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Aspire 6530G - no backlight!

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    Aspire 6530G - no backlight!

    As the title says, I have a 6530G here (that has been recased by myself into a near-pristine 6930G casing) will power on just fine.

    The issue with it is that the backlight will not come on at all. Using a flashlight, I can see the laptop booting into Windows fine, and I do have external (HDMI) output.

    First off, a few specs:

    AMD Turion Ultra ZM-80 2.1GHz
    2GB DDR2 (667 I think)
    ATI Radeon Mobility HD4650 1GB - tested fine on another Acer (model 5520G, w/ MXM slot)
    Hitachi-LG GT30N

    Anyways, I have tested both the display and the inverter, and checked motherboard too.

    Results:

    -display works fine - tested on an Acer Aspire 5536G - backlight lights up.
    -tested inverter - I have the main 19V and ADJUST voltage, but no ENABLE voltage.
    -tested motherboard components responsible for the ENABLE signal - all tested up fine.
    -tested EACH inverter SMD component - all came up fine.

    Anything else I should try? I am at a loss at what else to try.

    Again, the GPU is working fine and so is the LCD itself (Samsung LTN160AT01), and the inverter seems to do its job (as I have read 19v straight from the pin on the inverter PCB) but I don't have any slight hint of the ENABLE signal on the inverter.

    Other useful data:

    MB model: Quanta ZK3 Rev:E
    Inverter model: Sumida IV10117T/C4-E-LF
    Last edited by Dan81; 01-24-2020, 05:52 AM.
    Main rig:
    Gigabyte B75M-D3H
    Core i5-3470 3.60GHz
    Gigabyte Geforce GTX650 1GB GDDR5
    16GB DDR3-1600
    Samsung SH-224AB DVD-RW
    FSP Bluestorm II 500W (recapped)
    120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
    Delux MG760 case

    #2
    Re: Aspire 6530G - no backlight!

    If CN3 is your LVDS Connector check pin 10 1 5 2 voltage
    Last edited by Techtiger; 01-24-2020, 07:12 AM.

    Comment


      #3
      Re: Aspire 6530G - no backlight!

      Originally posted by techtiger View Post
      If CN3 is your LVDS Connector check pin 10 1 5 2 voltage
      Yes, CN3 is LVDS.

      Pin 1: 10V
      Pin 2: 0V
      Pin 5: 3.3V
      Pin10: 1.16V
      Main rig:
      Gigabyte B75M-D3H
      Core i5-3470 3.60GHz
      Gigabyte Geforce GTX650 1GB GDDR5
      16GB DDR3-1600
      Samsung SH-224AB DVD-RW
      FSP Bluestorm II 500W (recapped)
      120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
      Delux MG760 case

      Comment


        #4
        Re: Aspire 6530G - no backlight!

        Originally posted by Dan81 View Post
        Yes, CN3 is LVDS.

        Pin 1: 10V
        Pin 2: 0V
        Pin 5: 3.3V
        Pin10: 1.16V
        Now check U4 IC all pins expect 2/5 with power and with out power with the help of the multimeter resistance to ground all pins expect 2/5

        Comment


          #5
          Re: Aspire 6530G - no backlight!

          Originally posted by techtiger View Post
          Now check U4 IC all pins expect 2/5 with power and with out power with the help of the multimeter resistance to ground all pins expect 2/5
          Okay, here are the readings, meter set to 2k for 1 and 3, meter set to to 200ohms for 6 and 4.

          No power:

          Pin1: 1.490kOhm
          Pin3: 1.274kOhm
          Pin6: 5Ohm
          Pin4: 5Ohm

          With power applied I get infinite on all pins, and that's with the meter set and tested on each setting - 2k,20k,200k and even 2M.

          I used one of the screws for the left hinge as GND reference.
          Last edited by Dan81; 01-24-2020, 12:56 PM.
          Main rig:
          Gigabyte B75M-D3H
          Core i5-3470 3.60GHz
          Gigabyte Geforce GTX650 1GB GDDR5
          16GB DDR3-1600
          Samsung SH-224AB DVD-RW
          FSP Bluestorm II 500W (recapped)
          120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
          Delux MG760 case

          Comment


            #6
            Re: Aspire 6530G - no backlight!

            Originally posted by Dan81 View Post
            Okay, here are the readings, meter set to 2k for 1 and 3, meter set to to 200ohms for 6 and 4.

            No power:

            Pin1: 1.490kOhm
            Pin3: 1.274kOhm
            Pin6: 5Ohm
            Pin4: 5Ohm

            With power applied I get infinite on all pins, and that's with the meter set and tested on each setting - 2k,20k,200k and even 2M.

            I used one of the screws for the left hinge as GND reference.
            Put the meter to 20V and test again Voltage on all pins of U4

            Comment


              #7
              Re: Aspire 6530G - no backlight!

              Originally posted by techtiger View Post
              Put the meter to 20V and test again Voltage on all pins of U4
              U4

              Pin1:3.21V
              Pin3:3.19V
              Pin6:3.26V
              Pin4:3.28V
              Main rig:
              Gigabyte B75M-D3H
              Core i5-3470 3.60GHz
              Gigabyte Geforce GTX650 1GB GDDR5
              16GB DDR3-1600
              Samsung SH-224AB DVD-RW
              FSP Bluestorm II 500W (recapped)
              120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
              Delux MG760 case

              Comment


                #8
                Re: Aspire 6530G - no backlight!

                Pin 1 is have 3V but the CN3 pin 2 0V check the resistor R22 both sides for Voltage, The screen must be connected to the motherboard when you test

                Comment


                  #9
                  Re: Aspire 6530G - no backlight!

                  Originally posted by techtiger View Post
                  Pin 1 is have 3V but the CN3 pin 2 0V check the resistor R22 both sides for Voltage, The screen must be connected to the motherboard when you test
                  3.20V on both sides.
                  Main rig:
                  Gigabyte B75M-D3H
                  Core i5-3470 3.60GHz
                  Gigabyte Geforce GTX650 1GB GDDR5
                  16GB DDR3-1600
                  Samsung SH-224AB DVD-RW
                  FSP Bluestorm II 500W (recapped)
                  120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                  Delux MG760 case

                  Comment


                    #10
                    Re: Aspire 6530G - no backlight!

                    In Post#3 you have written 0V on pin 2 CN3! So now you have Voltage on pin 2 of CN3

                    Comment


                      #11
                      Re: Aspire 6530G - no backlight!

                      Yeah, I now figured out why I had 0V first time and have 3.2V. The first time I tried to measure pin2 I had to remove the LVDS cable to have access to it. Dumb move from my part.

                      However, how do I check pin10 now? I successfully found out I have 9V on CN3 pins 1 and 3 (these are the main power to the inverter), 3.20V on pin 2.

                      L.E: I managed to measure pin10 through the pads of unpopulated R175. 1.68V measured.
                      Last edited by Dan81; 01-25-2020, 05:57 AM.
                      Main rig:
                      Gigabyte B75M-D3H
                      Core i5-3470 3.60GHz
                      Gigabyte Geforce GTX650 1GB GDDR5
                      16GB DDR3-1600
                      Samsung SH-224AB DVD-RW
                      FSP Bluestorm II 500W (recapped)
                      120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                      Delux MG760 case

                      Comment


                        #12
                        Re: Aspire 6530G - no backlight!

                        Now test Pin 15 BL_ON and Pin5 +3V
                        Last edited by Techtiger; 01-25-2020, 11:25 AM.

                        Comment


                          #13
                          Re: Aspire 6530G - no backlight!

                          Originally posted by Dan81 View Post
                          Yeah, I now figured out why I had 0V first time and have 3.2V. The first time I tried to measure pin2 I had to remove the LVDS cable to have access to it. Dumb move from my part.

                          However, how do I check pin10 now? I successfully found out I have 9V on CN3 pins 1 and 3 (these are the main power to the inverter), 3.20V on pin 2.

                          L.E: I managed to measure pin10 through the pads of unpopulated R175. 1.68V measured.
                          Now test Pin 15 BL_ON and Pin5 +3V, For the Main power 10V is for Battery not for the adapter (+19V) leave it for the moment

                          Comment


                            #14
                            Re: Aspire 6530G - no backlight!

                            Originally posted by techtiger View Post
                            Now test Pin 15 BL_ON and Pin5 +3V
                            Pin5: 3.3V
                            Pin 15: 0.54V
                            Main rig:
                            Gigabyte B75M-D3H
                            Core i5-3470 3.60GHz
                            Gigabyte Geforce GTX650 1GB GDDR5
                            16GB DDR3-1600
                            Samsung SH-224AB DVD-RW
                            FSP Bluestorm II 500W (recapped)
                            120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                            Delux MG760 case

                            Comment


                              #15
                              Re: Aspire 6530G - no backlight!

                              Originally posted by Dan81 View Post
                              Pin5: 3.3V
                              Pin 15: 0.54V
                              This is your Backlight Control circuit check all voltage , pin 15 Voltage should be 3V-3.3V
                              Attached Files
                              Last edited by Techtiger; 01-25-2020, 12:25 PM.

                              Comment


                                #16
                                Re: Aspire 6530G - no backlight!

                                Originally posted by techtiger View Post
                                This is your Backlight Control circuit check all voltage , pin 15 Voltage should be 3V-3.3V
                                R36: 3.24V
                                R37: 3.24V (both sides)
                                R35: 3.24V only on one side
                                R32: 3.27V only on one side
                                R34: 3.27V on one side, 0.53V on the other
                                Q8: no voltage on any pins
                                Q7: 3.22V on gate
                                Q5: 3.27V on Drain and Source
                                Q4: 0.51V on Drain, nothing on the others
                                D2: 0.51V on one side, 0V on the other
                                Pin 15 still sits at 0.51V.
                                Main rig:
                                Gigabyte B75M-D3H
                                Core i5-3470 3.60GHz
                                Gigabyte Geforce GTX650 1GB GDDR5
                                16GB DDR3-1600
                                Samsung SH-224AB DVD-RW
                                FSP Bluestorm II 500W (recapped)
                                120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                                Delux MG760 case

                                Comment


                                  #17
                                  Re: Aspire 6530G - no backlight!

                                  A photo with the voltages.

                                  At this point I am deciding whether to get another motherboard (a ZK2 this time, at least to put one of my T9400s to a good use) or just rig up a bunch of slim 5v LED strips behind the LCD.
                                  Attached Files
                                  Main rig:
                                  Gigabyte B75M-D3H
                                  Core i5-3470 3.60GHz
                                  Gigabyte Geforce GTX650 1GB GDDR5
                                  16GB DDR3-1600
                                  Samsung SH-224AB DVD-RW
                                  FSP Bluestorm II 500W (recapped)
                                  120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                                  Delux MG760 case

                                  Comment


                                    #18
                                    Re: Aspire 6530G - no backlight!

                                    Originally posted by Dan81 View Post
                                    A photo with the voltages.

                                    At this point I am deciding whether to get another motherboard (a ZK2 this time, at least to put one of my T9400s to a good use) or just rig up a bunch of slim 5v LED strips behind the LCD.
                                    Any Other member could help why BL_ON 0.53V?

                                    Comment


                                      #19
                                      Re: Aspire 6530G - no backlight!

                                      no without detailed resistance measuring. i would check that LID signal

                                      post full schematic

                                      please wrote your reading for every pin of that mosfets in red color to picture.

                                      u must have BL# grounded by Q7/gate is high/ so it not grounded by next mosfet/gate is low/ BL_ON signal.
                                      Last edited by ktmmotocross; 01-28-2020, 11:16 AM.

                                      Comment


                                        #20
                                        Re: Aspire 6530G - no backlight!

                                        Originally posted by ktmmotocross View Post
                                        no without detailed resistance measuring. i would check that LID signal

                                        post full schematic

                                        please wrote your reading for every pin of that mosfets in red color to picture.

                                        u must have BL# grounded by Q7/gate is high/ so it not grounded by next mosfet/gate is low/ BL_ON signal.
                                        So if Q7 gate is grounded this enables the BL_ON signal?
                                        Main rig:
                                        Gigabyte B75M-D3H
                                        Core i5-3470 3.60GHz
                                        Gigabyte Geforce GTX650 1GB GDDR5
                                        16GB DDR3-1600
                                        Samsung SH-224AB DVD-RW
                                        FSP Bluestorm II 500W (recapped)
                                        120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                                        Delux MG760 case

                                        Comment

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