Question about LG Televison & Video

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Why there is no video in my lg TV but with sound?

When I turn on the power the lg logo will appear then the screen will turn black. I can hear the sound mean the program is running.

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  • Aries
    Aries May 19, 2014

    Dear experts. Attached is the video of the issue. Please have a look and confirm if the problem is the BackLight LED panel or the Inverter board or the driver or just the energy saving mode. Thanks. Aries


  • Aries
    Aries Jun 01, 2014

    Hi Hector. I upload the video again. The LG technician explain me that this is a symptom of a busted bulb inside the backlight panel. When there is a busted bulb the control switch it off to avoid overcurrent. ANd it is not repairable and needs to replace the whole panel which is 1/3 of the original price. I'm still hoping it's just the inverter. THanks.


  • Aries
    Aries Jun 01, 2014

    Youtube link

  • hector62
    hector62 Jun 03, 2014

    way to know the cause, raising the overcurrent sensor pin pwm controller IC as it is protecting the Tv for failure. Send me the reference model or tv, LCD CCFL LCD or LED? to send you a diagram of how to isolate the fault.

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If the TV will not be turned off, then you have a problem with the card or inverter circuit, but prior check filter capacitors of the source (which are not embombados, loss of capacity), if you see well, now check the Inverter (there may be loose solder if the TV is new, especially in transformers high, a defective MOSFET, transformer and test compares the lamps)

Posted on May 15, 2014

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  • Aries
    Aries May 15, 2014

    Hello Hector. I can be able to turn off the TV. The unit is not new. This problem start happening after 3 years. I

  • Aries
    Aries May 15, 2014

    I checked all the components and the solder joints but I don't see any damaged part. I check the 3.5volts power for inverter and the power is ok. The LG technician come to visit the unit but didn't open the it. We just turn the power "on" and "off". Then he diagnose to have deffective LED back light. I was not convinced so i start checking online solutions. It looks like the LED is fine because when the I turn on the unit i can see the LG logo come out then black screen will proceed after that. I'm guessing that it could be a damaged controller(IC) or just the driver of the inverter board is corrupted if the IC is still ok.

  • Aries
    Aries May 15, 2014

    Model: 32LE5500. I was looking for schematic diagram to check component level but there was no luck for me.

  • hector62
    hector62 May 16, 2014

    Within the same source is the "smart module" that is responsible for controlling the power MOSFET to regulate LED HIGH GLOSS, which provide the light necessary and appropriate in the images received.

  • hector62
    hector62 May 16, 2014

    The LED's need to operate a common voltage is around 195V, which as mentioned earlier anger with each and every one of the rows.

  • hector62
    hector62 May 16, 2014

    As the control line, the voltage is about 2.5V has and this will be monitored by the mosfet.

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It sounds like the backlight is out. If you can see a faint image that changes then this is the case. You either need to send in for repair or replace. It can if you are lucky be a connection. You can try removing the video cable and try another source or cable.

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SOURCE: VIZIO TV Black screen. Cannot turn off TV without unplugging.

I had a similar problem after having a Vizio for 2 and a half years. I left the room for a minute, i came back and the screen went black. I didnt hear an arcing sound though. There was still power to the unit and you could see that the back light was working, just no picture, no sound, and you couldn't use any of the buttons. The only way to turn it off was to unplug it. It would then start up, with the Vizio logo going from orange to white, and then do the same thing all over, no pic or sound. I would check the ceramic fuse first on the board that gets power from the plug.

HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine.I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.

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