Help me identify this little bugger (schotty diode?)

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Adrian_
    Member
    • Mar 2017
    • 40
    • Romania
    #1

    Help me identify this little bugger (schotty diode?)

    This motherboard does nothing when power button is pressed, and this little bugger appears to be shorted. (0.4ohm between the lower two legs, either way)

    Only I cannot find any reference about the exact type. I'm guessing one of these https://cdn.badcaps-static.com/pdfs/...3a27052316.pdf but I'm not knowledgeable enough. Could be way off...

    Thanks a lot for any help.
    Attached Files
    Tags: None
    • Adrian_
      Member
      • Mar 2017
      • 40
      • Romania
      #2
      Re: Help me identify this little bugger (schotty diode?)

      The markings are "KL3" written horizontally and "V1" written vertically. The photo is a bit fuzzy but the damn thing is very small (3-4mm I'd say)

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30991
          • Albion
          #3
          Re: Help me identify this little bugger (schotty diode?)

          BAT54 duel schottky diode
          30v
          200ma
          200mw

            Comment

            • Adrian_
              Member
              • Mar 2017
              • 40
              • Romania
              #4
              Re: Help me identify this little bugger (schotty diode?)

              Thanks for the reply. That's what I thought as well, the problem is identifying the correct type of BAT54. According to my readings it should be a common cathode B54C, the problem being that I identified another on a working motherboard and it also has continuity between the two anodes...

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30991
                  • Albion
                  #5
                  Re: Help me identify this little bugger (schotty diode?)

                  maybe the pads are connected to double the current handling.

                    Comment

                    • Adrian_
                      Member
                      • Mar 2017
                      • 40
                      • Romania
                      #6
                      Re: Help me identify this little bugger (schotty diode?)

                      Could be, I'll check to see if both anodes track to the same front panel pin or something like that...

                        Comment

                        • Longbow
                          Badcaps Veteran
                          • Jun 2011
                          • 623
                          • USA
                          #7
                          Re: Help me identify this little bugger (schotty diode?)

                          There are zillions of these BAT54 dual diodes in SMD boards of many types. I will guess that it is simpler to use a package that is identical to most of the other parts, to make it easier for the assembly machines. Seems like most of the schematics I see use plenty of these as steering diodes on VFD display boards or system control boards. Did a new part fix the problem?
                          Is it plugged in?

                            Comment

                            • stj
                              Great Sage 齊天大聖
                              • Dec 2009
                              • 30991
                              • Albion
                              #8
                              Re: Help me identify this little bugger (schotty diode?)

                              could be a case of 500 single diodes cost 1penny each, 500 dual diodes cost 1penny each,
                              but 1000 diodes cost 0.5pence each

                              so you just buy reels of the dual type.

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • hobostove
                                  Corsair RM1000e - Help identify 5VSB Zener diode
                                  by hobostove
                                  Hey there guys. I've got a Corsair power supply that's come across my bench dead. I usually don't mess with power supplies, but it's a slow week so I'm giving it a whirl.

                                  Taking it apart I heard a screw rattling around inside, and when I got it apart I found a couple blown components near what I think is the 5VSB area.

                                  There's a 22ohm resistor that's melted and open, but it still has the bands.

                                  The other part is a zener diode and it's top went to jesus, so I can't read the marking.

                                  It looks like the diode connects the source and drain of a TNY284...
                                  03-27-2025, 02:25 PM
                                • jjne
                                  AUO M270QAN01 - identify diode?
                                  by jjne
                                  Hi,

                                  I have a small number of monitors based on the above panel and am working through them. I have at least two with a single, burned-out diode. From what I can see it's something like DI428 or DII428 or DH428. Here's a picture of a working one.

                                  Can anyone identify this please? Based on the number 428 it may be a shottky or a Zener according to Google. The device in question is D105.

                                  ETA I can confirm that the number is definitely 428 (I took a video which revealed a better image), the DII appears to be a maker's mark. There's also a code 1G. Looking around...
                                  1 Photo
                                  01-24-2024, 08:39 PM
                                • jezzaaaa
                                  Identify replacement diode
                                  by jezzaaaa
                                  I'm trying to find a replacement diode for one that has gone short.

                                  I have a generic USB charger that went short circuit to ground on 5V. I found that one of a pair of identical diodes in parallel (and in series with transformer secondary winding) has gone short in both directions, so I suspect it's bad. The marking is CSRS1045, which I believe is a low barrier Schottky with max current 10A and max reverse 45V. I found a spec sheet for CSRS1045-A that has same specs and also says 350mV drop when forward biased.

                                  I can't find the exact part number for sale. Similar...
                                  05-09-2023, 11:26 PM
                                • gurj1979
                                  Ubiquitiu 24 port POE. Help Identify Diode 3pin)
                                  by gurj1979
                                  Hi again guys.
                                  Ive got a Ubiquiti 24 port POE Switch which has failed to work. Fans turn on, but no lights.
                                  I've ripped the board out, flipped it upside down and noticed a blown 3pin SMD Diode (at location D53). Marking is ESSP (as with all the other Diodes in the same row).

                                  Anyone help me identify the model of this Diode ?...
                                  08-23-2023, 08:39 AM
                                • digitalblade
                                  help for identify an smd diode
                                  by digitalblade
                                  I need to identify the diode on attached image. is an SMD diode on damaged board.
                                  As more wide question... there is a way to identify any smd component in a more or less simple way?
                                  Every time that i need to identify some components with no schematics is a nightmare for me!

                                  Thank you for any kind of support!...
                                  07-18-2021, 10:13 AM
                                • Loading...
                                • No more items.
                                Working...