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Panasonic TH-55FS435Q - backlit black screen, green/red LED boot loop, firmware needed

AlfaWolf 288 1
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  • Need chassis or main board number for firmware lookup

    #1 21926853
    AlfaWolf
    Level 1  
    Posts: 1
    Evening to All. I received a Panasonic TH-55FS435Q LED TV that has a black screen, though the screen is lit. It's blank, and the power light glows green for a couple of seconds and turns red, then green, and repeats the cycle. It seems to be stuck in a boot loop, and I have repeated the reset cycle, but no luck, and I can't find the firmware file, and need help, please.
    Panasonic TV specification label on the back panel, showing model TH-55FS435G and barcodes

    Hand holds black tape by a silver device housing with labels “LVF550CSDX E0017” and a barcode

    Close-up of a green PCB with a black heatsink, wire connectors, and label TD.NT72563.787



    Please can you confirm exactly what reset procedure you tried, and does the TV ever show a Panasonic logo, menu, sound, or response to the remote before it restarts?
    There is no remote, no logo, no sound, the buttons don't even respond, nothing, just a backlit black screen, and the indication light goes from green to red but at a relaxed pace.
    Can you post the chassis/main board number or a clear photo of the sticker on the main board/back cover, as the firmware may depend on that and not only on model TH-55FS435Q?
    I've attached all the codes required and attached a video of the issue I'm having
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  • #2 21933826
    lisek
    Service technician RTV
    Posts: 39934
    Help: 6340
    Rate: 6862
    This is an unusual model for Panasonic
    - Panasonic TH-55FS430M / TH-55FS435Q chassis NT72

    Service Manual available for download ( TCL NT72563 Service Manual ) Link
    - the repair diagram starts on page 26

    P.S.
    Google the phrase: NT72563 – you’ll find plenty of helpful information
    Attachments:
    • Panasonic TH-55FS430M_ NT72 PMMAF190603CE.pdf (2.72 MB) You must be logged in to download this attachment.
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