Neovo F-419 no power.

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  • playman
    Badcaps Veteran
    • Jan 2011
    • 252

    #1

    Neovo F-419 no power.

    I get no power on the lcd, not even on the power led.

    scematics of the PCB.


    D801 was missing when I opened it, I replaced it with RGP10D instead.
    D802 is PS104R D0-41 PANJIT wich seems identical to PS1010R DO-51 PANJIT wich I belive should be in D801.

    Any ideas what might be wrong?
    Attached Files
  • jetadm123
    Badcaps Legend
    • Feb 2010
    • 2169

    #2
    Re: Neovo F-419 no power.

    Nice photos! Try checking the main fuse, F801, 3.15A for continuity. If it checks good, then check the voltage across the main cap (large green one upper right). If you are in the USA, it should measure approx. 165VDC.

    Comment

    • playman
      Badcaps Veteran
      • Jan 2011
      • 252

      #3
      Re: Neovo F-419 no power.

      Originally posted by jetadm123
      Nice photos!
      Thanks it took me a while though, to get them that good lol
      Try checking the main fuse, F801, 3.15A for continuity. If it checks good, then check the voltage across the main cap (large green one upper right). If you are in the USA, it should measure approx. 165VDC.
      I'm in Iceland, using 230v system.
      The fuse was the first thing I checked
      how should I check the Cap? plug the monitor in and test it or? sorry i'm still a newbie
      btw I have no ESR tester.

      Comment

      • PlainBill
        Badcaps Legend
        • Feb 2009
        • 7034
        • USA

        #4
        Re: Neovo F-419 no power.

        Originally posted by playman
        Thanks it took me a while though, to get them that good lol

        I'm in Iceland, using 230v system.
        The fuse was the first thing I checked
        how should I check the Cap? plug the monitor in and test it or? sorry i'm still a newbie
        btw I have no ESR tester.
        Correct, with the monitor plugged in, CAREFULLY check the voltage across the large cap. On a 230 volt system you should see about 320 volts across the large cap.

        PlainBill
        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • playman
          Badcaps Veteran
          • Jan 2011
          • 252

          #5
          Re: Neovo F-419 no power.

          Hi again, sorry for the late post.
          I finally was able to check the cap, it mesured 320v

          Comment

          • jetadm123
            Badcaps Legend
            • Feb 2010
            • 2169

            #6
            Re: Neovo F-419 no power.

            Had a quick look at the schematic. Apparently, your monitor has a reset circuit, which if faulty, can cause the problems you describe.

            1) look at the link below, it describes a acer monitor with the same problems you have and describes the function of the reset circuit:

            https://www.badcaps.net/forum/showth...ghlight=max810

            2) the chip on your board is U7, part # MCP809-300 and is located on the logic board.

            3) please post a photo of the logic board.
            Attached Files

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271

              #7
              Re: Neovo F-419 no power.

              Originally posted by playman
              I finally was able to check the cap, it mesured 320v
              Okay, now let's check cold side for secondary DC voltages at connector P803.

              Put your multimeter on 20V DC (if manual). Use a ground screw for your black probe (ground). Put your red probe on each connector pin. Report DC voltage measurement for each pin.
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              Comment

              • playman
                Badcaps Veteran
                • Jan 2011
                • 252

                #8
                Re: Neovo F-419 no power.

                Originally posted by jetadm123
                Had a quick look at the schematic. Apparently, your monitor has a reset circuit, which if faulty, can cause the problems you describe.

                1) look at the link below, it describes a acer monitor with the same problems you have and describes the function of the reset circuit:

                https://www.badcaps.net/forum/showth...ghlight=max810

                2) the chip on your board is U7, part # MCP809-300 and is located on the logic board.

                3) please post a photo of the logic board.
                Hi jetadm123
                I was not able to find the U7 chip, I must be blind
                any way here are the fotos you asked for.
                sorry for the flash on the picture.
                Attached Files

                Comment

                • pedro
                  Senior Member
                  • Dec 2009
                  • 199
                  • AUSTRALIA

                  #9
                  Re: Neovo F-419 no power.

                  Originally posted by playman
                  Hi jetadm123
                  I was not able to find the U7 chip, I must be blind
                  It's east-north-east from the NE corner of U6, half-way to the connector. It's in a SOT-23 style body, only three pins on this device.
                  Friends don't let friends buy Samsung ....

                  Comment

                  • playman
                    Badcaps Veteran
                    • Jan 2011
                    • 252

                    #10
                    Re: Neovo F-419 no power.

                    Originally posted by retiredcaps
                    Okay, now let's check cold side for secondary DC voltages at connector P803.

                    Put your multimeter on 20V DC (if manual). Use a ground screw for your black probe (ground). Put your red probe on each connector pin. Report DC voltage measurement for each pin.
                    I might have done this wrong, but this is what I did.
                    I had the PCB on the table(not connected to the screen), only electrical wire connected, put the black prope
                    into the earth wire from the socket on the PCB, wich connects to the screen metal sceleton.
                    Then probed the 7 wires with the red probe, and got 0 reading on all of them.
                    was that a right way to do it(or one of them)?

                    Update:
                    I just plugged the board into the screen, with everything connected.
                    and all the wires gave 0 reading.
                    Last edited by playman; 05-06-2011, 04:37 AM. Reason: Updated the new findings

                    Comment

                    • playman
                      Badcaps Veteran
                      • Jan 2011
                      • 252

                      #11
                      Re: Neovo F-419 no power.

                      Originally posted by pedro
                      It's east-north-east from the NE corner of U6, half-way to the connector. It's in a SOT-23 style body, only three pins on this device.
                      ah thanks for that, I'm getting blind apearently lol
                      but since the PCB did not give any volts out of it, i'm going to
                      wait until I can see what's going on there.

                      Comment

                      • jetadm123
                        Badcaps Legend
                        • Feb 2010
                        • 2169

                        #12
                        Re: Neovo F-419 no power.

                        Originally posted by playman
                        ah thanks for that, I'm getting blind apearently lol
                        but since the PCB did not give any volts out of it, i'm going to
                        wait until I can see what's going on there.
                        Hopefully, you read the link I provided. If U7 has failed, it prevents the power supply from starting up, which results in zero ouput from the power supply.

                        Comment

                        • sabre504
                          Badcaps Veteran
                          • May 2010
                          • 449
                          • United Kingdom

                          #13
                          Re: Neovo F-419 no power.

                          U7 on pic
                          Attached Files

                          Comment

                          • retiredcaps
                            Badcaps Legend
                            • Apr 2010
                            • 9271

                            #14
                            Re: Neovo F-419 no power.

                            Originally posted by playman
                            I might have done this wrong, but this is what I did.
                            Okay, let me add more detail and try again.

                            1) Put multimeter to 20V DC if manual.
                            2) Disconnect all boards. We are just going to test the power board alone. Put back all screws on the power board.
                            3) Put your black probe on the ground screw. Use the ground screw next to cap C848 (upper left hand corner in your picture). This will be your secondary ground.
                            4) Put your red probe on each pin on connector P803.
                            5) Report measurements for each pin.

                            If you still get 0V DC for all the pins, then measure the DC voltage across capacitor C810 (green small one next to the largest one). Put your black probe on the negative side of the cap and red probe on the positive side.

                            Report and note if the voltage is steady or fluctuating. C810 plays an important part of the startup process for the SMPS. The SMPS generates the secondary voltages that go to P803.
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                            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                            Please do not post inline and offsite as they slow down the loading of pages.

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                            Comment

                            • PlainBill
                              Badcaps Legend
                              • Feb 2009
                              • 7034
                              • USA

                              #15
                              Re: Neovo F-419 no power.

                              Originally posted by jetadm123
                              Hopefully, you read the link I provided. If U7 has failed, it prevents the power supply from starting up, which results in zero ouput from the power supply.
                              Not quite correct.

                              U7 is the reset controller for the processor on the signal card. If it is bad the processor will not start, and the power LED will not come on. You WILL still have the normal voltages out of the power supply.

                              PlainBill
                              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                              Comment

                              • jetadm123
                                Badcaps Legend
                                • Feb 2010
                                • 2169

                                #16
                                Re: Neovo F-419 no power.

                                Originally posted by PlainBill
                                Not quite correct.

                                U7 is the reset controller for the processor on the signal card. If it is bad the processor will not start, and the power LED will not come on. You WILL still have the normal voltages out of the power supply.

                                PlainBill
                                Ah, thanks PlainBill for sending me on the path to enlightenment.

                                Comment

                                • playman
                                  Badcaps Veteran
                                  • Jan 2011
                                  • 252

                                  #17
                                  Re: Neovo F-419 no power.

                                  Originally posted by retiredcaps
                                  Okay, let me add more detail and try again.

                                  1) Put multimeter to 20V DC if manual.
                                  2) Disconnect all boards. We are just going to test the power board alone. Put back all screws on the power board.
                                  3) Put your black probe on the ground screw. Use the ground screw next to cap C848 (upper left hand corner in your picture). This will be your secondary ground.
                                  4) Put your red probe on each pin on connector P803.
                                  5) Report measurements for each pin.

                                  If you still get 0V DC for all the pins, then measure the DC voltage across capacitor C810 (green small one next to the largest one). Put your black probe on the negative side of the cap and red probe on the positive side.

                                  Report and note if the voltage is steady or fluctuating. C810 plays an important part of the startup process for the SMPS. The SMPS generates the secondary voltages that go to P803.
                                  I still got 0 reading from the pins.
                                  The green one is C809 and then brown circle is C810 ( I belive)
                                  anyway I checked the C810 and got 0 reading but for a split second I got the - sign on the DMM.
                                  Some one unknown came to me, and thought it would be funny to startle me,
                                  while I was testing it, so I accedentily touched the big cap, wich created some sparks, but I checked it afterwards and it gave me 321volts.
                                  So I hope I did not do any damage to it. having a double heartattack is not funn

                                  Comment

                                  • playman
                                    Badcaps Veteran
                                    • Jan 2011
                                    • 252

                                    #18
                                    Re: Neovo F-419 no power.

                                    Originally posted by PlainBill
                                    Not quite correct.

                                    U7 is the reset controller for the processor on the signal card. If it is bad the processor will not start, and the power LED will not come on. You WILL still have the normal voltages out of the power supply.

                                    PlainBill
                                    That was exactly what I thought.
                                    Yay +1 for the newbie

                                    Comment

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271

                                      #19
                                      Re: Neovo F-419 no power.

                                      Originally posted by playman
                                      The green one is C809
                                      Sorry, check the green one. I can't see C809 from the angle of the picture.

                                      Put your red probe on the positive leg of the small green cap C809 cap. Put your black probe on the negative leg of the small green cap.
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                                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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                                      Comment

                                      • playman
                                        Badcaps Veteran
                                        • Jan 2011
                                        • 252

                                        #20
                                        Re: Neovo F-419 no power.

                                        Sorry, check the green one. I can't see C809 from the angle of the picture.
                                        No no the fault is mine, since I took the shot slightly tilted.

                                        Put your red probe on the positive leg of the small green cap C809 cap. Put your black probe on the negative leg of the small green cap.
                                        I've allready done that.

                                        anyway I checked the C810 and got 0 reading but for a split second I got the - sign on the DMM.
                                        And if I'm not mistaken, the black part of the circle on the PCB means negative, right?

                                        Comment

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