Philips 75pfl5704/F7 No sndby power

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  • CurtisC
    Member
    • Mar 2023
    • 16
    • US
    #21
    Re: Philips 75pfl5704/F7 No sndby power

    UPDATE
    Okay I replaced the Main Board with a new one.
    I am now getting 3.3V going into the power Board around 19V going out instead of the previous 0V and 12V.

    I am not however getting any voltages at the Backlights power connector on the Power Board (Image). I also do not see any image on the screen when holding a light to it. It's possible that my flashlight could be too weak tho.

    Any ideas? I will be scouring the interwebs for ideas...

    PS. I need to also post that the tech manual in the first post is NOT the correct one for this TV, but it does show the correct power board model. I can not find a manual for my model TV (75pfl5604f7) sorry for the confusion. I would edit the name of this thread but I am not able to. Thanks
    Attached Files
    Last edited by CurtisC; 04-30-2023, 12:41 AM.

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      • CurtisC
        Member
        • Mar 2023
        • 16
        • US
        #22
        Re: Philips 75pfl5704/F7 No sndby power

        The cable between the power Board and the main board is reading normal voltages at most of the pins. I cannot get Protect3 or either backlight which from what I understand are all a part of the backlight system.

        Also the power on P-on-20v never goes back to the 12v when the TV should be in standby mode. As soon as the TV is plugged in the power on all working pins flows.

        Anyone work on Philips TVs that may have a idea on a next srep?
        Attached Files

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          • CurtisC
            Member
            • Mar 2023
            • 16
            • US
            #23
            Re: Philips 75pfl5704/F7 No sndby power

            So after researching a bit it seems Protect3 corresponds to the backlight and a possible LED failure.
            I bought a LED tester but I'm running into another problem.
            How do I test these LEDs?

            Unlike most videos and posts on the subject the wires running from power supply to the strips are labled ILED 1-4 and VLED 1-4. When I test in pairs or using cold ground I get no response from the tester as if its an open circuit.

            These Philps and Emerson boards are irritating.

            Thanks for your help!
            Attached Files

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              • CurtisC
                Member
                • Mar 2023
                • 16
                • US
                #24
                Re: Philips 75pfl5704/F7 No sndby power

                Never mind I was able to test. Each of the 4 power lines tested at 54.4V with the tester and lights can be seen through the back of the TV.

                Still no power at Protect3 so does anyone know what I should check next? Thanks

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