HP LP1965 - Power light green, no image

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  • badandy
    Member
    • Nov 2010
    • 25
    • USA

    #1

    HP LP1965 - Power light green, no image

    Hello all, new to the forums here.

    I have a HP LP1965 that has no image.

    When you press the power button the green light turns on.
    The backlights turn on as well. There is no image at all.

    I have pulled the power supply and video boards and all of the
    caps look good. They are a mixture of suscon's and capxons.
    ( i know c823 on the PS looks like its bulging on the top but
    its flat)

    Should I just go ahead and replace them or is there another
    direction that I should take.

    Thanks,

    Andy
    Attached Files
  • jetadm123
    Badcaps Legend
    • Feb 2010
    • 2169

    #2
    Re: HP LP1965 - Power light green, no image

    Is the screen just plain white? If yes, it could be a blown fuse on the LCD control board.

    Comment

    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271

      #3
      Re: HP LP1965 - Power light green, no image

      I agree with jetadm123.
      --- 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

      • badandy
        Member
        • Nov 2010
        • 25
        • USA

        #4
        Re: HP LP1965 - Power light green, no image

        Originally posted by jetadm123
        Is the screen just plain white? If yes, it could be a blown fuse on the LCD control board.
        By white do you mean that it would be the same as a normal functioning monitor displaying white fullscreen?

        OR

        Do you mean white as in the backlights bleeding thru the monitor?

        Comment

        • jetadm123
          Badcaps Legend
          • Feb 2010
          • 2169

          #5
          Re: HP LP1965 - Power light green, no image

          Normal functioning monitor displaying white fullscreen.

          Comment

          • badandy
            Member
            • Nov 2010
            • 25
            • USA

            #6
            Re: HP LP1965 - Power light green, no image

            Its completely dark, if you press the menu button nothing happens. If you press the input button, the backlights turn off for a second or two and then turn back on.

            Comment

            • jetadm123
              Badcaps Legend
              • Feb 2010
              • 2169

              #7
              Re: HP LP1965 - Power light green, no image

              Usually, there's a 5V and 12V output from the power supply. The 12V drives the inverter/backlight section and the 5V drives the logic card and LCD panel. Sounds like the 12V is good, since you're getting backlight.

              Looks like you'll have to piece everything back together to take voltage readings. Measure for the 5V at the wiring harness of the power supply (hopefully, the voltages are silkscreened on the board. Look on top and bottom of board).

              In your photo, I circled what I think are voltage regulators. What are the part numbers?
              Attached Files

              Comment

              • Rtech
                Badcaps Legend
                • Jul 2010
                • 1095

                #8
                Re: HP LP1965 - Power light green, no image

                ""Its completely dark, if you press the menu button nothing happens. If you press the input button, the backlights turn off for a second or two and then turn back on"".
                I am still slightly confused !! from your statement above if the Screen is Dark, then are the Backlights really on ????.....only time the screen is dark normally is if there is NO backlights on ??/

                Comment

                • badandy
                  Member
                  • Nov 2010
                  • 25
                  • USA

                  #9
                  Re: HP LP1965 - Power light green, no image

                  Originally posted by Rtech
                  ""Its completely dark, if you press the menu button nothing happens. If you press the input button, the backlights turn off for a second or two and then turn back on"".
                  I am still slightly confused !! from your statement above if the Screen is Dark, then are the Backlights really on ????.....only time the screen is dark normally is if there is NO backlights on ??/
                  I have powered it on outside the case and I can see that the backlights are on.

                  It looks like when you have your screensaver set to blank the screen but not power off the monitor.

                  Comment

                  • mockingbird
                    Badcaps Legend
                    • Dec 2008
                    • 5484
                    • -

                    #10
                    Re: HP LP1965 - Power light green, no image

                    Change the capacitors. All of them. If the primary capacitor is Capxon, keep it. If it's a Suscon, toss it and replace it too.

                    Comment

                    • badandy
                      Member
                      • Nov 2010
                      • 25
                      • USA

                      #11
                      Re: HP LP1965 - Power light green, no image

                      Mockingbird, do you want me to change caps on both video and power supply boards?

                      Comment

                      • badandy
                        Member
                        • Nov 2010
                        • 25
                        • USA

                        #12
                        Re: HP LP1965 - Power light green, no image

                        Originally posted by jetadm123
                        Usually, there's a 5V and 12V output from the power supply. The 12V drives the inverter/backlight section and the 5V drives the logic card and LCD panel. Sounds like the 12V is good, since you're getting backlight.

                        Looks like you'll have to piece everything back together to take voltage readings. Measure for the 5V at the wiring harness of the power supply (hopefully, the voltages are silkscreened on the board. Look on top and bottom of board).

                        In your photo, I circled what I think are voltage regulators. What are the part numbers?
                        Sorry for the delay getting back to you guys, XMAS has been busy.

                        I tested 3-5 volt legs for voltage, yellow-orange-red are 5v legs, they tested at 5.24 volts each.

                        the part numbers for the regulators are as follows, according to your picture top to bottom

                        AIC1185 top
                        33 PM
                        274IB



                        1187 middle
                        -18PE
                        948D2


                        1185-33PY bottom
                        775IB

                        Comment

                        • mockingbird
                          Badcaps Legend
                          • Dec 2008
                          • 5484
                          • -

                          #13
                          Re: HP LP1965 - Power light green, no image

                          Originally posted by badandy
                          Mockingbird, do you want me to change caps on both video and power supply boards?
                          Yes, the video board too. Especially the larger ones. Be careful not to rip out the pads. It's somewhat difficult with the logic board and the tiny caps. If your soldering skills aren't that great, then just replace the larger ones on the logic board.

                          Comment

                          • jetadm123
                            Badcaps Legend
                            • Feb 2010
                            • 2169

                            #14
                            Re: HP LP1965 - Power light green, no image

                            Originally posted by badandy
                            Sorry for the delay getting back to you guys, XMAS has been busy.

                            I tested 3-5 volt legs for voltage, yellow-orange-red are 5v legs, they tested at 5.24 volts each.

                            the part numbers for the regulators are as follows, according to your picture top to bottom

                            AIC1185 top
                            33 PM
                            274IB



                            1187
                            -18PE
                            948D2


                            1185-33PY bottom
                            775IB


                            Can you please take a voltage reading for each leg of the above devices?

                            Comment

                            • badandy
                              Member
                              • Nov 2010
                              • 25
                              • USA

                              #15
                              Re: HP LP1965 - Power light green, no image

                              Originally posted by jetadm123
                              Can you please take a voltage reading for each leg of the above devices?

                              I took the following readings in circuit assuming that you are looking
                              directly at the IC with the legs facing down. Backlights were not connected lcd was not connected to video board.

                              for AIC1185 33 PM 274IB

                              left leg & center - 5.23vdc
                              right leg & center - 3.29vdc

                              for 1187 -18PE 948D2

                              left leg & center - 3.28vdc
                              right leg & center - 1.802vdc

                              for 1185-33PY 775IB

                              left leg & center - 5.22vdc
                              right leg & center - 3.29vdc

                              Comment

                              • momaka
                                master hoarder
                                • May 2008
                                • 12170
                                • Bulgaria

                                #16
                                Re: HP LP1965 - Power light green, no image

                                Originally posted by badandy
                                for AIC1185 33 PM 274IB

                                left leg & center - 5.23vdc
                                right leg & center - 3.29vdc

                                for 1187 -18PE 948D2

                                left leg & center - 3.28vdc
                                right leg & center - 1.802vdc

                                for 1185-33PY 775IB

                                left leg & center - 5.22vdc
                                right leg & center - 3.29vdc
                                The first and third ICs (1185-33) are 3.3v linear regulators (as indicated by the "33" in the name). The second IC is a 1.8v regulator, so the reading you got for all 3 are good.

                                The problem could also be on the panel board (the one permanently attached to the LCD screen), most likely with one of the boosted voltage rails. If possible, post a few pictures of the panel board. The areas of particular interest are near the LVDS connector and around the inductor/coil.

                                Comment

                                • jetadm123
                                  Badcaps Legend
                                  • Feb 2010
                                  • 2169

                                  #17
                                  Re: HP LP1965 - Power light green, no image

                                  There appears to be 4 fuses, F301-304 on the logic board. Please check them for continuity. I've marked them on the photo.
                                  Attached Files

                                  Comment

                                  • badandy
                                    Member
                                    • Nov 2010
                                    • 25
                                    • USA

                                    #18
                                    Re: HP LP1965 - Power light green, no image

                                    Here is a pic of the panel board.
                                    Attached Files

                                    Comment

                                    • momaka
                                      master hoarder
                                      • May 2008
                                      • 12170
                                      • Bulgaria

                                      #19
                                      Re: HP LP1965 - Power light green, no image

                                      Check the 4 fuses that jetadm123 circled. If they are good, check fuse F5 on the panel board and also measure voltage between ground and the test point labeled "AVDD1". Should be around 10~13v I think. Post back what results you get.

                                      Comment

                                      • badandy
                                        Member
                                        • Nov 2010
                                        • 25
                                        • USA

                                        #20
                                        Re: HP LP1965 - Power light green, no image

                                        Originally posted by jetadm123
                                        There appears to be 4 fuses, F301-304 on the logic board. Please check them for continuity. I've marked them on the photo.
                                        All 4 have continuity.

                                        Comment

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