emerson LC391EM3 trouble

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  • ohren
    Upgrading a Samsung ue55nu7096u with logic board from an ue55ru7105k -- good idea?
    by ohren
    I hope this is the right forum to post in despite not technically being a repair, but still a question of swapping boards.

    I thought I'd explore the possibility to upgrade an existing working Samsung ue55nu7096u with the logic board (and power board if needed) of a newer model (ue55ru7105k) of the same size and appearance (and resolution). The reason being I'd like the extra inputs of that board including component in, an extra HDMI port and bluetooth. Its panel is broken so I have no use for the board otherwise.

    The models launched in 2018 and 2019 respectively....
    09-08-2023, 05:24 PM
  • Yanleb
    LG 60PK550 Logic Control Board EBR63450301
    by Yanleb
    Hi all, I just want to share the repair of my 60PK550-UA TV set.

    The TV set was powering on, just no image. After verification, nothing wrong on the YSus or ZSus boards. Nothing wrong on the main board either.

    But I noticed that the LED was not flashing on the Logic Control Board. This is an EBR63450301. The LED is supposed to flash even with all the flat cables disconnected, with only the power cable attached.

    All the voltages measured at the electrolytic capacitors on the board were good. From top left to bottom right:
    C57: 3.30V
    C61:...
    07-20-2023, 12:38 AM
  • karto95
    Repairing a Seagate hard drive with damaged logic board
    by karto95
    Hello everyone,

    I'm currently facing an issue with my Seagate hard drive that has a damaged logic board. I've obtained a replacement logic board from a donor hard drive, but unfortunately, I'm unable to recover the BIOS of the original board due to damaged firmware. I'm wondering if it's possible to make the hard drive work with this donor logic board.

    I have a CH341A programmer, so I'm hoping that it can be useful in this situation. I've attached the BIOS file .bin of the donor board for reference.

    If anyone has any suggestions or experience with this...
    03-21-2023, 04:05 AM
  • Crystaleyes
    Can an iMac chime if the logic board is bad?
    by Crystaleyes
    Hi all.

    A friend has a 2011 iMac which chimes (and apparently plays music) but was told by a technician that the logic board needs replacing.

    The screen stays black, but music apparently plays when the keyboard 'play' button is selected.
    A bit beyond my experience...??!!??

    I was under the impression that bad logic boards don't give the Apple chime.

    Anyway, they are bringing it over tomorrow where I'll check the diagnostic LED's to get a better idea. Seems more like a PSU, GPU or inverter problem to me.

    A bad...
    04-02-2022, 04:28 PM
  • grimacelord
    Need Help Identifying Component For Printer Main Logic Board HP M570DN
    by grimacelord
    Hello. I know that I am asking for help with a printer, but this is specific to the printer's logic board so I figured it would be best suited under the motherboard repair forum - please move if better suited somewhere else.

    I have an HP M570DN printer that has stopped being recognized by USB. This apparently happened after a lightning strike. I pulled the logic board out of the printer and did a visual inspection of the board under a microscope. Board looks ok. Then I started checking random caps looking for a shorted line somewhere. I eventually discover one. I inject 1V into...
    09-21-2021, 09:11 AM
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