Robosapein V2 Bot PCB repair wanted

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Crashpro2003
    Member
    • Nov 2022
    • 12
    • United States

    #1

    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
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30997
    • Albion

    #2
    Re: PCB repair wanted

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


    most things are repaired without a schematic.

    Comment

    • eccerr0r
      Solder Sloth
      • Nov 2012
      • 8701
      • USA

      #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

      • Crashpro2003
        Member
        • Nov 2022
        • 12
        • United States

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


        most things are repaired without a schematic.
        Attached Files

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30997
          • Albion

          #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

          • Crashpro2003
            Member
            • Nov 2022
            • 12
            • United States

            #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

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 30997
              • Albion

              #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

              • Crashpro2003
                Member
                • Nov 2022
                • 12
                • United States

                #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

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30997
                  • Albion

                  #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

                  • Crashpro2003
                    Member
                    • Nov 2022
                    • 12
                    • United States

                    #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

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 30997
                      • Albion

                      #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

                      • diif
                        Badcaps Legend
                        • Feb 2014
                        • 6978
                        • England

                        #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

                        • petehall347
                          Badcaps Legend
                          • Jan 2015
                          • 4426
                          • United Kingdom

                          #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

                          • Crashpro2003
                            Member
                            • Nov 2022
                            • 12
                            • United States

                            #14
                            Re: Robosapein V2 Bot PCB repair wanted

                            Originally posted by stj
                            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

                            • CapLeaker
                              Leaking Member
                              • Dec 2014
                              • 8133
                              • Canada

                              #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

                              • Per Hansson
                                Super Moderator
                                • Jul 2005
                                • 5895
                                • Sweden

                                #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

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 30997
                                  • Albion

                                  #17
                                  Re: Robosapein V2 Bot PCB repair wanted

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

                                  Comment

                                  • lotas
                                    Badcaps Legend
                                    • Jan 2016
                                    • 4573
                                    • Russia

                                    #18
                                    Re: Robosapein V2 Bot PCB repair wanted

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

                                    Comment

                                    • sam_sam_sam
                                      Badcaps Legend
                                      • Jul 2011
                                      • 6037
                                      • USA

                                      #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.

                                      Comment

                                      • Per Hansson
                                        Super Moderator
                                        • Jul 2005
                                        • 5895
                                        • Sweden

                                        #20
                                        Re: Robosapein V2 Bot PCB repair wanted

                                        Originally posted by lotas
                                        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

                                        Related Topics

                                        Collapse

                                        • Tynan Dill
                                          Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                          by Tynan Dill
                                          I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                          Upon bringing it home and plugging it up, it showed a standby light.

                                          I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                          The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                          With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                          Assuming...
                                          11-22-2024, 01:46 PM
                                        • m1ch43lzm
                                          HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
                                          by m1ch43lzm
                                          Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
                                          Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
                                          05-12-2025, 08:37 PM
                                        • Hakuu
                                          LG OLED77G1PUA - No Video / Audio after a TCON Board change and Software Update
                                          by Hakuu
                                          Hi There,

                                          This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.

                                          After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.

                                          More Details

                                          TV Model - LG OLED77G1PUA

                                          Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt...
                                          07-12-2023, 02:37 PM
                                        • jb_Bak
                                          Sony xbr-65x900c main board issues?
                                          by jb_Bak
                                          Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.

                                          Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
                                          Power Board Connector that goes to Main board
                                          CN6401
                                          Pin 01 NC
                                          Pin 02 NC
                                          Pin 03 "BL_ON": 0V
                                          Pin 04 "N/C"
                                          Pin 05 "STBY 3.3V": 3.5V
                                          Pin 06 "GND": N/C
                                          Pin 07 "AC_OFF"...
                                          09-27-2021, 04:52 PM
                                        • canadaboy25
                                          Panasonic TC-P54VT25 No image. A or D board?
                                          by canadaboy25
                                          I have a Panasonic TC-P54VT25 that will power on and prime the display but there is no image at all.

                                          The panel is primed as there is a slight glow from the entire panel. This means the problem should be logic related. The service manual also confirms this and recommends replacing the A or the D board.

                                          I have tried to get the TV to display the test sequence but I have been unable to and I don't even know if this TV has a test sequence or not. I tried following tom66's instructions in post #3 on this thread https://www.badcaps.net/forum/showthread.php?t=26790. There was...
                                          01-17-2021, 01:06 AM
                                        • Loading...
                                        • No more items.
                                        Working...