logic board 820-2879

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • naitek
    New Member
    • Feb 2016
    • 3
    • Bahamas
    #1

    logic board 820-2879

    hello all,
    have following issue;
    u7500 shorted and was replaced as well as current limit resistors near
    u7000.

    board was having voltage fluctuations
    12.5 v - 0.3 volts and back up again.

    now, the fan starts , but no chime , no backlight.

    have ppvcore and mcp core as well as Frequency @ y2810

    any help would be great where to check next .thanks
    Tags: None
    • pateldee@live.co.uk
      New Member
      • Jul 2014
      • 3
      • UK
      #2
      Re: logic board 820-2879

      MCP89 dead

        Comment

        • Pedro147
          Senior Member
          • Sep 2016
          • 157
          • Australia
          #3
          Re: logic board 820-2879

          Check resistance to GND of PP3V42_G3H. Anything less than 20 -30K ohms is generally dead MCP > one way trip to the bin sorry
          My YouTube channel - https://www.youtube.com/channel/UCiD...5d6OgizDqoi_SA

            Comment

            Previous template Next

            Related Topics

            Collapse
            • Tynan Dill
              Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
              by Tynan Dill
              I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

              Upon bringing it home and plugging it up, it showed a standby light.

              I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

              The screen seems to blackout and stay black, but with a flashlight I can see the display.

              With my Playstation 4 connected via HDMI, and running a game I can hear sound.

              Assuming...
              ORIGINAL POWER SUPPLY BOARD
              7 Photos
              11-22-2024, 01:46 PM
            • m1ch43lzm
              HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
              by m1ch43lzm
              Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
              Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
              05-12-2025, 08:37 PM
            • 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
            • 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
            • Loading...
            • No more items.
            Working...