Viewsonic VX2255WMB Grey Screen

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  • tieny
    Badcaps Veteran
    • Feb 2012
    • 478
    • USA
    #1

    Viewsonic VX2255WMB Grey Screen

    Hey I just found an old broken monitor that a friend of mine gave to me awhile ago. I wanted to try to see if it is possible to repair it. I'm new to monitor repairing and I've been reading up on them for the past couple of days. The problem with my monitor is that, I would turn it on and the blue power light turns on. The screen turns on shortly after with a grey screen for 3 seconds and would then shut off and the blue power light turns red.

    I've disassembled the monitor down to the logic board and I've check the capacitors and they seem to look fine (no blown capacitors) so I still do not know the problem. I have very small and basic knowledge of circuits but any help would be appeciated! Thanks

    http://img.photobucket.com/albums/v7...e/DSC09742.jpg
    http://img.photobucket.com/albums/v7...e/DSC09743.jpg
    http://img.photobucket.com/albums/v7...e/DSC09744.jpg
    http://img.photobucket.com/albums/v7...e/DSC09745.jpg
    http://img.photobucket.com/albums/v7...e/DSC09746.jpg

    Heres a couple of pictures, if you need any higher quality photos of anything just ask!
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Viewsonic VX2255WMB Grey Screen

      Attach the pictures using 'Manage Attachments' - below the text entry area.

      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

        • tieny
          Badcaps Veteran
          • Feb 2012
          • 478
          • USA
          #3
          Re: Viewsonic VX2255WMB Grey Screen

          I've been trying to upload them but it keeps giving me, "Your submission could not be processed because a security token was missing."

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: Viewsonic VX2255WMB Grey Screen

              Originally posted by tieny
              I've been trying to upload them but it keeps giving me, "Your submission could not be processed because a security token was missing."
              Follow my sig file instructions below exactly.
              --- begin sig file ---

              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

                • jayoung
                  Senior Member
                  • May 2011
                  • 172
                  #5
                  Re: Viewsonic VX2255WMB Grey Screen

                  Originally posted by PlainBill
                  Attach the pictures using 'Manage Attachments' - below the text entry area.

                  PlainBill
                  attached
                  Attached Files

                    Comment

                    • tieny
                      Badcaps Veteran
                      • Feb 2012
                      • 478
                      • USA
                      #6
                      Re: Viewsonic VX2255WMB Grey Screen

                      Okay i got it, here are higher quality pictures.
                      Attached Files

                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271
                          #7
                          Re: Viewsonic VX2255WMB Grey Screen

                          U7 and U10 are voltage regulators on the main/logic board.

                          Measure all 3 pins (ignore the fat tab). List the part number as well for each regulator. Report it like

                          U7
                          AL1117-33
                          pin 1 = 0.0V DC
                          pin 2 = 3.29V DC
                          pin 3 = 5.01V DC
                          --- begin sig file ---

                          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

                            • tieny
                              Badcaps Veteran
                              • Feb 2012
                              • 478
                              • USA
                              #8
                              Re: Viewsonic VX2255WMB Grey Screen

                              Okay im a bit new at this, but how do i measure the pins, where do i put the probes?

                                Comment

                                • jayoung
                                  Senior Member
                                  • May 2011
                                  • 172
                                  #9
                                  Re: Viewsonic VX2255WMB Grey Screen

                                  Usually black probe on a mounting screw (ground) and the red probe on each pin (leg). Be careful not to "slip" and touch something else while measuring.

                                    Comment

                                    • tieny
                                      Badcaps Veteran
                                      • Feb 2012
                                      • 478
                                      • USA
                                      #10
                                      Re: Viewsonic VX2255WMB Grey Screen

                                      i just noticed that the middle pin of the U7 regulator happens to be unconnected. Is this just how it is designed or would it be the defect?

                                      I took the measurements of U7 and U10

                                      U7
                                      L1117LG-1.8 2A6831A96
                                      pin 1 - 3 i measured 0V for all

                                      U10
                                      50117 K-G 63836
                                      pin 1 = 0V
                                      pin 2 = 0V
                                      pin 3 = 0.014V (and dropping)
                                      Attached Files
                                      Last edited by tieny; 02-08-2012, 08:10 PM.

                                        Comment

                                        • retiredcaps
                                          Badcaps Legend
                                          • Apr 2010
                                          • 9271
                                          #11
                                          Re: Viewsonic VX2255WMB Grey Screen

                                          Originally posted by tieny
                                          i just noticed that the middle pin of the U7 regulator happens to be unconnected. Is this just how it is designed or would it be the defect?
                                          By design.

                                          I took the measurements of U7 and U10

                                          U7
                                          L1117LG-1.8 2A6831A96
                                          pin 1 - 3 i measured 0V for all

                                          U10
                                          50117 K-G 63836
                                          pin 1 = 0V
                                          pin 2 = 0V
                                          pin 3 = 0.014V (and dropping)
                                          Hmm, all 0.0V.

                                          On the power board, measure the DC voltage of each connector pin that connects the power and logic board. Use a ground screw on the power board for your black probe. Report your findings.
                                          --- begin sig file ---

                                          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

                                            • tieny
                                              Badcaps Veteran
                                              • Feb 2012
                                              • 478
                                              • USA
                                              #12
                                              Re: Viewsonic VX2255WMB Grey Screen

                                              I'm I suppose to measure this pins while it is plugged in?

                                                Comment

                                                • retiredcaps
                                                  Badcaps Legend
                                                  • Apr 2010
                                                  • 9271
                                                  #13
                                                  Re: Viewsonic VX2255WMB Grey Screen

                                                  Originally posted by tieny
                                                  I'm I suppose to measure this pins while it is plugged in?
                                                  Did you measure the voltage regulators with power on? It has to be with power on.

                                                  Yes, you need to measure all the pins with power on.
                                                  --- begin sig file ---

                                                  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

                                                    • tieny
                                                      Badcaps Veteran
                                                      • Feb 2012
                                                      • 478
                                                      • USA
                                                      #14
                                                      Re: Viewsonic VX2255WMB Grey Screen

                                                      U10
                                                      L1117LG-1.8 2A6831A96
                                                      pin 1 = 0V
                                                      pin 2 = 1.88V
                                                      pin 3 = 3.3V

                                                      U7
                                                      50117 K-G 63836
                                                      pin 1 = 0V
                                                      pin 2 = 3.3V
                                                      pin 3 = 4.86V

                                                        Comment

                                                        • retiredcaps
                                                          Badcaps Legend
                                                          • Apr 2010
                                                          • 9271
                                                          #15
                                                          Re: Viewsonic VX2255WMB Grey Screen

                                                          Those readings look good. I'm dead tired and exhausted so I may not be thinking clearly, but see if you have 2 seconds to black. It is explained in posts #19 and #20 at

                                                          https://www.badcaps.net/forum/showthread.php?t=10419

                                                          tiredcaps - off to bed
                                                          --- begin sig file ---

                                                          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

                                                            • tieny
                                                              Badcaps Veteran
                                                              • Feb 2012
                                                              • 478
                                                              • USA
                                                              #16
                                                              Re: Viewsonic VX2255WMB Grey Screen

                                                              Funny it seems that I find a post with the same monitor I am working on as of now! So I guess its been worked on before and I found its past history.

                                                              https://www.badcaps.net/forum/showth...ight=VX2255WMB

                                                              https://www.badcaps.net/forum/showth...ight=VX2255WMB

                                                              I don't think i have 2 seconds to black, as i cannot see any images after the white screen shuts off.
                                                              Last edited by tieny; 02-09-2012, 08:10 PM.

                                                                Comment

                                                                • tieny
                                                                  Badcaps Veteran
                                                                  • Feb 2012
                                                                  • 478
                                                                  • USA
                                                                  #17
                                                                  Re: Viewsonic VX2255WMB Grey Screen

                                                                  What should i look for specifically?

                                                                    Comment

                                                                    • PlainBill
                                                                      Badcaps Legend
                                                                      • Feb 2009
                                                                      • 7034
                                                                      • USA
                                                                      #18
                                                                      Re: Viewsonic VX2255WMB Grey Screen

                                                                      Originally posted by tieny
                                                                      What should i look for specifically?
                                                                      Let's verify something from an earlier post. You mentioned a 'White' or 'Gray' screen that went away when the power LED turns red. What happens if it's hooked up to a computer?

                                                                      The problem sounds like a bad connection to the LCD panel, a problem with the panel board (TCON), or a problem with the GPU.

                                                                      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

                                                                        • tieny
                                                                          Badcaps Veteran
                                                                          • Feb 2012
                                                                          • 478
                                                                          • USA
                                                                          #19
                                                                          Re: Viewsonic VX2255WMB Grey Screen

                                                                          I have the sAme results when plugged in my computer. My computer is able to recognize the device (the little usb input sound) but it would not change any symptoms.

                                                                            Comment

                                                                            • selldoor
                                                                              Slow Learner
                                                                              • Dec 2010
                                                                              • 7870
                                                                              #20
                                                                              Re: Viewsonic VX2255WMB Grey Screen

                                                                              Originally posted by retiredcaps
                                                                              By design.



                                                                              Hmm, all 0.0V.

                                                                              On the power board, measure the DC voltage of each connector pin that connects the power and logic board. Use a ground screw on the power board for your black probe. Report your findings.
                                                                              You still need to do this and list findings

                                                                              Also



                                                                              WITH POWER OFF and unplugged for 5 minutes test the secondary windings on the inverter transformer - see post no 20 in the 2 sec to black guide mentioned above.
                                                                              Last edited by selldoor; 02-11-2012, 04:59 PM.
                                                                              Please upload pictures using attachment function when ask for help on the repair
                                                                              http://www.badcaps.net/forum/showthread.php?t=39740

                                                                                Comment

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