Question about Protron PLTV-26 26 in. HD-Ready LCD Television

3 Answers

I have the pltv26 and have sound but no picture. I read where this indicated a bad inverter board so I replaced the inverter board thinking one of the transformers were bad. I put the tv back together and I have sound but still no picture. Any other suggestions?

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  • r67183 Jan 31, 2010

    How do I check that the inverter board is getting power from the main board?

  • r67183 Feb 01, 2010

    How many volts should it read?

  • r67183 Feb 02, 2010

    Is the cable that carries power to the inverter board the multi pin braided cable or the single thin black wire that plugs into the end of the inverter board. if it is the multi pin, which colored wires carry the 18-20v power?

  • r67183 Feb 02, 2010

    do you know which colored wires in the multi-pin connector bring the power from the power box to the inverter board?

  • r67183 Feb 02, 2010

    which colored wires carry the power from the power board to the inverter board and is the 18-20 volts ac or dc?

  • r67183 Feb 03, 2010

    Can you tell me which colored wires should I check for the 24v coming from the power supply as there is a multi-in connector that plugs into the inverter board that contains about a dozen different colored wires? Should the voltmeter be set for AC or DC?

  • r67183 Feb 03, 2010

    The braided cable coming to the inverter board from the power supply board has about a dozen wires that go into a multi-pin nylon connector. Do you know which colored wires I should check with volt meter to see if the inverter is receiving the 24v from the power supply? Also, is is AC or DC voltage?

  • r67183 Feb 03, 2010

    can you tell me which colored wires carry the 24v to the inverter board from the power supply on the pltv26 protron LCD tv.monitor. There are about a dozen or so wires bundled into the nylon multi-pin connector that goes into the inverter board. and I want to see if it is receiving the 24vdc from the power supply to see why I have no picture but good sound.

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3 Answers

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The easiest way to check if the backlight inverter is working is to look for a dull glow on the screen. Turn on the tv and darken the room see if you notice a dull glow on the screen. If you do then the inverter is functional and what you have is most likely to be a faulty t-con board also known as video driver board or timing control board. Usually costs under 75$ for a tv of this size.

Sai.

Posted on Feb 03, 2010

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Hi,
That's the problem with LCD TVs, about 4 things can cause that problem. do you have a volt meter? If so you most inverters get 24v from the power supply. If you don't have 24v that would point to the power supply. If you do have it then the main board would the most likely suspect as there is a "back light detect" line if the main fails it may not see this signal. Otherwise the panel itself is bad and it would be cheaper just to buy another TV at that point.

Posted on Feb 02, 2010

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Hi,
Make sure inverter board is getting power from power supply board.
If above said is OK then main digital board would be defective as it controls picture and inverter board on-off function as well.
Thanks.

Posted on Jan 31, 2010

  • Shahid Electronics
    Shahid Electronics Jan 31, 2010

    How do I check that the inverter board is getting power from the main board?
    =========================================================

    Follow that connector of inverter board that goes to power supply board and check volts there with multimeter.



  • Shahid Electronics
    Shahid Electronics Feb 01, 2010

    How many volts should it read?
    =========================================

    Inverter board supply should be 18V to 20V


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6d4af5a.jpg

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