Connect with us

Samsung LCD TV

Discussion in 'Troubleshooting and Repair' started by Olddawg, Oct 28, 2012.

  1. Olddawg

    Olddawg

    4
    0
    Oct 28, 2012
    recieved this un19D4003 Samsung LCD TV about a week ago and would not turn on.
    No standyby power, nothing.

    No physical damage apparent to any components and played a bit with connections to see if any where loose.

    Tested around the inverter board (board that wall power enters first) and found some power, but not rates I thought I would see.

    On a leap of faith, I replaced the inverter board.

    Now I have a start-up, but run for only 30 seconds before it shuts down.
    Wait 1 minute and I can repeat the process.

    Here's what's baffling me.

    I plug in the TV and it powers right up.
    Not to stand-by, but staright to run.
    Thinking this could be in the switch,
    I dis-connected the switch.
    Went straight to run, ran 300 seconds and shut-down.

    No change in action.

    Before I replace the other board (where tuner is), I thought I would ask your opinion.
     
  2. enothor

    enothor

    4
    0
    Oct 28, 2012
    Almost definitely the power board.
     
  3. Olddawg

    Olddawg

    4
    0
    Oct 28, 2012
    where the tuner is,,,?? What I would call the mother board??
    I'm almost scared to ask if I'm correct....
    Cost of the board, if I could get it, is the value of the unit,,,,

    Hmmm....
     
  4. enothor

    enothor

    4
    0
    Oct 28, 2012
    Not the main board, not where the tuner is. The power board with all the capacitors and transistors on it. The board that the main AC plug plugs into
     
  5. Olddawg

    Olddawg

    4
    0
    Oct 28, 2012
    Well now, that's the board I just replaced.
    I thought I may have a bad replacement board.

    Thank you for confirmation.
    Wasn't sure if I was just over-looking/over-thinking something more basic.
     
  6. vtiniall

    vtiniall

    3
    0
    Nov 6, 2012
    I have a 42 inch Samsung TV. I had the same issue with it turning on and then off within a 30 second time frame.

    When I look at the back, I taught it had blown something. There was a lot of dust around the heatsinks and small vents. I used a paint brush to remove all the dust I could.

    Once cleaned I reconnected the back cover. Sure enough that is what caused the TV to power on and off. Dust. As there is no fans to cool, dust just collected and caused it to over heat.
     
  7. Olddawg

    Olddawg

    4
    0
    Oct 28, 2012
    Apprieciate this!

    I have blown out the unit and still happening.
    I've tested across all the resistors, transistors and diodes on the power board and have not found a problem. I'm testing the mainboard next.

    I don't know how to test a relay and those chips are beyond my knowledge..

    I've read about backlight testers that you can build.
    Does this site have a link to one that you all use?
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-