Dell SP2008WFPt no picture

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  • kynax
    Member
    • Sep 2010
    • 33
    #1

    Dell SP2008WFPt no picture

    I have a used Dell SP2008WFPt 20 inches monitor with USB hub and webcam that doesn't work anymore.

    When I plug it in, the power button light blinks blue, but pressing it doesn't do anything.

    I disassembled it and took pictures of the two boards. I tested the power supply board (yellow-ish one) with my multimeter and the +5V points do indeed output 5 volts when the power cable is plugged in.

    On the other board, I haven't tested the points because I don't know what any of it does. I did look at all the capacitors and they all seem fine to me.

    Tools I have access to: soldering iron, digital multimeter


    I've attached a few pictures. If they are unclear or if close shots of particular areas are required, I can add some more. I do have access to a flatbed scanner, but since there are some fairly high components, I don't think the picture would be any good.

    I uploaded the full resolution pictures on imgur: http://imgur.com/a/CUTze
    Attached Files
    Tags: None
    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Dell SP2008WFPt no picture

      Originally posted by kynax
      When I plug it in, the power button light blinks blue, but pressing it doesn't do anything.
      If you hookup a working computer with your favourite wall paper, do you see it by shining a flashlight on the lcd?
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        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271
          #3
          Re: Dell SP2008WFPt no picture

          There are voltage regulators on the logic board. I have circled them in yellow.

          Use a ground screw on the logic board for the black probe. Put your multimeter on 20V DC (if manual).

          1) What are the part numbers of each regulator?

          2) What is the DC voltage of each pin?
          Attached Files
          Last edited by retiredcaps; 03-07-2011, 11:08 PM.
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          We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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            Comment

            • jetadm123
              Badcaps Legend
              • Feb 2010
              • 2169
              #4
              Re: Dell SP2008WFPt no picture

              Is there a legend silk screened next to the wiring harness on the power board identifying voltages, ena, on/off, etc?

                Comment

                • kynax
                  Member
                  • Sep 2010
                  • 33
                  #5
                  Re: Dell SP2008WFPt no picture

                  Originally posted by jetadm123
                  Is there a legend silk screened next to the wiring harness on the power board identifying voltages, ena, on/off, etc?
                  Yes, you can see it in the 6th picture. If you check the imgur files, the resolution is high enough to see it.

                  The picture is upside-down, but the order is:

                  OFF | BRI | ON-OFF | A-EN | A-DET | GND (4) | +5V- RTN | 5V (4)


                  I already checked that the 4 5V pins do have 5V compared to the 4 GND pins.

                    Comment

                    • kynax
                      Member
                      • Sep 2010
                      • 33
                      #6
                      Re: Dell SP2008WFPt no picture

                      Originally posted by retiredcaps
                      If you hookup a working computer with your favourite wall paper, do you see it by shining a flashlight on the lcd?
                      No, nothing at all.

                        Comment

                        • kynax
                          Member
                          • Sep 2010
                          • 33
                          #7
                          Re: Dell SP2008WFPt no picture

                          Originally posted by retiredcaps
                          There are voltage regulators on the logic board. I have circled them in yellow.

                          Use a ground screw on the logic board for the black probe. Put your multimeter on 20V DC (if manual).

                          1) What are the part numbers of each regulator?

                          2) What is the DC voltage of each pin?
                          Here are the readings I get:
                          Attached Files

                            Comment

                            • retiredcaps
                              Badcaps Legend
                              • Apr 2010
                              • 9271
                              #8
                              Re: Dell SP2008WFPt no picture

                              Originally posted by kynax
                              Here are the readings I get:
                              Those readings look good.

                              I missed one voltage regulator. Report and measure I317 (just above chip labeled 3B72).

                              For the future, one good clear focused picture top down view of each board is sufficient. Having the logic board chopped up in 4 quadrants is difficult to view.
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                              If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                              We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                              Please do not post inline and offsite as they slow down the loading of pages.

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                                Comment

                                • jetadm123
                                  Badcaps Legend
                                  • Feb 2010
                                  • 2169
                                  #9
                                  Re: Dell SP2008WFPt no picture

                                  Originally posted by kynax
                                  Yes, you can see it in the 6th picture. If you check the imgur files, the resolution is high enough to see it.

                                  The picture is upside-down, but the order is:

                                  OFF | BRI | ON-OFF | A-EN | A-DET | GND (4) | +5V- RTN | 5V (4)


                                  I already checked that the 4 5V pins do have 5V compared to the 4 GND pins.

                                  Many members here avoid (myself included) photos posted on external sites for fear of catching a virus on their computer.

                                  Can you please measure the voltages of BRI,ON-OFF,A-EN and A-DET?

                                  Also, it looks like you missed a voltage reg (circled in yellow). Measure and report the voltages and part number. There seems to be a number of fuses (circled in red). Check them for continuity. Check around the board for additional fuses. They are generally marked FXXX (XXX=number).
                                  Attached Files

                                    Comment

                                    • kynax
                                      Member
                                      • Sep 2010
                                      • 33
                                      #10
                                      Re: Dell SP2008WFPt no picture

                                      Originally posted by retiredcaps
                                      Those readings look good.

                                      I missed one voltage regulator. Report and measure I317 (just above chip labeled 3B72).

                                      For the future, one good clear focused picture top down view of each board is sufficient. Having the logic board chopped up in 4 quadrants is difficult to view.
                                      I don't get anything on any of the pins.
                                      It's a 17-33L like the other one.


                                      One thing I did notice with the VGA cable plugged into my laptop is that Windows does recognize the monitor:
                                      Attached Files

                                        Comment

                                        • kynax
                                          Member
                                          • Sep 2010
                                          • 33
                                          #11
                                          Re: Dell SP2008WFPt no picture

                                          Originally posted by jetadm123
                                          Can you please measure the voltages of BRI,ON-OFF,A-EN and A-DET?
                                          BRI: oscillates between 0 and 2.7V every 0.5 seconds
                                          ON-OFF: 0.12V
                                          A-EN: 0.12V
                                          A-DET: 0V

                                            Comment

                                            • jetadm123
                                              Badcaps Legend
                                              • Feb 2010
                                              • 2169
                                              #12
                                              Re: Dell SP2008WFPt no picture

                                              Originally posted by kynax
                                              BRI: oscillates between 0 and 2.7V every 0.5 seconds
                                              ON-OFF: 0.12V
                                              A-EN: 0.12V
                                              A-DET: 0V


                                              What about the fuses I asked you to check?

                                                Comment

                                                • kynax
                                                  Member
                                                  • Sep 2010
                                                  • 33
                                                  #13
                                                  Re: Dell SP2008WFPt no picture

                                                  Originally posted by jetadm123
                                                  There seems to be a number of fuses (circled in red). Check them for continuity. Check around the board for additional fuses. They are generally marked FXXX (XXX=number).
                                                  I tested all I could find (over 15) and they all worked fine (continuity).

                                                    Comment

                                                    • retiredcaps
                                                      Badcaps Legend
                                                      • Apr 2010
                                                      • 9271
                                                      #14
                                                      Re: Dell SP2008WFPt no picture

                                                      Originally posted by kynax
                                                      I don't get anything on any of the pins.
                                                      It's a 17-33L like the other one.
                                                      Assuming the fuses around that component are all working, then this voltage regulator is bad. You should get some DC voltage readings on the pins.
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                                                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                                      Please do not post inline and offsite as they slow down the loading of pages.

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                                                        Comment

                                                        • jetadm123
                                                          Badcaps Legend
                                                          • Feb 2010
                                                          • 2169
                                                          #15
                                                          Re: Dell SP2008WFPt no picture

                                                          Originally posted by kynax
                                                          I don't get anything on any of the pins.
                                                          It's a 17-33L like the other one.


                                                          One thing I did notice with the VGA cable plugged into my laptop is that Windows does recognize the monitor:

                                                          You should have at least 5V on one of the pins. I would have suspected a bad fuse.

                                                            Comment

                                                            • kynax
                                                              Member
                                                              • Sep 2010
                                                              • 33
                                                              #16
                                                              Re: Dell SP2008WFPt no picture

                                                              Originally posted by retiredcaps
                                                              Assuming the fuses around that component are all working, then this voltage regulator is bad. You should get some DC voltage readings on the pins.
                                                              Is this a component that fails fairly often? As in, is there a good chance that this is the problem?

                                                              I'm pretty sure I can buy a replacement locally and change it.

                                                                Comment

                                                                • jetadm123
                                                                  Badcaps Legend
                                                                  • Feb 2010
                                                                  • 2169
                                                                  #17
                                                                  Re: Dell SP2008WFPt no picture

                                                                  Regardless of whether it's bad or not, you should still measure the 5V input.

                                                                    Comment

                                                                    • retiredcaps
                                                                      Badcaps Legend
                                                                      • Apr 2010
                                                                      • 9271
                                                                      #18
                                                                      Re: Dell SP2008WFPt no picture

                                                                      Originally posted by kynax
                                                                      Is this a component that fails fairly often?
                                                                      Voltage regulators do fail. How often? I don't know.

                                                                      You can look for replacements on junk boards and reuse the old ones.

                                                                      PS. You should retest it one more time.
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                                                                      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                                                      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                                                      Please do not post inline and offsite as they slow down the loading of pages.

                                                                      --- end sig file ---

                                                                        Comment

                                                                        • kynax
                                                                          Member
                                                                          • Sep 2010
                                                                          • 33
                                                                          #19
                                                                          Re: Dell SP2008WFPt no picture

                                                                          Originally posted by jetadm123
                                                                          Regardless of whether it's bad or not, you should still measure the 5V input.
                                                                          Indeed, I misread your previous post.

                                                                          Which one is the input pin?

                                                                            Comment

                                                                            • kynax
                                                                              Member
                                                                              • Sep 2010
                                                                              • 33
                                                                              #20
                                                                              Re: Dell SP2008WFPt no picture

                                                                              Originally posted by retiredcaps

                                                                              PS. You should retest it one more time.
                                                                              That's also what I though.

                                                                              I still get 0V on all pins.

                                                                              I compared with the other regulator and that one is still working.


                                                                              EDIT: Is is possible that this regulator is there for the USB hub, in which nothing is plugged right now, explaining the lack of voltage in there?

                                                                                Comment

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