, same result.Leave a comment:
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Re: Lg 50pz550
Seems like I blew the y sus board I originally bought. The new psu board that came today seems to be having the proper voltage. The spikes I was getting before aren't happening anymore. Tried powering on the TV without the y buffer boards attached and its still clicking on then off.
I'm completely stumped now.Leave a comment:
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Re: Lg 50pz550
I think I may have found some thing wrong. I took the multimeter and tested where the y sus board connects to the psu board. Tested both the VS jumpers and noticed a big spike in voltage before it comes down to 199/200. Is this normal? I know when testing the test points the voltage doesnt spike so I was wondering if they're related in any way.
Spikes to around 600v and 300vLeave a comment:
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Re: Lg 50pz550
I edited my previous post. But to add on, seems like I can't test z sus without the y sus, since the z board is connected to the y sus board.Leave a comment:
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Re: Lg 50pz550
Yea I edited last post. Get around 54 for va and vs 199. It never exceeds 199 though the panel says setting should be 203 v.
Edit
I think I may have found some thing wrong. I took the multimeter and tested where the y sus board connects to the psu board. Tested both the VS jumpers and noticed a big spike in voltage before it comes down to 199/200. Is this normal? I know when testing the test points the voltage doesnt spike so I was wondering if they're related in any way.Last edited by migimara; 09-14-2013, 11:51 PM.Leave a comment:
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Re: Lg 50pz550
Thank you very much! Just tested the va and vs and I get nothing. Maybe a spike to 3.5 volts but nothing other than that. Safe to assume this board is bad?
Edit
Nvm it seems like it wasn't on when I was testing. Va tp I get about 54/55 volts and on the vs tp I get around 201 ish never exceeds 203...Last edited by migimara; 09-14-2013, 11:07 PM.Leave a comment:
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Re: Lg 50pz550
Went ahead and disconnected the z sus and y sus board. Tv stays on. Connected the z sus board tv stays on. Connected y sus TV clicks on and off. Where would I check the vs and va output on the pus?Leave a comment:
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Re: Lg 50pz550
Just wanted to update. Power supply board hasn't came yet but the y sus board did. I replaced the y sus board and attempted to turn on the tv again with the back cover off. I turned it on and it seem to have worked until I saw a spark from the Z sus board and the tv turned off. It is now repeating symptoms. Did I fry something? Also how would one go about checking proper voltage output? I do have a multimeter and would to check things out before it gets pricey..I can already feel like I may have to replace the y and z sus boards again.. Thanks!Leave a comment:
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Lg 50pz550
Hello all I bought this TV off this guy for $200 on Craigslist who stated that the tv would click on then turn off. I've read on this forum about the z sus board being the issue so I ordered the part and replaced it but the problem was still there.
I read a bit more and tested the capacitors on the original board and it seems like the z sus board was good after all.
I noticed as I turned on the tv, it would click then the speakers I believe would Make a hissing noise then click off. I've gone ahead and unplugged the wire connecting from the power supply board to... -
Re: New Members - please post your introductions here
Hello! I am new here and the name is Mike. I've been scrounging around this forum for information and I am quite impressed by the vast amount of knowledge here. I hope to learn more and become an avid trouble shooter!Leave a comment:
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