HP 2159m Dead, no power

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: HP 2159m Dead, no power

    Do you have good pictures of the main board? It can be as simple as bad voltage regulator.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • ckgbmd
      Member
      • Nov 2012
      • 18
      • uSA

      #22
      Re: HP 2159m Dead, no power

      Here they are. Is the voltage regulator on the main board? I thought all that stuff was on the power supply.
      Attached Files

      Comment

      • ckgbmd
        Member
        • Nov 2012
        • 18
        • uSA

        #23
        Re: HP 2159m Dead, no power

        Also, I have measured the voltage across the main cap, it is 164 V, so it seems the power supply is fine. If only I could figure out how to turn it on/off with the pin, then I could test the output voltage to the 750 V DC outs to see if those are working. But for now I guess it seems like the problem is with the main board.

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #24
          Re: HP 2159m Dead, no power

          The Voltage regulators are probably the components with "U" numbers.
          There are 2 3 legged ones and maybe some others. The 8 legged ones maybe regulators but not always.
          You/we need to know what is written on them.

          Read This
          https://www.badcaps.net/forum/showthread.php?p=261329 (by retiredcaps.
          Last edited by selldoor; 11-07-2012, 12:57 PM.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • Mr Bill
            Badcaps Veteran
            • Nov 2011
            • 648
            • USA

            #25
            Re: HP 2159m Dead, no power

            Did you fiddle with the on/off button? I did have 1 monitor that the button was bad. It would turn on but you had to press it several times very hard.

            Comment

            • ckgbmd
              Member
              • Nov 2012
              • 18
              • uSA

              #26
              Re: HP 2159m Dead, no power

              Wow, that is a useful and serious document.

              here's what I've got:

              U201
              MT1117
              3.31002M
              first lead - 0.0 V
              second lead - 1.523 V
              third lead - 5.269 V


              U202
              AX1117
              A-18
              943A
              first lead - 0.0 V
              second lead - 1.805 V
              third lead - 5.081 V


              The best I can tell, these are fixed VRs for 3.3 and 1.8 Volts. the first one appears to be bad? The model lettering is confusing, however, I am not sure I looked at the right data sheet, and I could not find direct correspondence on the data sheet anyway.

              Comment

              • ckgbmd
                Member
                • Nov 2012
                • 18
                • uSA

                #27
                Re: HP 2159m Dead, no power

                MrBill, my 2 year old did that, repeatedly, but I tested the button and it seems to be working fine - when I press it, the leads are shorted.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: HP 2159m Dead, no power

                  U201 IS 3.3 fixed regulator, you only getting 1.523V, so that is bad.
                  U202 is a fixed 1.8V regulator, it is OK.
                  Check or replace that C214 next to it.

                  3.3V fixed:
                  http://www.digikey.com/product-detai...OSCT-ND/660708
                  Last edited by budm; 11-07-2012, 02:04 PM.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #29
                    Re: HP 2159m Dead, no power

                    Originally posted by ckgbmd
                    Wow, that is a useful and serious document.

                    here's what I've got:

                    U201
                    MT1117
                    3.31002M
                    first lead - 0.0 V
                    second lead - 1.523 V
                    third lead - 5.269 V


                    U202
                    AX1117
                    A-18
                    943A
                    first lead - 0.0 V
                    second lead - 1.805 V
                    third lead - 5.081 V


                    The best I can tell, these are fixed VRs for 3.3 and 1.8 Volts. the first one appears to be bad? The model lettering is confusing, however, I am not sure I looked at the right data sheet, and I could not find direct correspondence on the data sheet anyway.
                    I can't see any adjusting resistors so yes ,they are fixed and U201 appears to be bad. I say appears as sometimes it can be a knock on effect from
                    an attached faulty capacitor.
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • ckgbmd
                      Member
                      • Nov 2012
                      • 18
                      • uSA

                      #30
                      Re: HP 2159m Dead, no power

                      Thanks. I am trying to figure out if I can test the capacitor C214 without removing it from the board. If it were shorted I would get low resistance across it right? I get 0.8 kOhm right now. That is probably just from some resistor in parallel with it right? It looks OK? God help me replace that VR, not so quick with a soldering iron, I was really hoping it was a cap somewhere.

                      Comment

                      • retiredcaps
                        Badcaps Legend
                        • Apr 2010
                        • 9271

                        #31
                        Re: HP 2159m Dead, no power

                        Originally posted by ckgbmd
                        God help me replace that VR, not so quick with a soldering iron, I was really hoping it was a cap somewhere.
                        I use a non temperature heat gun on low to remove SMD components. It takes about 30 seconds to remove. I use kapton tape to protect the components around it so they don't get heated.

                        The how to test a voltage regulator thread also points to a video by norcal715 that demos how to remove a voltage regulator with a soldering iron.
                        --- 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

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: HP 2159m Dead, no power

                          It will be easy to remove the old regulator by cutting off the two small legs first, no need to try to save the old bad regulator in one piece, best not to damage the board.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • ckgbmd
                            Member
                            • Nov 2012
                            • 18
                            • uSA

                            #33
                            Re: HP 2159m Dead, no power

                            Thank you all very much for the advice. I ordered several VRs (because I will probably destroy one) and also a replacement capacitor for C214 just in case. That one is a CapXon SJ 105C, 100 uF 16V. I looked up the data sheet to get the ripple current rating, and there was some confusion becuase the 6.3 x 7 mm dimension only goes to 68 uF for a 16V piece. So in the end I ordered this
                            http://www.digikey.com/product-detai...271-ND/1970522
                            which is a Nichicon rated for 5000 hr (excessive, maybe) and with a 163 mA ripple current rating. But, its OK if the ripple current rating is higher than previously, right?

                            Comment

                            • ckgbmd
                              Member
                              • Nov 2012
                              • 18
                              • uSA

                              #34
                              Re: HP 2159m Dead, no power

                              Hello, I managed to replace the VR and now I get the correct voltage. Now the power LED started working. I put it 1/2 way back together and the monitor turns on, shows menus etc. The problem is, the image is fuzzy. tiny green dashes dart horizontaly across the screen. Has anyone run into this problem? I suspect the thin ribbon cable that connects to the flat panel, the connectors are crappy. Or maybe it was my hack soldering job? I am also currently missing a couple of the screws that held the boards in place, need to find those. Any suggestions?

                              Comment

                              • ckgbmd
                                Member
                                • Nov 2012
                                • 18
                                • uSA

                                #35
                                Re: HP 2159m Dead, no power

                                Issue seems to be resolved, mostly:

                                1. I made sure all screws were in place so grounding was properly done.

                                2. The ribbon cable connector on the LCD side was bent, I bent it back. It was really a bad connector. Some HP exec saved some $$$. I am attaching a picture of the connector so others may watch out for it. It is a simple slide-in thing, there is no wedge or lock of any kind, thus it is held on with a piece of tape. The tape in the pic is OEM, not mine.

                                Thank you all for your help.
                                Attached Files

                                Comment

                                • ttt9090
                                  Member
                                  • Apr 2013
                                  • 16
                                  • canada

                                  #36
                                  Re: HP 2159m Dead, no power

                                  ckgbmd, I did one not long ago (different make & model) & experienced similar weirdness when I powered it on at first.
                                  Moved it away from PC and connected it to a laptop & it was fine. Moved it back to PC & connected it & was then fine.
                                  Not sure what caused it, but it's good now.
                                  P.S.
                                  Thanks for the post, I am helping a friend to diagnose same monitor now & I believe this will help him

                                  Comment

                                  • paul112333
                                    New Member
                                    • Jan 2014
                                    • 2
                                    • United Kingdom

                                    #37
                                    Re: HP 2159m Dead, no power

                                    hello, i got almost same problem, monitor hp 2159m , powers up for 2 seconds shows screen and after 2 seconds black screen. maybe someones know how to fix it, i check all capacitors but they all good.

                                    Comment

                                    • selldoor
                                      Slow Learner
                                      • Dec 2010
                                      • 7870

                                      #38
                                      Re: HP 2159m Dead, no power

                                      Picture is just a thumbnail -please post it using manage attachments.
                                      Pic should be less then 2 mb jpg.
                                      You need to read the 2 seconds to black guide by retired caps - click on troubleshooting computer displays at the top of the page - it is a sticky at the front of the forum
                                      Start on post 19

                                      Looking again pic doesnt look clear enought for troubleshooting
                                      it should be straight on and all in focus. One of the back is needed as well
                                      Last edited by selldoor; 01-11-2014, 07:54 AM. Reason: pics
                                      Please upload pictures using attachment function when ask for help on the repair
                                      http://www.badcaps.net/forum/showthread.php?t=39740

                                      Comment

                                      • paul112333
                                        New Member
                                        • Jan 2014
                                        • 2
                                        • United Kingdom

                                        #39
                                        Re: HP 2159m Dead, no power

                                        when display goes off after 2 secs , i can see with flash light screen still shows. looks like backlight problem.

                                        Comment

                                        • selldoor
                                          Slow Learner
                                          • Dec 2010
                                          • 7870

                                          #40
                                          Re: HP 2159m Dead, no power

                                          You might well be right -can you post a good picture of the front and back of the board and I will tell you where to test the inverter transformers. From the tiny pic we have 'it looks different to the boards earlier in the thread
                                          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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