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Samsung ln46d630m3f sound no picture

I held a flashlight by it and can see images on the LCD screen. I am trying to isolate between the power supply board and the inverter board. The power supply board says CNI801 high lead output rating is 273VAC and the low lead ratin is 193VDC. Both are reading ~10V AC. I am not getting any high voltage out on the inverter board.

Posted by Pat Hamrock on

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Larry

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What's the part number of the power board? Not sure where it would have said that connector 801 has 273 VAC as it would be impossible to get that voltage from a modern power supply board, max would be 120 volts ac times 1.4 or about 165 vac

Posted on Nov 24, 2021

  • 7 more comments 
  • Pat Hamrock
    Pat Hamrock Nov 24, 2021

    Power supply board is BN44-0463A Rev 1.2. The voltage I referenced is the voltage rating stamped on the board, may not be the actual expected output voltage. Pictures attached.





  • Larry Nov 25, 2021

    I pulled up service info on the power board, I didn't realize this set had CCFL lamps, thought it was LED, when you test the output voltage that is supposed to be 273 VAC what are you using for a ground?

  • Pat Hamrock
    Pat Hamrock Nov 25, 2021

    I’m using the ground pin on the same connector.

  • Pat Hamrock
    Pat Hamrock Nov 25, 2021

    It is pin 8 in the photo. I could not find the service online.

  • Pat Hamrock
    Pat Hamrock Nov 25, 2021

    And…thank you for the responses!

  • Larry Nov 26, 2021

    Your welcome! if you look at the board you will see a white line across the connector, the top part is the cold and the bottom is the hot side of the power board. When testing the cold side you use the frame or the ground pin to test but if testing the hot side you can't use the frame as the ground as the PWM section is isolated from the frame ground, you need to use the minus side of one of the large capacitors. A word of caution be very careful when doing that test as the hot side of those caps will have around 380 VDC and that really hurts if you get across it and it can be really dangerous. I have a feeling your power board is working ok and you have bad CCFL, most likely one is bad and drawing to much current and the inverter board is going into over current protection, another thing to check is the ballasts on the inverter board, see if any have got hot. One other thing, are the lowerpower supply voltages ok

  • Pat Hamrock
    Pat Hamrock Nov 26, 2021

    Thanks for the follow up. I’ll check those items this morning.

  • Pat Hamrock
    Pat Hamrock Nov 26, 2021

    We’ll, while checking voltage w/ multimeter I had an arc on a cap lead to the probe and now appears power board is out completely. Set will not power on anymore.

    I appreciate your input, but thinking it’s time to give up on this one.

  • Larry Nov 27, 2021

    It's really easy to get between the plus and minus on the large caps as the leads are close together, I've had it happen several times when I wasn't careful enough, chances are it took out the fuse and rectifier diodes, I agree unfortunately it may be time for a new TV

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Your LCD backlight capacitor is bad somebody will have to locate it and put a new one in

Posted on Nov 26, 2021

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