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George266
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Last Activity: 12-01-2016, 10:33 AM
Joined: 04-30-2014
Location: Manchester
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  • George266
    replied to eax64905001 No Pfc Help ?
    in Troubleshooting TVs and Video Sources
    Re: eax64905001 No Pfc Help ?

    Hello,
    I have got the same problem here- LG 32LN570R, but the board is the same tan the one mentioned in the comments above.
    The PSU board is eax64905001 ver. 2.4
    I can see the image on the display when I use torch , therefore the Backlight is not getting voltage I believe.
    I have measured the voltage to backlight, which fluctuate between 11V -21V
    Other voltages on PSU board seems to be right 3,3V , 3,47V , 12V and 24V.

    Any ideas which part is causing this ?

    Thanks for any help
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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    It is very difficult to actually see if the conductive part broken, even if I put LED torch behind the ribbon i Can't actually see the breakage. The conductive part is definitely exposed as the top layer bubbled and rubbed through. I believe this happen when you grab and squeeze the screen by palms when moving etc..
    I am still tempted to get a new buffer as I can't see the conductivity breakage yet ..
    Eeehm , will have to think about if is it worth the risku buying the part.

    Tom , if you still have the panel...
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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    It is hard to get really close image with standard camera but actual top plastic layer is broken and the conductive part of the ribbon is exposed. The only thing which baffles me is:
    1.) why the bottom buffer died when the damaged ribbon is connected to the top one..
    2.) Why I am not getting image at least on part of the screen?

    Any Ideas?
    See more | Go to post
    Last edited by George266; 06-04-2014, 02:20 PM.

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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required ...
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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required ...
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    Last edited by George266; 06-04-2014, 12:53 PM.

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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    I have just disassembled the panel and I have found some suspicious damage. Here are the pictures:...
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    Last edited by George266; 06-04-2014, 12:52 PM.

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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    Hi all,
    Now after I have replaced the YSUS the second time (after the first seller from Ebay send me a faulty one) and I am finally getting the right voltage on the resistors VY=189.3 VSC=159.6

    Hoverer, when I plug the bottom buffer into the YSUS -->the both VY and VSC voltages drops to nearly 0V .The results are same when I unplug the ribbons which are going to the panel .
    Voltages are fine when only the top buffer is connected.

    This leads me into conclusion that the bottom buffer is shorted....
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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    Which components on Ysus do you usually check for shorts Tom ?
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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    I have just checked the panel, there are no cracks. Just wondering is there any way to check if the Ysus is okay?
    Just thinking -could bad buffer damage the newly installed Ysus?

    But as you said- it could be the ribbon cable. I have read your your post where you have mentioned it . Actually, the VS voltage is nearly 0V with ysus connected , buffers disconnected -therefore bad Plasma panel shouldn't affect it as there is no connection between ysus and panel ?
    See more | Go to post
    Last edited by George266; 05-01-2014, 04:03 PM.

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  • George266
    replied to LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources
    Re: LG 50PA650T Plasma- Help required

    Thanks Tom. The Buzz is not as loud as the one on the video -but in quiet room with volume muted it would be noticeable if not annoying. Thing is, the ysus makes buzzing noise even when the buffers are disconnected.. But I will check the screen for cracks too
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  • George266
    started a topic LG 50PA650T Plasma- Help required :)
    in Troubleshooting TVs and Video Sources

    LG 50PA650T Plasma- Help required :)

    Hi all. I have got [B]LG 50PA650T Plasma TV[/B] , but i am somehow stuck
    .
    The plasma does turn on (relay click) but turns OFF after about 4 seconds ( another relay click) . I ca hear Y-Sus board buzzing but NO image at all , JUST audio. Then I have disconnected both buffers and the result was exactly same.
    [COLOR="Black"]Voltages:[/COLOR]
    VS 1.1V
    VA 3.4V
    M5V 5.2V

    Just to make sure the power supply is okay I have unplugged the Ysus and connected 100W bulb into VS output a the bulb did light up bright....
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  • George266
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    Hi all. First of all I want to say Thanks to founders of this great forum which helps amateur ''engineers''.. My name is Juraj I am 33 years old, originally from Slovakia. I have studied Industrial Automation, and like building and fixing different things - not only the electronics. At the moment I work as an AV engineer in UK , but we only install things we don't fix them. We do bin 1-2 years old faulty TV/Plasma sets which seems to be pity. I have got good soldering skills from college as I have build few amplifiers from scratch...
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