Dell E153FPB Back Light problem

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  • PlainBill
    Badcaps Legend
    • Feb 2009
    • 7034
    • USA

    #101
    Re: Dell E153FPB Back Light problem

    Originally posted by kenpospeed
    I was wondering if I can use C5707 transistors for the C5706 ones, because the one on my board are C5706
    As far as I know, yes. They are a higher rated version of the C5706.

    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

    • EGuevarae
      Badcaps Legend
      • Nov 2008
      • 1336
      • USA

      #102
      Re: Dell E153FPB Back Light problem

      Originally posted by kenpospeed
      I was wondering if I can use C5707 transistors for the C5706 ones, because the one on my board are C5706
      I have done it (once) and they are still working.
      There are 10 kind of people in this world: those that understand binary, and those who don't.
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      Comment

      • Lazza
        New Member
        • May 2010
        • 2

        #103
        Re: Dell E153FPB Back Light problem

        Hi guys, great site.

        I was given the task by a work mate to find out what was wrong with his Dell E153FPB. (Good mate...I know).

        The symptom was a blank screen with a flashing on/off button. (tripping)

        After looking and testing all electrolytics and fuses on the board, plus resoldering loads of dry joints to no avail, I was a little stumped.
        Having searched google, I came upon this site and was immediately directed to the C5706's.
        Sure enough, 2 of them were dead short. Ordered 4 from ebay and took just 1 day to arrive. Slotted them in and giving the board one final inspection, I put it back together. Low and behold it works a treat.

        Thanks for the information guys.

        I have a little experience with monitors and tv's so i'll be glad to help out where/if I can.

        I think i'll be hanging around this site for quite a while

        Comment

        • johnboy183
          Senior Member
          • May 2008
          • 119

          #104
          Re: Dell E153FPB Back Light problem

          Heres a bit of info that may help in fixing this monitor. I was asked to fix one of these today with the flashing screen and green light. Replaced two of the SC5707s put it all back together and the problem was back!!
          Stripped it back down and the two transistors gone again!
          Just wondering what to do next when I noticed the square grey capacitor between the two transistors was wobbling! Looked with the magnifier to find both of its joints were dry and loose. Resoldered and put in two new transistors and up she ran.
          Still running so hope thats a fix but it shows there are always new answers to old problems.
          Cheers
          Johnboy183

          Comment

          • PlainBill
            Badcaps Legend
            • Feb 2009
            • 7034
            • USA

            #105
            Re: Dell E153FPB Back Light problem

            Originally posted by johnboy183
            Heres a bit of info that may help in fixing this monitor. I was asked to fix one of these today with the flashing screen and green light. Replaced two of the SC5707s put it all back together and the problem was back!!
            Stripped it back down and the two transistors gone again!
            Just wondering what to do next when I noticed the square grey capacitor between the two transistors was wobbling! Looked with the magnifier to find both of its joints were dry and loose. Resoldered and put in two new transistors and up she ran.
            Still running so hope thats a fix but it shows there are always new answers to old problems.
            Cheers
            Johnboy183
            Good job on that one. It seems like the entire production run of Dell E153FPbs are plagued with bad solder joints in the inverter. Another point to pay close attention to is the transformers. Bad solder joints on those are often responsible for shorted transistors.

            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

            • Lazza
              New Member
              • May 2010
              • 2

              #106
              Re: Dell E153FPB Back Light problem

              Originally posted by johnboy183
              Heres a bit of info that may help in fixing this monitor. I was asked to fix one of these today with the flashing screen and green light. Replaced two of the SC5707s put it all back together and the problem was back!!
              Stripped it back down and the two transistors gone again!
              Just wondering what to do next when I noticed the square grey capacitor between the two transistors was wobbling! Looked with the magnifier to find both of its joints were dry and loose. Resoldered and put in two new transistors and up she ran.
              Still running so hope thats a fix but it shows there are always new answers to old problems.
              Cheers
              Johnboy183

              The first thing i noticed when looking at the board was the grey cap loose.
              BTW monitor still running after 3 days, looks like its sorted

              Comment

              • Welchs101
                Badcaps Veteran
                • Sep 2008
                • 979
                • USA

                #107
                Re: Dell E153FPB Back Light problem

                A friend gave me a Dell E153Fpb monitor. It has the same problem that has already been discussed here. The Fuse (PF751) seems to have blown. I measured the transistors (see enclosed pic) and they seem ok but i wanted to get a 2nd opinion on my measurements.

                I used the diode check feature:

                Transistor A:
                Emitter(Red lead)-Base(BLack lead): 0.5V
                Emitter(Red lead)-Collector(BLack lead): 0.183V

                Transistor B same readings as transistor A

                Transistor C:
                Emitter(Red lead)-Base(BLack lead): 0.499V
                Emitter(Red lead)-Collector(BLack lead): 0.182V

                Transistor D same readings as transistor C


                Transistor E and F have markings of J598. Cant find it on the net. So i used resistor measurements between the 3 leads.

                Transistor E:
                Pin1(Red)-Pin2(Black): 7.61Mohm
                Pin1(Red)-Pin3(Black): 25.37Kohm
                Pin1(Red)-Pin2(Black): 0.493Kohm

                Transistor F:
                Pin1(Red)-Pin2(Black): 7.68Mohm
                Pin1(Red)-Pin3(Black): 25.39Kohm
                Pin1(Red)-Pin2(Black): -128Kohm


                I also re-soldered the pins of the inverter transformer.

                I have a spare 2A fast blowing fuse but i didnt want to put it into the board until i was reasonably sure the the mosfets were ok.........

                Do you think if i have resoldered mosfets and transformers that this will fix the problem. Any think else i should do to help prevent fuse from blowing again in the future?
                Attached Files

                Comment

                • Rtech
                  Badcaps Legend
                  • Jul 2010
                  • 1095

                  #108
                  Re: Dell E153FPB Back Light problem

                  I would also check Collector to Base on the four 5706/5707's,and then the associated E and F if necessary.The fuse can fail for no particular reason(maybe age...like me),and I also resolder the transformers, the grey caps behind them and the two coils behind them.

                  Comment

                  • retiredcaps
                    Badcaps Legend
                    • Apr 2010
                    • 9271

                    #109
                    Re: Dell E153FPB Back Light problem

                    Originally posted by Welchs101
                    I used the diode check feature:

                    Transistor A:
                    Emitter(Red lead)-Base(BLack lead): 0.5V
                    Emitter(Red lead)-Collector(BLack lead): 0.183V

                    Transistor B same readings as transistor A

                    Transistor C:
                    Emitter(Red lead)-Base(BLack lead): 0.499V
                    Emitter(Red lead)-Collector(BLack lead): 0.182V

                    Transistor D same readings as transistor C
                    I assume the above measurements are in circuit? I measured a similar working Benq board and I get like readings on the E-C in circuit. I get 0.177V and I know my board works.

                    Transistor F:
                    Pin1(Red)-Pin2(Black): 7.68Mohm
                    Pin1(Red)-Pin3(Black): 25.39Kohm
                    Pin1(Red)-Pin2(Black): -128Kohm
                    Is that a negative 128K ohm reading or a typo?

                    Do you think if i have resoldered mosfets and transformers that this will fix the problem. Any think else i should do to help prevent fuse from blowing again in the future?
                    I think resoldering all the transformer pins and the c5707s and J598 should be all you need.

                    PS. Great clear focused picture.
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                    Comment

                    • Welchs101
                      Badcaps Veteran
                      • Sep 2008
                      • 979
                      • USA

                      #110
                      Re: Dell E153FPB Back Light problem

                      yes it was -128Kohm.........

                      thanks to all for the info!

                      Comment

                      • Welchs101
                        Badcaps Veteran
                        • Sep 2008
                        • 979
                        • USA

                        #111
                        Re: Dell E153FPB Back Light problem

                        i remeasured that wierd reading of -128Kohm and now i get 5MegOhm. So i may have screwed up that measurement somehow.

                        Anyway, thanks.

                        I will solder in the new fuse and let you guys know what happens.....of course i will resolder/reflow the parts you have suggested.

                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271

                          #112
                          Re: Dell E153FPB Back Light problem

                          Originally posted by Welchs101
                          i remeasured that wierd reading of -128Kohm and now i get 5MegOhm. So i may have screwed up that measurement somehow.

                          I will solder in the new fuse and let you guys know what happens.....of course i will resolder/reflow the parts you have suggested.
                          -128K ohm is probably from

                          http://www.flukecommunity.com/forums....php?t-61.html

                          I fixed a Benq board that just had a blown fuse. Of course, I checked all the transistors, etc, but while waiting for the part to come in, I forgot to resolder the transformer pins. After I put in the new fuse, the monitor died 24 hours later with a blown fuse.

                          So I resoldered the transformer pins and put in another fuse and now it works fine.
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                          • Welchs101
                            Badcaps Veteran
                            • Sep 2008
                            • 979
                            • USA

                            #113
                            Re: Dell E153FPB Back Light problem

                            Well, i resoldered all the tranformer pins and the pins of the transistors.

                            I put the new fuse in and its working fine.

                            Bad thing: The only fuse i had was a 3.0A Fast blow fuse. The original fuse was 2.0A. So i will probably have to order the 2.0A fuse but for now it seems to be working.

                            Thanks for the info retiredcaps.

                            Comment

                            • Welchs101
                              Badcaps Veteran
                              • Sep 2008
                              • 979
                              • USA

                              #114
                              Re: Dell E153FPB Back Light problem

                              Just wanted to provide an update on my monitor.......its still working. If for some reason it STOPS i will post an update here.

                              Comment

                              • seh4005
                                New Member
                                • Sep 2010
                                • 1

                                #115
                                Re: Dell E153FPB Back Light problem

                                Originally posted by Bobdee
                                Testing out of circuit with MM set on Diode Check
                                Red probe on B and Black on C, Should read about 600
                                Red probe on B and Black on E, Should read about 600
                                I'm glad this thread is still going; I'm very new to detailed diagnosis with a multimeter. The question I have is a basic one: why should the transistors read about 600? I assume it is because 600 is the measurement that C5706's are rated to read, however I can't find that information online -- if I were to come across transistors in the future how could I figure out what number they should read?

                                B to C: ~493
                                B to E: ~531

                                This is the reading I get for all 4 transistors. This means the transistors are bad. Am I correct in this assumption?

                                Thank you

                                Comment

                                • retiredcaps
                                  Badcaps Legend
                                  • Apr 2010
                                  • 9271

                                  #116
                                  Re: Dell E153FPB Back Light problem

                                  Originally posted by seh4005
                                  why should the transistors read about 600?

                                  B to C: ~493
                                  B to E: ~531

                                  This is the reading I get for all 4 transistors. This means the transistors are bad. Am I correct in this assumption?
                                  600 means nothing without the actual unit. When using a diode test function, the unit is volts.

                                  It is 0.600 volts or 600 mV (millivolts). A diode should test in the range of 0.4 to 0.7V. So your diodes are good.
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                                  • retiredcaps
                                    Badcaps Legend
                                    • Apr 2010
                                    • 9271

                                    #117
                                    Re: Dell E153FPB Back Light problem

                                    Sorry, I meant your transistors are good.

                                    I normally test transistors for shorts by using the ohm functionality versus the diode test.

                                    I test 1-2, 1-3, and 2-3 "in circuit". If any show less than 50 ohms, I suspect they are bad. Then I retest out of circuit to verify.
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                                    • PlainBill
                                      Badcaps Legend
                                      • Feb 2009
                                      • 7034
                                      • USA

                                      #118
                                      Re: Dell E153FPB Back Light problem

                                      The situation is even murkier than retiredcaps suggests. The exact operation of the diode test varies from DMM to DMM. The big variation is in the current applied. A guideline I use is that if both transistors in a pair give similar readings, while both in the other pair give radically different readings, one pair is bad. Since ther are two more or less identical circuits, if all four read the same (and are not shorted), they are probably good.

                                      Usually, it is very clear-cut, especially in this circuit. The Royer oscillator design depends upon two good transistors. If either fails the other will usually be destroyed, unless the fuse blows first.

                                      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

                                      • pb64x
                                        New Member
                                        • Sep 2010
                                        • 1

                                        #119
                                        Re: Dell E153FPB Back Light problem

                                        Hi All,
                                        I've a Samsung SyncMaster 701N LCD monitor, the problem is that when I plug it the green light is blinking, but the screen stays black, no backlight and no image.
                                        I've checked the voltage output on the power-inverter board and I've found 5.5Vcc and 16.5Vcc.
                                        Boards models are:
                                        - power/inverter = IP-35135A, MT2-17 Rev0.4 2006.02.13
                                        - video card = MJ17AS KBN94-00689C Normal Ver:1.2EK

                                        So, the problem could be the video card, or the backlight bulb, or the LCD ?

                                        Thanks !!

                                        Comment

                                        • retiredcaps
                                          Badcaps Legend
                                          • Apr 2010
                                          • 9271

                                          #120
                                          Re: Dell E153FPB Back Light problem

                                          Originally posted by pb64x
                                          Hi All,
                                          I've a Samsung SyncMaster 701N LCD monitor
                                          Start a new thread since you have a different monitor.

                                          1) Post clear focused pictures of your boards after reading

                                          https://www.badcaps.net/forum/showthread.php?t=1868

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