Samsung LN52A650A1FXZA dead, standby LED just flashes repeatedly

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  • tvguy12012012120
    Zombie Samsung UN55NU6900F dead / no standby voltage - randomly came to life after hours of troubleshooting then died
    by tvguy12012012120
    This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.

    Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
    02-07-2025, 05:13 PM
  • fharris1977
    Vizio D50u-D1 Dead Set No Standby
    by fharris1977
    Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated.
    1 Photo
    12-28-2023, 10:25 AM
  • thstuff
    Sony OLED XR-77A80J - Initially dead, now 4 Flashes
    by thstuff
    A) TV initially dead
    B) On a hunch of a locked up Google OS, plugged in a USB memory stick with latest FW and plugged it in. It booted into the update screen, completed the update and restarted to Home screen.
    C) Was able to perform a Reset from Settings menu and completed out of box configuration.
    D) Ran a 4K screen saver demo for about 6 hours, then turned it off for the day. Did not notice any stripes, dead zones or other artifacts in the image.
    E) Powered back on and it now runs for a few minutes before relay clicks, screen goes blank, Main Board Red Digital Optical...
    12-26-2024, 09:10 PM
  • jacobtc
    LG C1 65'' dead standby
    by jacobtc
    I've owned this C1 from new since late 2021, and it has now suddenly started with the following symptom:
    If power has been connected for a while, the red standby lamp turns off, and the tv wont turn on (no reaction from remote or button on tv).
    If power has been disconnected for 5 minutes, the tv turns on fine, until turned off and left for a couple minutes, as the standby light will then turn off again.

    I've seached and found that this is most likely a failing PSU, and I've seen repair services on eBay fixing these symptoms, so I am hoping that someone here has fixed...
    01-29-2025, 04:27 AM
  • mecha1166
    QN750Q8FNBFXZA Service Error Codes Needed - Error code 1-3-1-2 ? Dead set, only blinking standby light in repeating sequence
    by mecha1166
    I am working on a QN750Q8FNBFXZA. Dead except the standby light. It blinks what appears to be 1 3 1 2. 1 long blink, pause, 3 short, pause, 1 long, pause, 2 short, pause, repeat. A service manual would be very helpful, or if anyone knows these error codes. Thanks!
    03-28-2024, 08:31 AM
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