Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]

Announcement

Collapse
No announcement yet.

HP LCD 2009F No Power

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    HP LCD 2009F No Power

    I have I unit hp 2009f lcd and suddently no power, i diagnose the power board and all capacitor are ok, fuse also ok, and i have no idea where to diagnose next.

    hope you all can help me
    Tags: None
    #2
    Re: HP LCD 2009F No Power

    1) Does the power LED light come on at all?

    2) Post clear focused top down view pictures of all your boards following my sig file below EXACTLY?

    3) Here is an example of the picture composition that we want.

    https://www.badcaps.net/forum/showpo...94&postcount=1
    --- 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

      #3
      Re: HP LCD 2009F No Power

      1) The LED light off - No power activity

      2) No 1 on the picture is like transistor - A2764A1 927050 cannot find the datasheet
      Attached Files

      Comment

        #4
        Re: HP LCD 2009F No Power

        Originally posted by armand666 View Post
        1) The LED light off - No power activity
        1) Please post a picture of the main board as well.

        2) On the connector from the power board to the main board, are there any DC voltages present on those colored cables? If yes, list them all with their color or pin number. At least one of them should be 5V DC.
        Last edited by retiredcaps; 03-12-2012, 10:21 PM.
        --- 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

          #5
          Re: HP LCD 2009F No Power

          Any DC on that large 450VDC cap? There should be at least 300VDC on that cap.
          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

            #6
            Re: HP LCD 2009F No Power

            Originally posted by budm View Post
            Any DC on that large 450VDC cap? There should be at least 300VDC on that cap.
            On large 450DC cap shows 329.5 volt

            Comment

              #7
              Re: HP LCD 2009F No Power

              Originally posted by retiredcaps View Post
              1) Please post a picture of the main board as well.

              2) On the connector from the power board to the main board, are there any DC voltages present on those colored cables? If yes, list them all with their color or pin number. At least one of them should be 5V DC.
              Connector from the powerboard,

              1. red - no dc power
              2. red - no dc power
              3. black
              4. black
              5. blue - no dc power
              6. yellow - no dc power
              7. green - no dc power
              8. dark blue - no dc power
              9. yellow - no dc power
              10. green - no dc power

              Comment

                #8
                Re: HP LCD 2009F No Power

                1) My guess is that the small capacitor to the left (as per your upside down picture) of D852 is the startup capacitor.

                a) What is the uF and V of that cap?
                b) What is the DC voltage across the cap?

                2) My guess is that the SMPS IC sits on that little vertical board just north of the startup cap. It might be a 8 pin IC.

                a) If so, what is the part number of that IC?
                Last edited by retiredcaps; 03-19-2012, 02:29 AM.
                --- 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

                  #9
                  Re: HP LCD 2009F No Power

                  Originally posted by retiredcaps View Post
                  1) My guess is that the small capacitor to the left (as per your upside down picture) of D852 is the startup capacitor.

                  a) What is the uF and V of that cap?
                  b) What is the DC voltage across the cap?

                  2) My guess is that the SMPS IC sits on that little vertical board just north of the startup cap. It might be a 8 pin IC.

                  a) If so, what is the part number of that IC?
                  1.
                  a) caps 10uf 50v
                  b) no voltage

                  2.
                  a) 8 pin IC LD7575PS

                  Comment

                    #10
                    Re: HP LCD 2009F No Power

                    Refer to page 2 of the datasheet at

                    http://pdf1.alldatasheet.com/datashe.../LD7575PS.html

                    1) Pin 8 is HV. Pin 4 is GND. Pin 6 is VCC.

                    2) What is the DC voltage at pin 8 using pin 4 as GND?

                    3) What is the DC voltage at pin 6 using pin 4 as GND?

                    4) What is the resistance of R852?
                    a) What markings are on that component?
                    --- 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

                      #11
                      Re: HP LCD 2009F No Power

                      My monitor also could not power ON 2 days ago. Yesterday, I managed to confirm Power Transistor A2764A1 abnormal. However, could not find datasheet for this part.

                      Comment

                        #12
                        Re: HP LCD 2009F No Power

                        Might be a AP2764 mosfet.

                        Comment

                          #13
                          Re: HP LCD 2009F No Power

                          Sir whats the possible problem of this kind of trouble.

                          Comment

                            #14
                            Re: HP LCD 2009F No Power

                            Hp 2009f LCD no power. Cause by sudden brownout, after it came back of power from main outlet. Theres no power at all of the LCD. Pls give me your answer. Tnx

                            Comment

                              #15
                              Re: HP LCD 2009F No Power

                              Originally posted by zanexx99 View Post
                              Hp 2009f LCD no power. Cause by sudden brownout, after it came back of power from main outlet. Theres no power at all of the LCD. Pls give me your answer. Tnx
                              Sometimes these are as easy as replacing the main fuse on the power board.
                              With power off, check the main fuse with the ohm setting. It should have very low ohms if its good.
                              If the fuse is good you need to check for voltage at big filter cap. With power on ****Be careful*** you check for DC voltage on the 2 legs of that big main capacitor. I like to steady my elbows on the bench so the probes don't slip. It should have a very high voltage. 300+ volts DC.

                              Comment

                                #16
                                Re: HP LCD 2009F No Power

                                Originally posted by retiredcaps View Post
                                Refer to page 2 of the datasheet at

                                http://pdf1.alldatasheet.com/datashe.../LD7575PS.html

                                1) Pin 8 is HV. Pin 4 is GND. Pin 6 is VCC.

                                2) What is the DC voltage at pin 8 using pin 4 as GND?

                                3) What is the DC voltage at pin 6 using pin 4 as GND?

                                4) What is the resistance of R852?
                                a) What markings are on that component?
                                I replace the ic LD7575PS but still no power, and also replace 2764A1 also no power

                                Comment

                                  #17
                                  Re: HP LCD 2009F No Power

                                  Can you Trace

                                  this Area. of D587.

                                  Possible Shorted...

                                  Comment

                                  Previous template Next
                                  Working...
                                  X