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    #1

    HP f1703 Monitor

    Powers on fine. Only displays VGA image for a second then turns off. Indicates there is no signal being received. Everything appears to ok on the graphics board.

    Now on the power board....

    I have noticed some bad solder joints on the choke coils and a bulging cap.

    Resistance on all caps on the board are the same (without removing)


    The worst thing is that I have a 19" HP which is doing the exact same thing!

    Any assistance will be greatly appreciated. Thank you in advance.
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    #2
    Re: HP f1703 Monitor

    The cap in picture 2 is definitely bulging. Replace that.

    I'm the last person that should talking about soldering, but it looks like the solder joint just above D207 has a line fracture. A good solder joint should like the one right of D207. The left most solder joint (next to the word CONN) also looks like it has a split crater.

    I think that yellow/brown stuff my be flux and not cleaned off? Someone else can verify or dispute?

    Originally posted by zylcho
    Powers on fine. Only displays VGA image for a second then turns off. Indicates there is no signal being received. Everything appears to ok on the graphics board.

    Now on the power board....

    I have noticed some bad solder joints on the choke coils and a bulging cap.

    Resistance on all caps on the board are the same (without removing)


    The worst thing is that I have a 19" HP which is doing the exact same thing!

    Any assistance will be greatly appreciated. Thank you in advance.
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      #3
      Re: HP f1703 Monitor

      Just saw this at

      http://www.lcdmonitorrepairebook.com/

      6) HP 15 inches fl503 (AOC OEM)

      Fault diagnosis: Dark screen after switch on lcd monitor.

      Fault location: Found the dry joints on inductors L201 on high voltage inverter board. (This high voltage inverter board has three inductors have the same dry joints).

      Originally posted by zylcho
      P
      I have noticed some bad solder joints on the choke coils and a bulging cap.
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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

        #4
        Re: HP f1703 Monitor

        VIOLA! That was it! Thank you for your time and consideration!

        Now as far as the bulging cap, all the caps on the board have same value in uf and voltage. When I checked resistance, they were all within a few thousands of each other. Does this mean that is is "showing bad", but will eventually go?

        Once again thank you!

        Comment

          #5
          Re: HP f1703 Monitor

          What was "it"? Please clarify so we know what fixed "it"?

          How did you test the caps? With an ESR tester? or DMM with the caps unsoldered? What exact reading did you get for resistance?

          Originally posted by zylcho
          VIOLA! That was it! Thank you for your time and consideration!

          Now as far as the bulging cap, all the caps on the board have same value in uf and voltage. When I checked resistance, they were all within a few thousands of each other. Does this mean that is is "showing bad", but will eventually go?

          Once again thank you!
          --- 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.

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          Comment

            #6
            Re: HP f1703 Monitor

            It was the those bad solder joints on the "L" coils. The board had 5 on it but only 3 had those crappy joints. Heated and reapplied.

            I have a Fluke 16 DMM and was getting 1.651 on the K scale, with cap still on board.


            Thanks!

            Comment

              #7
              Re: HP f1703 Monitor

              Glad it is working. One down, one to go!

              Originally posted by zylcho
              It was the those bad solder joints on the "L" coils. The board had 5 on it but only 3 had those crappy joints. Heated and reapplied.

              I have a Fluke 16 DMM and was getting 1.651 on the K scale, with cap still on board.


              Thanks!
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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.

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

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              Comment

                #8
                Re: HP f1703 Monitor

                Do replace that cap, if it's bulging, it has already failed. Piece of mind for a small amount of change that you won't have to open it anytime soon.

                Comment

                  #9
                  Re: HP f1703 Monitor

                  Originally posted by zylcho
                  I have a Fluke 16 DMM and was getting 1.651 on the K scale, with cap still on board.
                  You can only use a DMM to see if the caps a shorted, but you can't test them if they have high ESR or not. For that you need an ESR meter.
                  What brand and series are the caps anyways? The one in pic 2 does look a bit bulged. If it is, then it's probably a good idea to replace all caps from that brand.

                  Comment

                    #10
                    Re: HP f1703 Monitor

                    Originally posted by retiredcaps
                    Just saw this at

                    http://www.lcdmonitorrepairebook.com/

                    6) HP 15 inches fl503 (AOC OEM)

                    Fault diagnosis: Dark screen after switch on lcd monitor.

                    Fault location: Found the dry joints on inductors L201 on high voltage inverter board. (This high voltage inverter board has three inductors have the same dry joints).
                    That is a very nice site and the free ebook is good ..I was reading the tips section and posted the link on this forum as it may help others as it did me.

                    Comment

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