Troubleshooting L240AS-00 - fails every other time

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • cruiser_
    Senior Member
    • Nov 2019
    • 124
    • Ireland
    #1

    Troubleshooting L240AS-00 - fails every other time

    hi there,

    I am trying to troubleshoot the ATX in question.
    I have it connected in series with a bulb.

    It randomly goes into startup trouble where the bulb turns itself fully on, only to work ok right after turnoff/turnon cycle.

    I checked the primary side - caps capacities (including main filtering one), bridge, diodes, transistors, soldered off varistors. nothing blown.

    the PSU is based on ICE3AR2280JZ, datasheet
    https://cdn.badcaps-static.com/pdfs/...1656e817fe.pdf

    Here's a video showing the behavior
    - first switch on - short / loop
    - second switch on - works OK
    - third switch on - short / loop

    https://photos.app.goo.gl/ysfM64W3SYHL7KFH8

    I would appreciate some guiding hand as to where to go next.
    Tags: None
    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6037
      • USA
      #2
      Re: Troubleshooting L240AS-00 - fails every other time

      Okay
      I have two questions for you

      When the power supply starts correctly want are the voltages on each rail

      What happens if you do not have the light bulb in the circuit does it blow the fuse

        Comment

        • cruiser_
          Senior Member
          • Nov 2019
          • 124
          • Ireland
          #3
          Re: Troubleshooting L240AS-00 - fails every other time

          hi there!

          so the results are all good
          3.3 - 3.41V
          5 - 5.06V
          5VSB - 5.11V
          12V - 12,13V
          -12V - -11,26V
          PWROK - 4,68V

          Re the fuse & bulb. I looked into this PSU since it stopped working reliably (randomly turning off).
          I blew the fuse during one of the trial runs - possible short of the probes.
          Now I'm afraid to run the whole thing without it

          by the way - if I don't short PWRON, then the 5VSB is always there and there is no short ...
          Last edited by cruiser_; 05-21-2020, 04:49 AM.

            Comment

            • cruiser_
              Senior Member
              • Nov 2019
              • 124
              • Ireland
              #4
              Re: Troubleshooting L240AS-00 - fails every other time

              BTW ICE3AR2280JZ is just one of the (at least) three ICs for PWM/PFC.
              The other one is FAN4800A. The third one is possibly the same but I can't get to it to confirm.
              https://cdn.badcaps-static.com/pdfs/...3d894205a5.pdf

                Comment

                • SMDFlea
                  Super Moderator
                  • Jan 2018
                  • 20709
                  • UK
                  #5
                  Re: Troubleshooting L240AS-00 - fails every other time

                  a related L240AS-00 post,might help you https://www.badcaps.net/forum/showth...ight=L240AS-00
                  All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • CoppellTVRepair
                      Troubleshooting PFC with SPC1012T not raising output
                      by CoppellTVRepair
                      It has been a long while since I posted here to ask anything....hope you can help.

                      I have this Samsung power supply that uses SPC1012T as driver for the PFC and it's giving me a problem that I can't narrow down though I've troubleshooted and fixed hundreds of boards similar circuits.

                      I am attaching a schematic from a different Samsung board, but the topography is very very similar if not 100% the same and it uses SPC1012T, which BTW is a pinout match to UCC28063 for which there's plenty of information. I haven't confirmed they are functional equivalents, but I strongly...
                      03-09-2025, 10:38 PM
                    • nicktasios
                      Macintosh Quadra 840AV PSU
                      by nicktasios
                      I had my Quadra 840AV (which I recapped and had working) plugged in for some time without using it and randomly decided to turn it on today. Unfortunately it did not turn on. After checking the PSU, I found out I was not getting anything from 12V, only from the 5V rail. After a few minutes, I removed the PSU and plugged it back in the electrical outlet and it suddenly started making a weird sound and soon after smoke started coming out. I quickly unplugged it. I opened it up but on first instance I didn't see anything out of the ordinary really. I later turned it back on and one of the MOVs blew...
                      1 Photo
                      12-22-2024, 05:07 AM
                    • ikelectro
                      After bios recovery by pen drive HP15s eq0007AU display flashing a light for short time.
                      by ikelectro
                      Schematic : DAOP5EMB6E0 REV:E​

                      I have tried manually flashed the bios, also tried hp bios recovery tools to recover the bios. But no luck. Display is not coming, 3 to 4 times recovery display is coming if I tried to recover by pen drive[win+ B]. But after restarts it goes to dark screen and a light is flashing after a certain time in the display + fan speeds increasing and decreasing. I have tried almost every bios for this motherboard avaiable in the internet.
                      Any help or guide to proceed?...
                      1 Photo
                      03-19-2025, 08:17 PM
                    • jake-b
                      dell e6540 boots to black screen (no dell logo)
                      by jake-b
                      good morning all,

                      i purchased a used dell e6540 laptop used 10 months ago from a vendor on ebay. intel i-7 processor, 16 gb ddr3 memory, 256 gb ssd., mobo la-9413p (rev 1.0 dated 2014-08-04). i've inflicted no damage on it since purchase but its past is unknown. starting 2 weeks ago it began to fail to boot (initially 9 of 10 boot attempts failed, now 10 of 10 fail). there was no new hardware or software added (i was using as a kodi video server). the post process doesn't complete and booting no longer displays the dell logo screen - screen remains black with no backlight. some other...
                      01-08-2024, 10:29 AM
                    • sew333
                      Light bulb flicker when turning on after long time off.
                      by sew333
                      Hello. I have question. I dont know if i have faulty wiring,bad installation or its bulb. When i have lights off long time and turn on lightning ( bulb halogen ) , there is a for 2-3 second bulb dimm/flicker and its normal. Happens only when lightning is off long time and i turn on.

                      When i turn off lights and turn on again its fine. That flicker/dimm happens only when lights are off long time.
                      That happens for example if i have lights off 2-3 hours and turn on.
                      Thx
                      02-16-2021, 01:39 PM
                    • Loading...
                    • No more items.
                    Working...