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
  • korben_dallas
    Will I have a bricked logic board after reflow of the GPU v-core U8900 chip on my Mid-2012 15" Retina Macbook pro?
    by korben_dallas
    Hi everyone! I'm trying to fix my black screen / failed U8900 GPU v-core on my Mid-2012 Macbook Pro 15" Retinaby doing a rework/reflow of the chip (once I determine that's the real issue; but it likely is).

    I've been disabling the GPU in NVRAM for a few years... but it's just time for a better solution.

    I'm new to soldering but the only feasible way to fix this issue is to do something myself.

    MY QUESTION:
    I've been seeing some people (on this forum mostly) run into issues with the logic board needing a serial number or it being deactivated (?)...
    02-14-2024, 12:23 AM
  • 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
  • mferna14
    Logic Board 820-00840-A Missing EDP_BKLT_EN
    by mferna14
    Hi dear friends., I am working on a Apple MacBook Pro A1708 , Logic Board 820-00840-A that has no backlight. The logic board powers on fine, but no display. After Checking on the backlight driver chip, I found that the EDP_BKL_EN is missing. And this Power Enable comes from the PCH. So does this means this Logic board cannot be repaired & brought back to life again? The resistance from GRD to the test point of EDP_BKL_EN is around is 0.66M ohms. R8442 (0ohms) is ok. Any suggestion/Tip if any would really appreciate. ​
    07-10-2024, 05:18 PM
  • mferna14
    Apple 820-01958-A logic board stuck on 5V .19amp
    by mferna14
    Hi friends, working on a MacBook Air A2179 logic board 820-01958-A logic board. It's just stuck on 5V .19amp on one USB-port & then when I use to the other port it's also stuck on 5V .19amp but on this port it resets after few secs & start over with the same said voltage. I assumed that one of the CD3217B12s is defective, & replaced both with known good ICs. The status & result remains the same. I checked for shorts or liquid spill, all clear. On F8400 there is 12v present, but no 5V or 3.3 volts. There are LDO voltages on the both CDs 3.2v & 1.5V. Kindly if someone can help...
    02-21-2025, 03:42 PM
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