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    Dell E153FPB Screen Flashes

    Hello All,

    I have a Dell E153FPB monitor, that has a problem. When you plug the power cord in, the screen will not power on. Instead, the back light and green power light will breifly flash. This problem started a few days ago, and I'm not sure of the cause. The monitor is connected to a power strip which is unplugged when the computer is not in use; so I am sure that it has not been caused by a power surge.

    I thought the monitor was toast, so I left it unplugged for at least a day. When I plugged it in last night just to 'try it out', it turned on as normal and functioned correctly. When I turned the monitor on this morning, the Windows splash screen appeared, but then the monitor started flashing again.

    I attached a video of the monitor that I took on my cellphone, which might help.. (I zipped it because .WMVs are not allowed to be attached)

    I have looked at the previous topic, and am not entirely sure if this problem applies to my monitor...

    http : //www.badcaps . net/forum/showthread.php?t=3360


    I just wanted to get a 'professional' opinion before I swapped out the fuse, which was the solution in the previous topic.

    Thanks in Advanced,

    ilikemycomputer
    Attached Files

    #2
    Re: Dell E153FPB Screen Flashes

    Originally posted by ilikemycomputer
    Hello All,

    I have a Dell E153FPB monitor, that has a problem. When you plug the power cord in, the screen will not power on. Instead, the back light and green power light will breifly flash. This problem started a few days ago, and I'm not sure of the cause. The monitor is connected to a power strip which is unplugged when the computer is not in use; so I am sure that it has not been caused by a power surge.

    I thought the monitor was toast, so I left it unplugged for at least a day. When I plugged it in last night just to 'try it out', it turned on as normal and functioned correctly. When I turned the monitor on this morning, the Windows splash screen appeared, but then the monitor started flashing again.

    I attached a video of the monitor that I took on my cellphone, which might help.. (I zipped it because .WMVs are not allowed to be attached)

    I have looked at the previous topic, and am not entirely sure if this problem applies to my monitor...

    http : //www.badcaps . net/forum/showthread.php?t=3360


    I just wanted to get a 'professional' opinion before I swapped out the fuse, which was the solution in the previous topic.

    Thanks in Advanced,

    ilikemycomputer
    Those symptoms indicate a shorted transistor in the inverter, NOT a fuse. I indicated the transistors to check in the other thread. Check them.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment


      #3
      Re: Dell E153FPB Screen Flashes

      Those symptoms indicate a shorted transistor in the inverter, NOT a fuse. I indicated the transistors to check in the other thread. Check them.
      Thanks for the post. I checked those transistors; all of them seemed to be fine. I checked a few more and found one that was acting weird. I highlighted it in green in the picture I attached; when I touched second pin and third pin (or the first pin) with the ohmmeter, the voltage shot up, and then it displayed '1', so I assume this is the shorted transistor that is giving me problems. Or is this pin not used....? All of the other transistors displayed a voltage in the 600s and were pretty similar.


      Thanks Again,

      ilikemycomputer
      Attached Files

      Comment


        #4
        Re: Dell E153FPB Screen Flashes

        Originally posted by ilikemycomputer
        Thanks for the post. I checked those transistors; all of them seemed to be fine. I checked a few more and found one that was acting weird. I highlighted it in green in the picture I attached; when I touched second pin and third pin (or the first pin) with the ohmmeter, the voltage shot up, and then it displayed '1', so I assume this is the shorted transistor that is giving me problems. Or is this pin not used....? All of the other transistors displayed a voltage in the 600s and were pretty similar.


        Thanks Again,

        ilikemycomputer
        That transistor is a FET. It switches the power to Q759 and Q760. Q743 performs the same function for Q739 and Q740. These are the drivers for the transformers. Even if it were shorted, it wouldn't cause this problem.

        Let's see if we can figure this out. The symptoms are of a power supply that is shutting down because the output current is too high. It EXACTLY matches the symptoms I had with a Dell E173FPb. The question is if your problem is the power supply, the logic board / LCD panel, or the inverter / CCFL.

        Unsolder one end of PF751. That provides power to the inverter. Then try the monitor again. You won't be able to see anything, but if the power LED stays on, the load from the inverter is causing it to shut down.

        PlainBill
        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment


          #5
          Re: Dell E153FPB Screen Flashes

          I unsoldered one side of the PF751, and it did exactly as you stated. The power light remained lit, and the back light was off. Does this mean the inverter needs to be replaced, or just a transistor?

          Thanks again for all of your help,

          ilikemycomputer

          Comment


            #6
            Re: Dell E153FPB Screen Flashes

            Originally posted by ilikemycomputer
            I unsoldered one side of the PF751, and it did exactly as you stated. The power light remained lit, and the back light was off. Does this mean the inverter needs to be replaced, or just a transistor?
            That remains to be seen. Let's see if we can figure it out. Since it isn't a transistor, let's see if there is something funky about the rest of the inverter. The first step will be to resolder all the pins on the transformers I had outlined in blue on the picture. Then replace the fuse and try it.

            If it still fails, try unsoldering Q743 and seeing if the backlights come on for a few seconds (they may be dimmer than normal). If the power LED flashes, go to step 3. If the power LED stays on, but the backlight goes off after a few seconds, replace Q743 and remove Q751. Try it again. If the power LED stays on, but the backlight goes off after a few seconds, the inverter is probably good.

            Step 3 Leave Q743 out and also remove Q751 and try again. If the power LED still flashes, you probably have a bad power supply.

            If the Power LED flashes only when Q743 is inserted, there is a problem with the inverter or CCFL on that side. If it flashes only when Q751 is inserted, the problem is on that side. To eliminate the CCFLs, swap the leads at the connector.

            One point I would like to make. Unless you have very little room for a monitor, it probably is not cost effective to spend a lot of money trying to repair this. ($5.00 in parts would probably worth in.) 15" monitors are definitely 'yesterday'. Rather, pick up a dead 17" or 19" monitor from Freecycle or Craigslist and fix that. The 15" may be better as a parts donor or test jig.

            Originally posted by ilikemycomputer
            Thanks again for all of your help,

            ilikemycomputer
            Just wait until you have to pay it forward.

            PlainBill
            For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

            Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

            Comment


              #7
              Re: Dell E153FPB Screen Flashes

              Originally posted by PlainBill

              Just wait until you have to pay it forward.

              PlainBill
              There are 10 kind of people in this world: those that understand binary, and those who don't.
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              Comment


                #8
                Re: Dell E153FPB Screen Flashes

                Ok, I unsoldered Q743. The power light remained green but the back-lights did not turn on at all. The results were no different when Q743 was in, and when it was out. Should I try removing Q751?

                Thanks again,

                ilikemycomputer

                Comment


                  #9
                  Re: Dell E153FPB Screen Flashes

                  Originally posted by ilikemycomputer
                  Ok, I unsoldered Q743. The power light remained green but the back-lights did not turn on at all. The results were no different when Q743 was in, and when it was out. Should I try removing Q751?

                  Thanks again,

                  ilikemycomputer
                  Ah, you DID resolder PF751, correct?

                  PlainBill
                  For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                  Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                  Comment


                    #10
                    Re: Dell E153FPB Screen Flashes

                    Alright, I resoldered PF571, (I don't know how I missed that ) The back light turned on for afew seconds and shut off,the power light remained lit. I'll buy a new transistor online, and post back the results when I receive it and solder it in.

                    Thanks Again!

                    ilikemycomputer

                    Comment


                      #11
                      Re: Dell E153FPB Screen Flashes

                      Originally posted by ilikemycomputer
                      Alright, I resoldered PF571, (I don't know how I missed that ) The back light turned on for afew seconds and shut off,the power light remained lit. I'll buy a new transistor online, and post back the results when I receive it and solder it in.

                      Thanks Again!

                      ilikemycomputer
                      NO!! No!! No!! All you have done is prove that that section of the inverter may be overloading the power supply. It is almost certainly not the FET; it could be one of the bipolar transistors on that side, the transformer, a bad cap, possibly a bad CCFL, or even a power supply problem. Now replace Q743, remove Q751, and see if the power LED flashes. If it does, the problem is on the side switched by Q743. If it does not, and the backlights behave the same way they did as reported above, it could be a power supply problem.

                      PlainBill
                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                      Comment


                        #12
                        Re: Dell E153FPB Screen Flashes

                        One point I would like to make. Unless you have very little room for a monitor, it probably is not cost effective to spend a lot of money trying to repair this. ($5.00 in parts would probably worth in.) 15" monitors are definitely 'yesterday'. Rather, pick up a dead 17" or 19" monitor from Freecycle or Craigslist and fix that. The 15" may be better as a parts donor or test jig.
                        Well, I came up to the conclusion that I will probably just purchase a new monitor, rather than put money and time into my outdated one. Thanks again for all of your help.

                        ilikemycomputer

                        Comment


                          #13
                          Re: Dell E153FPB Screen Flashes

                          Originally posted by ilikemycomputer
                          Well, I came up to the conclusion that I will probably just purchase a new monitor, rather than put money and time into my outdated one. Thanks again for all of your help.

                          ilikemycomputer
                          What would you do with your unit if you don't fix it?
                          There are 10 kind of people in this world: those that understand binary, and those who don't.
                          • ASUS ROG Maximus IX Code
                          • Intel Core i5-7600K 3.8GHz
                          • 16gb GSKILL TridentZ RGB DDR4-3200
                          • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                          • Windows 10 Pro x64
                          • GeForce GT1050
                            2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                          Comment


                            #14
                            Re: Dell E153FPB Screen Flashes

                            What would you do with your unit if you don't fix it?
                            I repair computers on the side, so I will just keep it for parts.


                            I thought about it, and I'm going to give it one more shot. I really want to get this monitor working again...

                            Comment


                              #15
                              Re: Dell E153FPB Screen Flashes

                              Originally posted by PlainBill View Post
                              Those symptoms indicate a shorted transistor in the inverter, NOT a fuse. I indicated the transistors to check in the other thread. Check them.

                              PlainBill
                              I have the same monitor the power led stays on display comes up for a few seconds then shut off
                              What u thing hinder it to stay power up
                              I was suggesting its bad cap.

                              Comment


                                #16
                                Re: Dell E153FPB Screen Flashes

                                Originally posted by andrepalmer View Post
                                I have the same monitor the power led stays on display comes up for a few seconds then shut off
                                What u thing hinder it to stay power up
                                I was suggesting its bad cap.
                                Could be many things - you need to read this guide by retiredcaps.
                                https://www.badcaps.net/forum/showthread.php?t=10419

                                Start at post19
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment


                                  #17
                                  Re: Dell E153FPB Screen Flashes

                                  Originally posted by selldoor View Post
                                  Could be many things - you need to read this guide by retiredcaps.
                                  https://www.badcaps.net/forum/showthread.php?t=10419

                                  Start at post19
                                  Yes selldoor. Good advice. And when he gets to the inverter section he's going to find a shorted C5707 most likely. (circled in red)
                                  We can go all through the diagnostics like they had to do earlier in this thread. But this is a variation of the BENQ board. We know these boards all too well by now. I checked online and found a cheap repair kit that handles international orders (Jamaica).
                                  http://www.ebay.com/itm/REPAIR-KIT-2...item3355ff711b

                                  You need to replace the 4 transistors circled in red. The 2 fets circled in green. Check or replace the fuse circled in blue. And resolder the pins from the inverter transformers circled in blue. That should fix you. Good luck.
                                  Attached Files

                                  Comment

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