Question: Laptop asus X553MA REV 2.0 has LVDS CONTROLLER DEAD ANX1121?

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  • valente222
    Senior Member
    • Feb 2021
    • 85
    • PERU
    #1

    Question: Laptop asus X553MA REV 2.0 has LVDS CONTROLLER DEAD ANX1121?

    Good afternoon, time without writing here. I also see the change of website colors. nice.

    -The Mess:
    I've been reviewing this laptop for a few days. The computer turns on, but does not give an image on the screen. Possible failure in LVDS controller.
    measurement:
    chip ANX1121

    BL_EN: 0V
    Buf_PLT_RESET#: 3.25V
    XLT_DION: 0V
    XLT_BLEN: 0V
    3v_LCD:0v
    LED_VCC_INV: 18.9V
    LCD_BACKOFF#: 3.23V
    AVDD12: 1.2v
    AVDD33: 3.24v

    Remark: 1.Measurement were taken with connected screen. 2.The built-in U4501 switch is disabled on the power supply. (related to bl_en) 3. Bios recently flashed for a new one. If anyone has another BIOS it would be great to try. Thank you.

    [MOD EDIT] Link to boardview - https://www.badcaps.net/forum/troubl...-2-0-boardview

    2 Photos
    Tags: None
    • valente222
      Senior Member
      • Feb 2021
      • 85
      • PERU
      #2
      Another suggested measurement is, EDP_VDD_EN but this remains at zero volts. Does anyone know why it is null?
      also BL_EN: 0.33v very low for this line.
      quarz oscillators in good condition.
      Basic low consumption processor, N2830 Intel.
      S0 state: 176mA no video S5 state: 7mAmedicion 122

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india
          #3
          Are you sure MB is posting? verify by plugging a USB keyboard and toggling numlock key. Is there display on external monitor?

            Comment

            • valente222
              Senior Member
              • Feb 2021
              • 85
              • PERU
              #4
              Originally posted by mcplslg123
              Are you sure MB is posting? verify by plugging a USB keyboard and toggling numlock key. Is there display on external monitor?
              no imagen external

                Comment

                • mcplslg123
                  Badcaps Legend
                  • Jun 2015
                  • 7262
                  • india
                  #5
                  So ,is it posting? You checked numlock key on usb keyboard?
                  If its not posting,its useless troubleshooting edp pins.

                    Comment

                    • valente222
                      Senior Member
                      • Feb 2021
                      • 85
                      • PERU
                      #6
                      Originally posted by mcplslg123
                      So ,is it posting? You checked numlock key on usb keyboard?
                      If its not posting,its useless troubleshooting edp pins.
                      Sorry sir, incomplete message from me. If you tested it on the locknum keyboard, it works fine.

                        Comment

                        • mcplslg123
                          Badcaps Legend
                          • Jun 2015
                          • 7262
                          • india
                          #7
                          ok,so its posting. Replace the AXN1121 lvds regulator.

                            Comment

                            • valente222
                              Senior Member
                              • Feb 2021
                              • 85
                              • PERU
                              #8
                              Originally posted by mcplslg123
                              ok,so its posting. Replace the AXN1121 lvds regulator.
                              Ok sir, thank you for your opinion, the IC is changed. The equipment works 100%. I am left with doubt.
                              Why does the IC open burnt? Over screen tension? I will have to analyze power capacitor pulses. In cases of EDP signal does not exist, is the PCH correct?​

                                Comment

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