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JVC LT50CF890 Stuck in Boot Loop: Firmware Update or Mainboard Replacement?

jacox1234 1095 6
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  • #1 21354339
    jacox1234
    Level 2  
    Hello,

    I have a JVC lt50cf890 which is currently stuck in a loop trying to load, I've attempted the factory reset etc but no joy. Apparently this was caused by an update.

    It uses a 17MB170 mainboard.

    Any options to either update the firmware via the bootloader? I'm struggling to find the files, JVC have nothing. Amazon, useless.

    Or can I replace the board with a working one?

    Thanks in advance.
    AI: Can you describe the specific behavior or error messages you see when the TV is stuck in the boot loop?
    Loads to FireTV logo, and resets.
    AI: Have you attempted any other troubleshooting steps or firmware updates besides the factory reset? If so, what were they?
    Do not have any firmware files to try
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  • #3 21355715
    jacox1234
    Level 2  
    I've replaced the board with a working 17MB170 board, but now it's stuck in a boot loop and the screen is duplicated. Attached pic.

    The donor TV, a JVC LT-50CF890(B) - and the TV I need to repair LT-50CF890(A)

    So I'm assuming the firmware is incorrect? I'm guessing I don't need to change the power board as well??

    Any help appreciated.

    JVC TV with dual logos on the screen. Label of JVC LT-50CF890(A) TV with technical information. JVC LT-50CF890(B) TV label with model and power information.
  • #4 21355829
    querij
    Level 20  
    Good morning, did you try to order the software from the brand?
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  • #5 21355833
    lisek
    Service technician RTV  
    For the replacement of Vestel plates > the so-called BARcode (8-digit) is important.
    - used to be a sticker, now QR code
    - tells you the matrix type and software

    Not the description of 17MB170
    - is a description of the chassis, pcb (bare board) which changes its "purpose" after adding RC, circuits and jumpers ..and FW (firmware)

    Power supplies for models, under matrixes (their lighting) are described similarly

    Probably in both models different matrices
    - please write which one in (A) and which one in (B)
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  • #6 21355850
    Lomax33
    Level 16  
    Do you have a picture of the motherboard ? If you can, take a detailed picture of the processor side
  • #7 21355853
    lisek
    Service technician RTV  
    This is the same subject Link
    - you can see the barcode on the power supply and main boards

    Or look at the board descriptions / different matrixes Link_ LT-50CF890 main

    JVC LT-50CF890 50" TV 17MB170 (23708791) SCREEN: CV500U2-T01
    JVC LT-50CF890(C) , TV 17MB170 (23741628) Screen: VES500QNDP-2D-N43
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Topic summary

The discussion revolves around a JVC LT50CF890 television that is stuck in a boot loop after a software update. The user attempted a factory reset without success and is seeking solutions, including firmware updates via bootloader or replacing the mainboard. The mainboard in question is a 17MB170. After replacing the board with a working one, the user encountered a new issue where the screen is duplicated, suggesting a potential firmware mismatch. Participants in the discussion suggest checking for the correct firmware and emphasize the importance of the BARcode on the mainboard for compatibility. They also inquire about the specific matrix types of the donor and target TVs.
Summary generated by the language model.
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