A1706 Touch Bar No LCD power (not flexgate)

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Stephen
    Meow Meow MEOW!
    • Apr 2020
    • 667
    • United States

    #1

    A1706 Touch Bar No LCD power (not flexgate)

    Pretty simple. I have no power on EDP_PANEL_PWR_EN

    Replaced with new chips and board now finally turns on (u8510) LCD is known working so it is not the LCD. Replaced the LVDS as well and its known good. There is no voltage at R8590 and R8591 (NO STUFF RESISTOR)
    I am certain this is the cause, because this area had power before and now it does not. LCD PIN 43 on LVDS PPVOUT LCDBKL has power (12 Volts)

    Hooked up to HDMI and displays on HDMI. Board powers on etc. Did test multiple LCD that are cracked but have good backlights to no avail. Any suggestions?
    sigpic
    MEOWING IN THE IMPOSSIBLE UNIVERSE!
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13830
    • Canada

    #2
    Re: A1706 Touch Bar No LCD power (not flexgate)

    See comments here from @Piernov:

    https://www.badcaps.net/forum/showthread.php?t=84035

    Comment

    • Stephen
      Meow Meow MEOW!
      • Apr 2020
      • 667
      • United States

      #3
      Re: A1706 Touch Bar No LCD power (not flexgate)

      After further testing U8501 and U8500 have no power in certain points when removed. I see this is the LCD PWR area but I am still lost. Maybe bad DIODES?
      sigpic
      MEOWING IN THE IMPOSSIBLE UNIVERSE!

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 13830
        • Canada

        #4
        Re: A1706 Touch Bar No LCD power (not flexgate)

        Can you post your logic board # ?

        Comment

        • Stephen
          Meow Meow MEOW!
          • Apr 2020
          • 667
          • United States

          #5
          Re: A1706 Touch Bar No LCD power (not flexgate)

          A1706 820-00239
          sigpic
          MEOWING IN THE IMPOSSIBLE UNIVERSE!

          Comment

          • mon2
            Badcaps Legend
            • Dec 2019
            • 13830
            • Canada

            #6
            Re: A1706 Touch Bar No LCD power (not flexgate)

            Voltage readings for the following ?

            1) PP5V_S0

            2) LCD_PWR_SLEW

            3) PP5V_S0SW_LCD

            4) PANEL_P3V3_EN

            5) LCD_PWR_SLEW_3V3

            6) PP3V3_S0SW_LCD_R

            7) PP3V3_S5

            8) EDP_PANEL_PWR_EN and also BUF_EDP_PANEL_PWR_EN

            9) PP3V3_S0SW_LCD

            Above are all from sheet 80/119.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13830
              • Canada

              #7
              Re: A1706 Touch Bar No LCD power (not flexgate)

              Also, post the voltage reading for:

              PPVCC_S0_CPU


              Is it stable or does it fluctuate ?

              Comment

              • Stephen
                Meow Meow MEOW!
                • Apr 2020
                • 667
                • United States

                #8
                Re: A1706 Touch Bar No LCD power (not flexgate)

                Will get back to you about this later tomorrow!
                sigpic
                MEOWING IN THE IMPOSSIBLE UNIVERSE!

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13830
                  • Canada

                  #9
                  Re: A1706 Touch Bar No LCD power (not flexgate)

                  Stephen, did you ever post the above requested value? It was to repair another logic board.

                  Comment

                  • Stephen
                    Meow Meow MEOW!
                    • Apr 2020
                    • 667
                    • United States

                    #10
                    Re: A1706 Touch Bar No LCD power (not flexgate)

                    I did not lol. I actually repaired that board. It was a bad diode. I have another post with a different board VERY odd with the LCD turning on and only being black with the back light on. You got any suggestions?
                    sigpic
                    MEOWING IN THE IMPOSSIBLE UNIVERSE!

                    Comment

                    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...
                      11-22-2024, 01:46 PM
                    • PantherDave
                      Microsoft Surface Pro (5th gen) model 1796 - no power
                      by PantherDave
                      Hi all!

                      I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅

                      I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
                      https://www.badcaps.net/forum/troubl...-hardware-devi...
                      05-29-2024, 02:01 PM
                    • GLISIT
                      Asus Probook P5440UF-XB74 power issue
                      by GLISIT
                      Hi all,

                      TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!


                      I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!

                      A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about...
                      01-16-2025, 02:29 PM
                    • sam_sam_sam
                      Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
                      by sam_sam_sam
                      I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

                      One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
                      03-31-2024, 02:12 PM
                    • Document Archive
                      HP Pavilion Power Pavilion Power 15-cb009nl Notebook 15 Specification for Upgrade or Repair
                      by Document Archive
                      This specification for the HP Pavilion Power Pavilion Power 15-cb009nl Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 15-cb009nl boardview and Pavilion Power 15-cb009nl schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that...
                      09-06-2024, 05:59 AM
                    • Loading...
                    • No more items.
                    Working...