Atec AV420D No Standby

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  • anotherdude
    Badcaps Veteran
    • Feb 2013
    • 488
    • uk

    #1

    Atec AV420D No Standby

    Picked this up yesterday for £30 fault was described as "won't turn on it used to turn on after 20 minutes but now theres no standby light"

    So i took the psu out and removed the old fuse near the 250v input and replaced it with another I had off a faulty board.

    It now gets a standby light for all of 5 seconds then konks out, no sign of any other damage anywhere

    top of caps get low voltages and gradually drop as the standby light dissappears

    samxon caps too
    Attached Files
    Last edited by anotherdude; 12-22-2013, 08:00 AM.
  • anotherdude
    Badcaps Veteran
    • Feb 2013
    • 488
    • uk

    #2
    Re: Atec AV420D No Standby

    found this thread that tom66 fixed https://www.badcaps.net/forum/showth...highlight=atec

    there not the same psu so not sure it's the same fault

    what should i be looking for if standby voltage disappears?

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Atec AV420D No Standby

      Check if the PSU 5V standby is stable or not.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • anotherdude
        Badcaps Veteran
        • Feb 2013
        • 488
        • uk

        #4
        Re: Atec AV420D No Standby

        Originally posted by tom66
        Check if the PSU 5V standby is stable or not.
        at the stby 5v pin i get 4.96v so would appear to be stable?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Atec AV420D No Standby

          Check what the PSON signal is doing.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • anotherdude
            Badcaps Veteran
            • Feb 2013
            • 488
            • uk

            #6
            Re: Atec AV420D No Standby

            Originally posted by tom66
            Check what the PSON signal is doing.
            sorry tom i appreciate your help but i can't seem to see anything labelled with PSON

            better image of the board

            Comment

            • anotherdude
              Badcaps Veteran
              • Feb 2013
              • 488
              • uk

              #7
              Re: Atec AV420D No Standby

              ok was going through checking all the pins for voltage to see if they were correct and funnily enough the screen turned on and it worked but theres a flicker to the screen including menus too. turned it off and back on and now no picture again and no standby light

              so seems it has to get warmed up so to speak before it will turn on, caps?
              Last edited by anotherdude; 12-22-2013, 10:24 AM.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Atec AV420D No Standby

                D5-ON might be the pin.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • anotherdude
                  Badcaps Veteran
                  • Feb 2013
                  • 488
                  • uk

                  #9
                  Re: Atec AV420D No Standby

                  Originally posted by tom66
                  D5-ON might be the pin.
                  ok when i power on the standby light comes on at the d5-on pin i read 1.45v and when the standby light disappears it drops to 0.03v

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Atec AV420D No Standby

                    OK, and what do the D5V, D12V do during this?
                    Seems like main board fault.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • anotherdude
                      Badcaps Veteran
                      • Feb 2013
                      • 488
                      • uk

                      #11
                      Re: Atec AV420D No Standby

                      from power on D5V gets to 2.20-2.40v and continues to drop to 1.20v and slowly continues to drop

                      D12V after the standby light disappears sits at 0.63v

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Atec AV420D No Standby

                        That is bad, then. On the power supply.
                        Take a 100 to 470 ohm resistor and connect it between 5V standby and D5 ON, do the main voltages rise?
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • anotherdude
                          Badcaps Veteran
                          • Feb 2013
                          • 488
                          • uk

                          #13
                          Re: Atec AV420D No Standby

                          12v still sits a 0.63v with a 100ohm resistor connected to 5v stby and d5 on

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Atec AV420D No Standby

                            Try warming up the PS board with a hairdryer to see if that increases; also try isolating all connections from the PSU board.
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • anotherdude
                              Badcaps Veteran
                              • Feb 2013
                              • 488
                              • uk

                              #15
                              Re: Atec AV420D No Standby

                              ok tom your on to something

                              gave it some heat at first i was hearing popping from the speakers and the voltage on 12v was rising i continued with the heat until it hit 12v and the screen turned on and the popping disappeared

                              assuming bad caps now from previous experience?

                              also the screen flickering has gone
                              Last edited by anotherdude; 12-22-2013, 11:28 AM.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Atec AV420D No Standby

                                I'd try focusing heat on the capacitors on the primary side, over the ones on the secondary.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                • anotherdude
                                  Badcaps Veteran
                                  • Feb 2013
                                  • 488
                                  • uk

                                  #17
                                  Re: Atec AV420D No Standby

                                  Originally posted by tom66
                                  I'd try focusing heat on the capacitors on the primary side, over the ones on the secondary.
                                  so the side with the majority of the caps?

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: Atec AV420D No Standby

                                    No, that's the secondary. Primary has the mains voltage on it. i.e. do not touch, hurty electric side.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • anotherdude
                                      Badcaps Veteran
                                      • Feb 2013
                                      • 488
                                      • uk

                                      #19
                                      Re: Atec AV420D No Standby

                                      ok tom i've narrowed it down to this
                                      Attached Files

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: Atec AV420D No Standby

                                        I would replace all the small caps in that area. In fact I'd also replace the two near IC6, too.

                                        Now CPC offers free delivery from £0.01 and stocks Panasonic caps, I'd not order anywhere else:
                                        http://cpc.farnell.com/

                                        Won't arrive before Xmas though.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

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