Dell 2407WFPb shuts off after 90 minutes

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  • sgt_az
    New Member
    • Jul 2009
    • 9
    #1

    Dell 2407WFPb shuts off after 90 minutes

    I have two Dell 2407WFPb monitors that shut off after 90 minutes or so and need to be unplugged and plugged back in to restart. Both monitors will run all day with the back cover off for troubleshooting. I've read through the threads on repairing these monitors when they completely die. I'm hoping to correct the problem before there is the typical catastrophic component failure when the 120uf 450v capacitor fails.
    I've pulled most of the electrolytic caps and tested them with an ESR meter and most look to be well within spec. I've ordered replacement capacitors to completely recap all three boards in these monitors anyway. Does anyone have a suggestion on what to look at if replacing the capacitors doesn't cure the thermal issue? I've checked all heat sinks, solder joints, and wire connectors already. Suggestions would be greatly appreciated. Thanks.
    Tags: None
    • jetadm123
      Badcaps Legend
      • Feb 2010
      • 2169
      #2
      Re: Dell 2407WFPb shuts off after 90 minutes

      Since they work fine with the back cover off, it sounds like a heat related problem. With the monitor running, try heating up each board with a hair dryer to see if you can get the monitor to shut down. This should hopefully isolate which board/area is causing the problem.

        Comment

        • sgt_az
          New Member
          • Jul 2009
          • 9
          #3
          Re: Dell 2407WFPb shuts off after 90 minutes

          Update. I was able to get all of the replacement capacitors through Mouser.com. Ended up using a 420v 120uf capacitor to replace the 450v 120uf capacitor on the power supply board. I replaced all of the capacitors on just the power supply board to start with and so far both monitors have run for 24 hours without shutting off. If this holds up the fix will have consisted of: one 420v 120uf cap, five 35v 470uf caps, one 25v 220uf cap, two 50v 47uf caps, and one 100v 1uf cap.

          Mouser part numbers:
          120uf 450v ----> 120uf 420v Mouser.com pt# 647-UPTW6121MHD QTY 1
          470uf 35v ----> 470uf 35v Mouser.com pt# 667-EEU-FR1V471B QTY 5
          220uf 25v ----> 220uf 35v Mouser.com pt# 647-UHV1V221MPD QTY 1
          47uf 50v ----> 47uf 50v Mouser.com pt# 647-UVR1H470MED1TA QTY 2
          1uf 100v ----> 1uf 100v Mouser.com pt# 647-UVZ2A010MDD1TD QTY 1

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