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Robosapein V2 Bot PCB repair wanted

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    Robosapein V2 Bot PCB repair wanted

    Anyone know of a good circuit board repair company that can fix a board without a schematic or board view?
    Last edited by SMDFlea; 11-30-2022, 06:04 PM. Reason: Added "Robosapein V2 Bot" to thread title

    #2
    Re: PCB repair wanted

    thats vague, what is it?
    got any pictures?
    fault description?


    most things are repaired without a schematic.

    Comment


      #3
      Re: PCB repair wanted

      Have to assume it's the robot. but if it's visibly damaged it usually can be done without schematic. If it's not visibly damaged and there's no obvious signs (shorts, etc.) then it gets mighty hard without a schematic and repair costs increases rapidly due to debug time...of which a reverse engineered schematic may be needed/generated, which may end up above the cost of a new unit...

      Comment


        #4
        Re: PCB repair wanted

        It's a circuit board out of a discontinued vintage Robosapein V2 Bot I'm Trying to repair. Board seems to be dead due to cheap wire insulation. It flakes and falls off, then shorts something out in all units. Bot is not working after being rewired. And I can not find the schematic or board views for it anywhere online. There appears to be a burn mark on the board which is circled in the attached photo. Although it could also be a blue company test check mark covered in flux, placed after manufacturer tested it. Not sure. Looking for someone to check over the board and fix it if needed.





        Originally posted by stj View Post
        thats vague, what is it?
        got any pictures?
        fault description?


        most things are repaired without a schematic.
        Attached Files

        Comment


          #5
          Re: Robosapein V2 Bot PCB repair wanted

          the mark is marker pen under the glue.
          the glue is the cause/problem, it becomes conductive when it gets old.
          this is a well known curse in psu's and audio gear.
          you need to get the glue off by lifting it with a small flat screwdriver or similar

          Comment


            #6
            Re: Robosapein V2 Bot PCB repair wanted

            Wow No shit? There is a lot it on the board. I know this sounds like dumb question. But does that mean that every component that it is in contact with is potentially shorted out? I thought it was just dried liquid flux. Thanks for the information.

            Comment


              #7
              Re: Robosapein V2 Bot PCB repair wanted

              it's not going to be dead-short,
              but it will have a resistance that drops as it darkens and ages - when it's really bad the glue turns almost black and very hard.
              it can also be corrosive to the component legs

              Comment


                #8
                Re: Robosapein V2 Bot PCB repair wanted

                The glue on the board has the characteristics of rubber or contact cement. It stretches a lot before it begins to peel off. Don't want to scratch at it too hard so as to not damage any traces on it. I have found out that Mineral Spirits will help remove rubber cement. Will using it, sparingly, damage the coatings or other parts on the board?
                Thanks

                BTW You have been the greatest help to me so far.

                Comment


                  #9
                  Re: Robosapein V2 Bot PCB repair wanted

                  i dont think meth-spirit will damage anything, but i know acetone will.
                  test the spirit to see if it damages the connectors though.

                  Comment


                    #10
                    Re: Robosapein V2 Bot PCB repair wanted

                    Hi
                    I dabbed on Isopropyl alcohol (didn't soak board in it) to soften the glue and carefully picked all of it off. Bot still not working. Attention now is on the Main board marked with EW and numbered (6028-1G). Good call BTW. The mark on the board was made with a marker, not a burn mark. Shouldn't there be a copy of the schematic and board views for these boards out there somewhere?
                    Thanks again for all your help

                    Comment


                      #11
                      Re: Robosapein V2 Bot PCB repair wanted

                      boardview is just a mac thing,
                      schematics are down to the maker to share or not.
                      that board you cleaned doesnt really need one,
                      it's clearly just a repeating pattern of transister switch circuits presumably to let the logic signals drive the motors.
                      if it failed it would only effect one motor

                      Comment


                        #12
                        Re: Robosapein V2 Bot PCB repair wanted

                        Boardviews are most commonly known for Apple devices but it's not an exclusive thing, I have some from Dell. HP, IBM, Toshiba and some for graphics cards.

                        Comment


                          #13
                          Re: Robosapein V2 Bot PCB repair wanted

                          probe the glue with your dmm and see if it really is conductive ..this is how i found it myself before i found it myself and reported it on the internet . sansui were bad for it .

                          Comment


                            #14
                            Re: Robosapein V2 Bot PCB repair wanted

                            Originally posted by stj View Post
                            i dont think meth-spirit will damage anything, but i know acetone will.
                            test the spirit to see if it damages the connectors though.
                            Think I may have found the issue of "no power." White smoke or heat mark on back of Main Board. Behind what might be a fuse or thermal cut off or coil for chip but unsure. It's labeled DY 4.000 See attachments. Tested across poles and it is open, no continuity. Also don't know what DY stands for or where to get a replacement. Any help will be appreciated again. Can you private message me with your thoughts on this? Being a Newb I have a tough time navigating this forum. Thanks again
                            Attached Files

                            Comment


                              #15
                              Re: Robosapein V2 Bot PCB repair wanted

                              That is a 4 MHz crystal. That could be a failure point, but I think the problem is elsewhere, because you need to get power first.

                              Comment


                                #16
                                Re: Robosapein V2 Bot PCB repair wanted

                                Check the area marked in a blue rectangle, is that trace broken or is it just an optical illusion?
                                Attached Files
                                "The one who says it cannot be done should never interrupt the one who is doing it."

                                Comment


                                  #17
                                  Re: Robosapein V2 Bot PCB repair wanted

                                  nice find.
                                  it actually looks both burned AND on a through-hole to me.

                                  Comment


                                    #18
                                    Re: Robosapein V2 Bot PCB repair wanted

                                    No, these are the remains of rosin when this module was soldered manually.

                                    Comment


                                      #19
                                      Re: Robosapein V2 Bot PCB repair wanted

                                      Look closely at all the soldering joints for ghosting rings around the the bottom of the joints or a lot of flux or corrosion on the soldering joints or cracked soldering joints ( I see some soldering joints that look very ? able
                                      I would look at under a magnifying glass for what I have above )

                                      After that then start looking up part numbers and see what they are and checking them for functionality

                                      Both of them are very time consuming projects

                                      I once fixed a battery operated magnet plate for steal plate crane lifting device that the hole board had corrected soldering joints I had resolder the entire board and did manage to get the device to work correctly again but it took several days to do this

                                      The small red board on the main part of circuit board looks like it is some type of micro controller which could be damaged by the shorting of wires hopefully not

                                      Please post a picture of power supply board as well because the issue might be on this board as well
                                      Last edited by sam_sam_sam; 12-09-2022, 07:36 PM.
                                      9 PC LCD Monitor
                                      6 LCD Flat Screen TV
                                      30 Desk Top Switching Power Supply
                                      10 Battery Charger Switching Power Supply for Power Tool
                                      6 18v Lithium Battery Power Boards for Tool Battery Packs
                                      1 XBox 360 Switching Power Supply and M Board
                                      25 Servo Drives 220/460 3 Phase
                                      6 De-soldering Station Switching Power Supply 1 Power Supply
                                      1 Dell Mother Board
                                      15 Computer Power Supply
                                      1 HP Printer Supply & Control Board * lighting finished it *


                                      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                                      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                                      2 Hem Saw Computer Stack Board

                                      All of these had CAPs POOF
                                      All of the mosfet that are taken out by bad caps

                                      Comment


                                        #20
                                        Re: Robosapein V2 Bot PCB repair wanted

                                        Originally posted by lotas View Post
                                        No, these are the remains of rosin when this module was soldered manually.
                                        You need to look in the blue rectangle I put, not the red circle drawn by Crashpro2003.
                                        "The one who says it cannot be done should never interrupt the one who is doing it."

                                        Comment

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