z50-70 nm-a273 no display

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  • ous154
    Member
    • Aug 2015
    • 29
    • turkey

    #1

    z50-70 nm-a273 no display

    hi guys i have lenovo z50-70
    mb.nm-a273
    no display en lcd but working on vga i tried everything
    if any one have any idea plz help
  • KillerFlash
    New Member
    • Apr 2018
    • 8
    • Phillippines

    #2
    Re: z50-70 nm-a273 no display

    Sir, try to check your LCD cable to motherboard if their is faulty wiring and kindly double check your lcd panel if their is display but no back-light, how ever try to use other spare of lcd panel to make sure that the motherboard is working via LCD.

    Comment

    • ous154
      Member
      • Aug 2015
      • 29
      • turkey

      #3
      Re: z50-70 nm-a273 no display

      Thanks for reply but I tried another lcd and cable it's the same

      Comment

      • Ahmed ashour
        Member
        • Mar 2016
        • 12
        • Egypt

        #4
        Re: z50-70 nm-a273 no display

        I have the same issue
        - tried BIOS
        - another LCD and LCD cable but still gives no display
        Any help plz
        Thanks in advance

        Comment

        • SMDFlea
          Super Moderator
          • Jan 2018
          • 20709
          • UK

          #5
          Re: z50-70 nm-a273 no display

          Check the LCD POWER circuit in the schematic
          Attached Files
          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

          Comment

          • Ahmed ashour
            Member
            • Mar 2016
            • 12
            • Egypt

            #6
            Re: z50-70 nm-a273 no display

            thanks buddy, I'll check it then give you fee back later

            Comment

            • Ahmed ashour
              Member
              • Mar 2016
              • 12
              • Egypt

              #7
              Re: z50-70 nm-a273 no display

              Originally posted by SMDFlea
              Check the LCD POWER circuit in the schematic
              I couln't fix it unfortunately, so if there is any suggestion i'd be pleasured
              and frankly i couldn't understand the LCD POWER circuit properly

              Comment

              • mielta
                Badcaps Veteran
                • Apr 2015
                • 368
                • Germany

                #8
                Re: z50-70 nm-a273 no display

                Hi
                First messure voltage at JEDP1 Pin 1,14,16,20,21,23,30 an write it here

                Pin1- ...V
                Pin14-...V

                Comment

                • Ahmed ashour
                  Member
                  • Mar 2016
                  • 12
                  • Egypt

                  #9
                  Re: z50-70 nm-a273 no display

                  Originally posted by mielta
                  Hi
                  First messure voltage at JEDP1 Pin 1,14,16,20,21,23,30 an write it here

                  Pin1- ...V
                  Pin14-...V
                  Thank you in advance for your concern buddy
                  as you requested
                  Pin 1 = 19.8 V
                  pin 14 = 0 V
                  pin 16 = 0 V
                  Pin 20 = 0 V
                  Pin 21 = 3.3 V
                  Pin 23 = 3.3 V
                  Pin 30 = 3.3 V

                  Comment

                  • mielta
                    Badcaps Veteran
                    • Apr 2015
                    • 368
                    • Germany

                    #10
                    Re: z50-70 nm-a273 no display

                    Pin20 goes to +3vs the same witch goes to pin23 but on pin 20 there is an resistor R21
                    please check him

                    Comment

                    • Ahmed ashour
                      Member
                      • Mar 2016
                      • 12
                      • Egypt

                      #11
                      Re: z50-70 nm-a273 no display

                      They don't name the resistors on Motherboard, that's why i couldn't find R21, Is there any way to find it

                      Comment

                      • mielta
                        Badcaps Veteran
                        • Apr 2015
                        • 368
                        • Germany

                        #12
                        Re: z50-70 nm-a273 no display

                        follow the line from pin20 with an multimeter on Ohm

                        Comment

                        • Stevie2001
                          Senior Member
                          • Apr 2018
                          • 183
                          • irland

                          #13
                          Re: z50-70 nm-a273 no display

                          Try get boardview if u cant find free buy it

                          Comment

                          • technician37
                            Member
                            • Aug 2018
                            • 30
                            • philippines

                            #14
                            Re: z50-70 nm-a273 no display

                            i almost same problem..

                            sir how if pin 21 is 0v?
                            gpu heat up but processor is not.
                            bios have 3.3v same with power switch

                            it is possible reflash BIOS?

                            thanks in advance..

                            Comment

                            • caspian
                              Badcaps Legend
                              • Oct 2015
                              • 1589
                              • Laptop

                              #15
                              Re: z50-70 nm-a273 no display

                              If it has display on a VGA monitor and the GPU heats up too much while a heatsink is on the GPU, that means the GPU may be defective. So it is not a Bios issue. However, more tests are required to make sure the GPU is defective.

                              Comment

                              • on/off
                                Badcaps Veteran
                                • Oct 2016
                                • 333
                                • Indonesia

                                #16
                                Re: z50-70 nm-a273 no display

                                Originally posted by technician37
                                sir how if pin 21 is 0v?
                                First make sure your problem NOT on LVDS cable or LED panel.
                                Connect your mobo with external monitor and display have working with it.

                                Pin 21 of LVDS conn doesn't appear:
                                DMC_DATA and DMC_CLK doesn't get signal 3.3V
                                LVDS not connect
                                Signal PCH_ENVDD not going HIGH.

                                Test and measure with LVDS cable connected without adapter or battery:
                                On LVDS conn Pin 21 not low resistance.

                                Test and measure with adapter or battery ( adapter preferred)
                                Check signal DMC_DATA and DMC CLK have correct signal. then
                                Check PCH_ENVDD signal.

                                Originally posted by technician37
                                it is possible reflash BIOS?
                                I think not Bios issue.

                                Comment

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