High Voltage Shocker - components blown in new machine

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Douglasbell01
    Member
    • Oct 2013
    • 14
    • United Kingdom

    #21
    Re: High Voltage Shocker - components blown in new machine

    The fuse on the board (when it originally blew) had darkened glass (scattered metal?).

    Since testing again with the step-down voltage convertor (without replacing the MOV), 2x fuses have popped. Clear glass.

    Comment

    • goontron
      5000!
      • Dec 2011
      • 4108
      • US

      #22
      Re: High Voltage Shocker - components blown in new machine

      check that you got the correct rated fuses if you do it sounds like you might have a half shorted component, its the fuse the board blowing clear correct?
      Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

      "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

      Excuse me while i do something dangerous


      You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

      Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

      Follow the white rabbit.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: High Voltage Shocker - components blown in new machine

        Yep, that is the good old trick when look at the glass fuse, if it is blacken inside the fuse, then you have really shorted load. Just like the one shown in the post 1 when MOV blown.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • Douglasbell01
          Member
          • Oct 2013
          • 14
          • United Kingdom

          #24
          Re: High Voltage Shocker - components blown in new machine

          Thanks. It sounds like there's a half-shorted component in that case, because the new fuse blows clear.

          Next step ideas? From earlier posts, it sounds as if I need to work out a way to test the resistance of components around the fuse. So there may well be another 1/2/3/4/5 components to replace.

          Are you optimistic of this being reparable? I may be able to buy/borrow testing gear. But don't want to waste anyone's time.
          Last edited by Douglasbell01; 10-17-2013, 11:33 AM.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: High Voltage Shocker - components blown in new machine

            You mean the fuse on that power supply board is blowing? Did you do any resistance testing as suggested on post 15? Any pictures of the whole board both sides?
            Last edited by budm; 10-17-2013, 11:34 AM.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • Douglasbell01
              Member
              • Oct 2013
              • 14
              • United Kingdom

              #26
              Re: High Voltage Shocker - components blown in new machine

              Yes, the fuse in the photos is the one that blows still (before changing the MOV, but with a step-down convertor in use).

              I've not managed to do any resistance testing (but will try to get the gear to do this).

              Also, the machine is stored at a friend's house. I'll try to photograph the board (both sides) asap.

              Comment

              • Douglasbell01
                Member
                • Oct 2013
                • 14
                • United Kingdom

                #27
                Re: High Voltage Shocker - components blown in new machine

                WOW, multimeters are cheap! Just found one (new, free postage) for roughly $5 US on Ebay UK. http://tinyurl.com/ml7vgq9

                Comment

                • momaka
                  master hoarder
                  • May 2008
                  • 12170
                  • Bulgaria

                  #28
                  Re: High Voltage Shocker - components blown in new machine

                  Wait, so did you take out the blown MOV out yet? If you haven't, you will keep blowing fuses.

                  Comment

                  • Douglasbell01
                    Member
                    • Oct 2013
                    • 14
                    • United Kingdom

                    #29
                    Re: High Voltage Shocker - components blown in new machine

                    Replaced the MOV and fuse. Machine working again!

                    Then the step down transformer blew after about an hour's use. Easily replaced. Wrong values.

                    Comment

                    • bexy2386
                      New Member
                      • Dec 2013
                      • 1
                      • UK

                      #30
                      Re: High Voltage Shocker - components blown in new machine

                      douglasbell01 did you manage to fix your yudu printer? I have just done exactly the same. Any advice? Does it work fine now with a convertor plug now you have replaced the fuse? I have no idea how to go about fixing the fuse!

                      Comment

                      • Agent24
                        I see dead caps
                        • Oct 2007
                        • 4951
                        • New Zealand

                        #31
                        Re: High Voltage Shocker - components blown in new machine

                        Originally posted by Douglasbell01
                        WOW, multimeters are cheap! Just found one (new, free postage) for roughly $5 US on Ebay UK. http://tinyurl.com/ml7vgq9
                        For that price, including shipping, that's not a multimeter, that's garbage, really.
                        "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                        -David VanHorn

                        Comment

                        • DjKrish
                          Badcaps Veteran
                          • Oct 2012
                          • 354
                          • SG

                          #32
                          Re: High Voltage Shocker - components blown in new machine

                          When a fuse blows, diodes, power transistor and bridge rectifiers are the first to check followed by other components.

                          Comment

                          Related Topics

                          Collapse

                          • Babbar
                            Argon SA1 audio amplifier power-supply - fuse blown after fixing the short?
                            by Babbar
                            I found a project in the electronics trash yesterday. A nice Argon SA1 audio amp with some electrical issue. Took it apart and saw that the 4A250V fuse was blown so started lifting components to find the short. Eventually got to two MOSFETs (model FTA14N50C) that are shorted and when i took them out the short was gone.

                            Now i didn't have any replacements of the same model of course but i found a couple with pretty similar spec i thought (K10A60D & K12A50D) and put them in. Also replaced the blown fuse with a 3.5A250V one. Checked another time for short circuit and plugged it in....
                            04-12-2024, 01:12 AM
                          • drscoot
                            HP X360 convertible battery blown fuse error, not charging
                            by drscoot
                            HP Modelnumber: 14-dh0061nb​
                            This laptop had a shorted cap on a Vcore section. After replacement is works again. But there is still a battery issue.
                            The battery is HT03XL and with the built-in component test from HP, in the Power section, I get an error: Logic State: Calibration required (20), Charge state: Blown Fuse (42)
                            I have another same battery, also with error: Logic State: Very Weak (70), Charge state: Blown Fuse (42)
                            And a third battery TF03XL (looks identical) with error: Logic State: OK (0), Charge state: Blown Fuse (42)
                            All these 3 batteries are charging...
                            12-15-2023, 05:54 AM
                          • beetle1303
                            Carver CM-1090 - Power relay clicking on & off, then fuse blown after 20-30 seconds of power cycling.
                            by beetle1303
                            I gotten a Carver CM-1090 amplifier from a friend who has kept it in storage for decades. Opened it up, thick layer of dust cumulated everywhere. Vacuumed it semi-cleaned, and blown off as much as possible the remaining dust. This is a 220V version.

                            On initial powered up with nothing connected - it works with all the lights and button indicator lit up as pressed, etc. I then powered off, connected a CD player into the CD RCA input and powered it on. It seemed to work for a short while and when I turned the volume up and down to see the the VUs works, the power started to clicked off...
                            01-13-2025, 08:49 PM
                          • jesterace
                            Samsung UE46ES8000 Blown fuse but no other signs of short
                            by jesterace
                            Hi I wonder if anyone might be able to steer me in the right direction. I have this Samsung UE46ES8000 TV and it went bang during use. The main fuse on the PSU board is open. I've checked every diode/mosfet/transistor I can see and nothing appears to be short to cause the fuse to go. The DC output of the bridge rectifier is not short either. I've seen online that some of these models are known for having their PFC mosfet or other mosfets shorting and blowing the fuse but i'm not seeing that here. If anyone aware of these models having any issues to cause this? I'm reluctant to just replace the...
                            09-11-2024, 03:14 PM
                          • JupTec
                            Thermal fuse for DeLonghi coffee machine EN 167.B
                            by JupTec
                            I would like to know the "thermal value" of the thermal fuse for the coffee machine "DeLonghi EN 167.B". This value is nor longer visible on the fuse itself (maby 167°C or 192°C or somethong similar ?).
                            THANK YOU for your help!
                            JupTec
                            06-18-2024, 06:54 AM
                          • Loading...
                          • No more items.
                          Working...