e153fpb brightness goes down in 2 secs

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  • LearnStuff
    New Member
    • Jan 2009
    • 3
    #1

    e153fpb brightness goes down in 2 secs

    I have a 15" Dell lcd monitor e153fpb that I am troubleshooting. Turn on the monitor, display looks fine for 2 seconds only and the brightness goes down to almost none. But display is there it is very faint. Turn it off and on, again it looks bright for 2 secs only. Same thing happens when I connect to my laptop and keep toggling from laptop to monitor. Every time the display stays bright for 2 seconds only. Did anyone saw this problem?

    I opened the monitor and apparently all components and solder joints look fine. Does anybody have the schematic? Any suggestions to identify the faulty component is appreciated. Thanks
    Tags: None
    • PCBONEZ
      Grumpy Old Fart
      • Aug 2005
      • 10661
      • USA
      #2
      Re: e153fpb brightness goes down in 2 secs

      I dunno where to get a schematic.

      Problem sounds like dieing back-light tubes or back-light inverter.

      There are several with Dell-LCD experience here.
      Just be patient until one of them finds this.

      .

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        • FIXITNOW
          Senior Member
          • Jun 2008
          • 128
          • UK
          #3
          Re: e153fpb brightness goes down in 2 secs

          check SMD fuse "F1" near the XA connector may be open circuit or high resistance

            Comment

            • LearnStuff
              New Member
              • Jan 2009
              • 3
              #4
              Re: e153fpb brightness goes down in 2 secs

              PCBONEZ and FIXITNOW - thank you for your response. The only fuse F601, I could find, is good. It was marked as T2AH/250V, near the power connector CN601. Are you sure there is an F1 fuse and an XA connector? Any other suggestions please?

                Comment

                • Bobdee
                  Badcaps Veteran
                  • Jun 2008
                  • 461
                  #5
                  Re: e153fpb brightness goes down in 2 secs

                  Go to link
                  https://www.badcaps.net/forum/showth...t=dell+e153fpb

                  you will find fuse=No PF751 page 9 of link

                    Comment

                    • LearnStuff
                      New Member
                      • Jan 2009
                      • 3
                      #6
                      Re: e153fpb brightness goes down in 2 secs

                      Fuse PF751 was tested and found to be good. Thank you Bobdee, the link with schematic helps (how did I miss that - my bad - sorry). I have what I need, to investigate. I will post what I find.

                        Comment

                        • Bobdee
                          Badcaps Veteran
                          • Jun 2008
                          • 461
                          #7
                          Re: e153fpb brightness goes down in 2 secs

                          Welcome Learnstuff
                          Glad to be of assistance

                          QUOTE (I opened the monitor and apparently all components and solder joints look fine)

                          Those Benqs boards are renowned for there bad solder joints,get a good magnifying glass and look for those hair line cracks on solder joints, you wll probably find loads, pay particular attention to inverter transformers there solder joints are suspect and seem to be the cause of the failure of the c5707 or 6s transistors.
                          also double check all solder on all of the transistors on that board, have a quick look at all solder joints

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