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    Lg led projector burnt led driver

    Quick edit: forgot to add the model

    Lg PF1000u projector, please admin update the title. Thanks

    Hi everyone

    My projector died out a couple of weeks ago.

    It's not techically dead, I can turn it on and I can hear it boot it properly, can turn it off as well, the fan boots but there was no image, no led turning on at all.

    Yesterday I finally had the time (too busy at work) to disassemble it.

    I opened it up and found out that the led drive part of the board had a short and had burned out. The part is the dlpa3000d from texas instruments.

    It appears that pins 5 to 10 got a short and burned down, hence there is no power to the RGB leds.

    Do you think it is the driver itself that went bad or there is another short on the board probably?

    I have attached the dlpa3000d technical data sheet and some pictures of the led board.

    Thanks
    Attached Files
    Last edited by Cryogen; 06-10-2020, 06:27 AM. Reason: forgot to write down model

    #2
    Re: Lg led projector burnt led driver

    Pin 9 and 10 are low mosfet switch for led. I am starting to suspect that the short is in one or more of the 4 mosfets.

    I will have to test them.

    Comment


      #3
      Re: Lg led projector burnt led driver

      Woah this was so helpful. Thanks guys.
      I mean, thanks me.

      Comment


        #4
        Re: Lg led projector burnt led driver

        Have you removed the faulty IC and checked what damage may have been done to the board and tracks. The IC itself is pretty cheap around £10
        Willing to help but I'm no expert.

        Comment


          #5
          Re: Lg led projector burnt led driver

          Originally posted by dick_barton View Post
          Have you removed the faulty IC and checked what damage may have been done to the board and tracks. The IC itself is pretty cheap around £10
          yes I bought the chip but when I removed the burnt one I found out than the tracks are gone.

          I will have to check for someone who can repair burnt tracks. I don't have the tools to do so.

          Any idea?

          Comment


            #6
            Re: Lg led projector burnt led driver

            How bad is the damage. Post a sharp focused photo.
            Willing to help but I'm no expert.

            Comment


              #7
              Re: Lg led projector burnt led driver

              Originally posted by dick_barton View Post
              How bad is the damage. Post a sharp focused photo.

              Hope they are clear, I can't find the macro in my phone.

              Attached Files

              Comment


                #8
                Re: Lg led projector burnt led driver

                the problem u have the area under the IC. need to take look under side which i think belong to pin 9
                pins 5,8,10 easy to jumper them

                Comment


                  #9
                  Re: Lg led projector burnt led driver

                  give it a good clean

                  Comment


                    #10
                    Re: Lg led projector burnt led driver

                    Originally posted by Diah View Post
                    the problem u have the area under the IC. need to take look under side which i think belong to pin 9
                    pins 5,8,10 easy to jumper them
                    You mean like the short is on the other side of the board?


                    Edit. Wait, you mean you think the short is on any of the 3 smd capacitors beneath the led drive? Yes I thought of doing a full recap anyway.
                    Last edited by Cryogen; 07-24-2020, 05:39 PM.

                    Comment


                      #11
                      Re: Lg led projector burnt led driver

                      Originally posted by petehall347 View Post
                      give it a good clean
                      I will. I have plenty of alcohol but couldn't find a small brush.

                      Comment


                        #12
                        Re: Lg led projector burnt led driver

                        Here new pictures with board cleaned and other side of the led drive.




                        Attached Files
                        Last edited by Cryogen; 07-25-2020, 07:38 AM.

                        Comment


                          #13
                          Re: Lg led projector burnt led driver

                          getting this error for second 2 pics ...Invalid Attachment specified. If you followed a valid link, please notify the administrator

                          Comment


                            #14
                            Re: Lg led projector burnt led driver

                            Originally posted by petehall347 View Post
                            getting this error for second 2 pics ...Invalid Attachment specified. If you followed a valid link, please notify the administrator


                            Sorry pete I had to edit and reupload 20000 times cause I am using my wife's windows and am used to linux distros. I couldn't figure out how to save a rotated picture (I took the picture of the cleaned led drive upside down.

                            Should be fine now.

                            Comment


                              #15
                              Re: Lg led projector burnt led driver

                              Originally posted by Diah View Post
                              the problem u have the area under the IC. need to take look under side which i think belong to pin 9
                              pins 5,8,10 easy to jumper them

                              Pin 9 is probably on c504 on the back of the board?

                              Comment


                                #16
                                Re: Lg led projector burnt led driver

                                Originally posted by Cryogen View Post
                                Pin 9 is probably on c504 on the back of the board?
                                i think so too, but before you go further.. apply 12 VDC to the LEDs see if they come on and there no one shorted or open.

                                Comment


                                  #17
                                  Re: Lg led projector burnt led driver

                                  Originally posted by Diah View Post
                                  i think so too, but before you go further.. apply 12 VDC to the LEDs see if they come on and there no one shorted or open.

                                  How did you figure out that the leds are 12v?

                                  Comment


                                    #18
                                    Re: Lg led projector burnt led driver

                                    its standard for projector till 100 LUM

                                    Comment


                                      #19
                                      Re: Lg led projector burnt led driver

                                      here LEDs function on currents level... you are going to use 12 V with low currents.

                                      Comment


                                        #20
                                        Re: Lg led projector burnt led driver

                                        Originally posted by Diah View Post
                                        here LEDs function on currents level... you are going to use 12 V with low currents.
                                        I was going to apply 5v on the led drive board and see if something overheats.

                                        I need to know if pin 9 is the c504 thought.

                                        I don't wanna jumper and then short the chip again.

                                        I only have a 12v 3A power supply, that doesn't look like low currents.
                                        Last edited by Cryogen; 07-25-2020, 09:07 AM.

                                        Comment

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