Panasonic CF-20

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  • Maxpower3
    Bad Veteran
    • Feb 2018
    • 1165
    • France

    #1

    Panasonic CF-20

    Hello everyone,
    I'll come back with that. I started here but it wasn't the right place
    because it's not a bios or password problem

    https://www.badcaps.net/forum/troubl...87#post1866387

    Originally posted by Maxpower3
    blackscreen, no boot, no backlight after save and exit in bios setup.
    just led power on/off react

    I have tried several bios here, none have worked so far

    I think it's dead, even the USB key died at the same time as the computer.
    Just the lights power and beep when it turns off

    News:
    I noticed that the motherboard boots when the screen is unplugged.
    If I connect HDMI or LCD, the motherboard no longer triggers any reaction.
    On the other hand, if I unplug the screen and the HDMI, the keyboard responds with caps lock and activity on usb key.

    The backlight works if I force it. Pwm LED 0v and enable 3.3v LED.
    I don't think the screen has a problem


    I think I should look into display management around the PS8407A or CPU
    what do you think?

    Are there any diagrams?
    Thanks

    edit: PS8407A /1629B/ wg1219lm remplaced same
    if I connect after boot HDMI, it does not restart after a ctrl alt del
    Last edited by Maxpower3; 02-26-2024, 08:15 AM.
  • Maxpower3
    Bad Veteran
    • Feb 2018
    • 1165
    • France

    #2
    I had two cards that didn't work
    Click image for larger version

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    the first mentioned above and another that did nothing just consumption and no reaction.
    I exchanged several components to see the reactions?

    Now, both cards work,
    I noticed a lack of solder on 2 chips and I reflowed this area.
    Click image for larger version

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    the first time, I thought it was heating up the processor and I was lucky thanks to the reflow.
    but did not last.
    so I have reflow only it's 2 chips.
    Click image for larger version

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    The 1st card worked again (the one that did nothing)
    I then on the 2nd (starts only without screen).
    it also works again now!

    Is this a stroke of luck or will it hold?? to see over time



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