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plpsanchez
Forensic Expert
Last Activity: 02-16-2016, 11:02 AM
Joined: 01-16-2015
Location: Sao Paulo
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  • plpsanchez
    replied to Samsung PL51E8000 - Everything works but video.
    in Troubleshooting TVs and Video Sources
    Re: Samsung PL51E8000 - Everything works but video.



    Yes, I do get all of them. Perhaps THAT is a clue .



    Yes, they do!!!

    I was going to check the logic board, as you suggested, but know what? When I'd put the cable back I noticed a small particle of something dropping to the floor.

    Was it dust? Solder? Metal fragment? A gremlin ? I did not find it, so I do not know what it was.

    But now the TV is working. Let's be thankful and just see if stays that way.

    Thank you...
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  • plpsanchez
    started a topic Samsung PL51E8000 - Everything works but video.
    in Troubleshooting TVs and Video Sources

    Samsung PL51E8000 - Everything works but video.

    Hi, everyone!

    I had a fried Y-main (Y-SUS) board.

    At first, I replaced Y-buffer and Y-main, then found that the new Y-main had a partial short circuit (50 ohm) from VS to GND, so replaced this boad again. Replaced also X-main, although I had no evidence of problems with it.

    But I still have problems because the TV does not turn on.

    To trick the logic board, I disconnected the cable that goes from Y-Main to the logic board (see red arrow in the attached picture).

    With that cable disconnected, everything works, except for the...
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    Last edited by plpsanchez; 01-19-2015, 01:14 PM.
  • plpsanchez
    replied to VS too high !
    in Troubleshooting TVs and Video Sources
    Re: VS too high !

    The board is rated 207V at 1.1A.

    Tested the board using a 500R, 2.5A, rheostat as a load. See picture.

    Adjusted the rheostat to 415 ohm to get a expected load current of about 0.5A.

    The power source works nicely, 207V at 0.5A, and I was able to adjust all voltages to the correct values.

    Still does not know what is the problem with the TV. The problem is not the SMPS for sure, so I will start another thread.

    Thanks for the help!...
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  • plpsanchez
    replied to VS too high !
    in Troubleshooting TVs and Video Sources
    Re: VS too high !



    Manufacturers are also fully exploiting planned obsolescence in a way that I prefer call it programmed self destruction. So maybe it can be regarded as an advantage anything that tends to disrupt a working device.

    Perhaps in societies where perfectly functional equipment is thrown away in little more than one year just because there is a new model in the market, really doesn't make sense produce anything durable.

    Unfortunately......
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  • plpsanchez
    replied to VS too high !
    in Troubleshooting TVs and Video Sources
    Re: VS too high !

    I mean, bad load regulation.
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  • plpsanchez
    replied to VS too high !
    in Troubleshooting TVs and Video Sources
    Re: VS too high !

    Thanks!

    @tom66 , the part is a BN44-00511A.

    @drussell, I was wondering about that. But a voltage supply that drifts that much, with such bad line regulation, does not seem a good design to me...
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  • plpsanchez
    replied to VS too high !
    in Troubleshooting TVs and Video Sources
    Re: VS too high !

    By the way, I have been unable to reduce VS using the VS-ADJUST trimpot. The trimpot is already at the minimum.
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  • plpsanchez
    started a topic VS too high !
    in Troubleshooting TVs and Video Sources

    VS too high !

    Hi !

    I have been strugling with a 51 inch Samsung plasma ( PL51E8000 ).

    Replaced both Y-MAIN and X-MAIN boards, then before puting everything to test, I decided to check PSU voltages because I knew VS was about 212V, above the specified 207V .

    So I kept the PSU disconected from everything else, put a jumper connecting PSON to ground and another connecting VSON to 5V STDBY.

    Measured VS, it was about 212V. I left the board on for a few minutes and VS got to 223 V !!!

    I don´t think it is a good thing to have such a high...
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  • plpsanchez
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    OK,

    Pedro Sanchez, from Sao Paulo in Brazil.

    Electronics engineer, professor of electronics, too much stubborn to retire :-) , also attorney at law but what I relly like to do is a lot of forensic engineering.

    Very happy to participate in this forum.
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