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Re: [Laptop_Repair] HP ze motherboard power test

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  • Ardell Faul
    The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter. The
    Message 1 of 10 , Oct 29, 2006
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      The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

      Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
      Ardell Faul
      Computer Monitor Service Inc.
      Laptop Computer & Monitor Repair
      10816 E. Mission Ave.,
      Spokane Valley, Wa.  99206
      ardell@...
      509-891-5188


      Starmaxpc wrote:

      ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

      Ardell Faul <ardell@icehouse. net> wrote:

      You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
      Ardell Faul  Computer
       Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net  509-891-5188


      Starmaxpc wrote:
      What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

      The best gets better. See why everyone is raving about the All-new Yahoo! Mail.

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  • Starmaxpc
    ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power
    Message 2 of 10 , Nov 1, 2006
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      ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power though. connected cpu and heatsink/fan. applied ac connection and tried to power on. no lights no fan. to test at the fuse point im unsure. exactly where would the fuse be located? HP pavilion ZE4100 series motherboard. thanks.

      Ardell Faul <ardell@...> wrote:
      The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

      Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
      Ardell Faul  Computer Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net  509-891-5188


      Starmaxpc wrote:
      ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

      Ardell Faul <ardell@icehouse. net> wrote:
      You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
      Ardell Faul  Computer   Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net  509-891-5188


      Starmaxpc wrote:
      What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

      The best gets better. See why everyone is raving about the All-new Yahoo! Mail.

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    • Russ Blakeman
      Fuse is usually marked as an F component on the board, generally near the DC in jack and on the positive line from the jack - some have a fuse on both negative
      Message 3 of 10 , Nov 1, 2006
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        Fuse is usually marked as an F component on the board, generally near the DC in jack and on the positive line from the jack - some have a fuse on both negative and positive. It will likely be a surface mount chip fuse.
         
        Once found check the side away from the DC jack for power (with the adapter on and plugged in of course). If the fuse is blown there will be DC on the side nearest the jack and not on the side away from it as it's internally open. If good you'll see voltage on both sides. If the side nearest the jack has no power it means a break in the printed circuit or they failed to solder the jack on properly.
         
        I have to assume that you know you have a good voltage and current level from the adapter?
         
         
        -----Original Message-----
        From: Laptop_Repair@yahoogroups.com [mailto:Laptop_Repair@yahoogroups.com]On Behalf Of Starmaxpc
        Sent: Wednesday, November 01, 2006 12:01 PM
        To: Laptop_Repair@yahoogroups.com
        Cc: ardell@...
        Subject: Re: [Laptop_Repair] HP ze motherboard power test

        ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power though. connected cpu and heatsink/fan. applied ac connection and tried to power on. no lights no fan. to test at the fuse point im unsure. exactly where would the fuse be located? HP pavilion ZE4100 series motherboard. thanks.

        Ardell Faul <ardell@icehouse. net> wrote:

        The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

        Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
        Ardell Faul  Computer Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net  509-891-5188


        Starmaxpc wrote:
        ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

        Ardell Faul <ardell@icehouse. net> wrote:
        You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
        Ardell Faul  Computer   Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net  509-891-5188


        Starmaxpc wrote:
        What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

        The best gets better. See why everyone is raving about the All-new Yahoo! Mail.

        No virus found n this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.17/505 - Release Date: 10/27/2006


        All new Yahoo! Mail -
        Get a sneak peak at messages with a handy reading pane.

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      • Starmaxpc
        top or bottom? would you happen to have a pic relating to this style fuse? thanks. Russ Blakeman wrote: Fuse is usually
        Message 4 of 10 , Nov 1, 2006
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          top or bottom? would you happen to have a pic relating to this style fuse? thanks.

          Russ Blakeman <rhb57@...> wrote:
          Fuse is usually marked as an F component on the board, generally near the DC in jack and on the positive line from the jack - some have a fuse on both negative and positive. It will likely be a surface mount chip fuse.
           
          Once found check the side away from the DC jack for power (with the adapter on and plugged in of course). If the fuse is blown there will be DC on the side nearest the jack and not on the side away from it as it's internally open. If good you'll see voltage on both sides. If the side nearest the jack has no power it means a break in the printed circuit or they failed to solder the jack on properly.
           
          I have to assume that you know you have a good voltage and current level from the adapter?
           
           
          -----Original Message-----
          From: Laptop_Repair@ yahoogroups. com [mailto:Laptop_ Repair@yahoogrou ps.com]On Behalf Of Starmaxpc
          Sent: Wednesday, November 01, 2006 12:01 PM
          To: Laptop_Repair@ yahoogroups. com
          Cc: ardell@icehouse. net
          Subject: Re: [Laptop_Repair] HP ze motherboard power test

          ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power though. connected cpu and heatsink/fan. applied ac connection and tried to power on. no lights no fan. to test at the fuse point im unsure. exactly where would the fuse be located? HP pavilion ZE4100 series motherboard. thanks.

          Ardell Faul <ardell@icehouse. net> wrote:
          The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

          Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
          Ardell Faul  Computer Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net 
           509-891-5188


          Starmaxpc wrote:
          ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

          Ardell Faul <ardell@icehouse. net> wrote:
          You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
          Ardell Faul  Computer   Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa. 
           99206  ardell@icehouse. net  509-891-5188


          Starmaxpc wrote:
          What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

          The best gets better. See why everyone is raving about the All-new Yahoo! Mail.

          No virus found n this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.17/505 - Release Date: 10/27/2006


          All new Yahoo! Mail -
          Get a sneak peak at messages with a handy reading pane.

          No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.17/505 - Release Date: 10/27/2006


          All new Yahoo! Mail -
          Get a sneak peak at messages with a handy reading pane.


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        • Russ Blakeman
          The fuse would be on the component side (usually) and I was speaking in general not specifics as I don t have a ZE series board to look at. You need to sit
          Message 5 of 10 , Nov 2, 2006
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            The fuse would be on the component side (usually) and I was speaking in general not specifics as I don't have a ZE series board to look at. You need to sit down with a magnifier and start looking at the screen printed component designations on the traces from the center lead of the DC input onto the board. The fuse will look much the same as all the other rectangular chip capacitors and resistors on the board and too small usually for a marking.
             
             
            -----Original Message-----
            From: Laptop_Repair@yahoogroups.com [mailto:Laptop_Repair@yahoogroups.com]On Behalf Of Starmaxpc
            Sent: Wednesday, November 01, 2006 6:10 PM
            To: Laptop_Repair@yahoogroups.com
            Subject: RE: [Laptop_Repair] HP ze motherboard power test

            top or bottom? would you happen to have a pic relating to this style fuse? thanks.

            Russ Blakeman <rhb57@windstream. net> wrote:

            Fuse is usually marked as an F component on the board, generally near the DC in jack and on the positive line from the jack - some have a fuse on both negative and positive. It will likely be a surface mount chip fuse.
             
            Once found check the side away from the DC jack for power (with the adapter on and plugged in of course). If the fuse is blown there will be DC on the side nearest the jack and not on the side away from it as it's internally open. If good you'll see voltage on both sides. If the side nearest the jack has no power it means a break in the printed circuit or they failed to solder the jack on properly.
             
            I have to assume that you know you have a good voltage and current level from the adapter?
             
             
            -----Original Message-----
            From: Laptop_Repair@ yahoogroups. com [mailto:Laptop_ Repair@yahoogrou ps.com]On Behalf Of Starmaxpc
            Sent: Wednesday, November 01, 2006 12:01 PM
            To: Laptop_Repair@ yahoogroups. com
            Cc: ardell@icehouse. net
            Subject: Re: [Laptop_Repair] HP ze motherboard power test

            ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power though. connected cpu and heatsink/fan. applied ac connection and tried to power on. no lights no fan. to test at the fuse point im unsure. exactly where would the fuse be located? HP pavilion ZE4100 series motherboard. thanks.

            Ardell Faul <ardell@icehouse. net> wrote:
            The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

            Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
            Ardell Faul  Computer Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net 
             509-891-5188


            Starmaxpc wrote:
            ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

            Ardell Faul <ardell@icehouse. net> wrote:
            You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
            Ardell Faul  Computer   Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa. 
             99206  ardell@icehouse. net  509-891-5188


            Starmaxpc wrote:
            What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

            The best gets better. See why everyone is raving about the All-new Yahoo! Mail.

            No virus found n this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.17/505 - Release Date: 10/27/2006


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            Get a sneak peak at messages with a handy reading pane.

            No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.17/505 - Release Date: 10/27/2006


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          • Starmaxpc
            problem solved. the new dc connection inside tip was slightly smaller than the old one so the old ac adapter was loose on connection hence no power supplied. i
            Message 6 of 10 , Nov 3, 2006
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              problem solved. the new dc connection inside tip was slightly smaller than the old one so the old ac adapter was loose on connection hence no power supplied. i got a new adapter with the correct size barrel and laptop is now functioning 100%. Go figure?? i remember you asking if i had the correct voltage from ac adapter and yes i did at 19.7 volts so that confused me as to why i wasnt getting power. Thanks Russ and Ardell for your time.

              Russ Blakeman <rhb57@...> wrote:
              The fuse would be on the component side (usually) and I was speaking in general not specifics as I don't have a ZE series board to look at. You need to sit down with a magnifier and start looking at the screen printed component designations on the traces from the center lead of the DC input onto the board. The fuse will look much the same as all the other rectangular chip capacitors and resistors on the board and too small usually for a marking.
               
               
              -----Original Message-----
              From: Laptop_Repair@ yahoogroups. com [mailto:Laptop_ Repair@yahoogrou ps.com]On Behalf Of Starmaxpc
              Sent: Wednesday, November 01, 2006 6:10 PM
              To: Laptop_Repair@ yahoogroups. com
              Subject: RE: [Laptop_Repair] HP ze motherboard power test

              top or bottom? would you happen to have a pic relating to this style fuse? thanks.

              Russ Blakeman <rhb57@windstream. net> wrote:
              Fuse is usually marked as an F component on the board, generally near the DC in jack and on the positive line from the jack - some have a fuse on both negative and positive. It will likely be a surface mount chip fuse.
               
              Once found check the side away from the DC jack for power (with the adapter on and plugged in of course). If the fuse is blown there will be DC on the side nearest the jack and not on the side away from it as it's internally open. If good you'll see voltage on both sides. If the side nearest the jack has no power it means a break in the printed circuit or they failed to solder the jack on properly.
               
              I have to assume that you know you have a good voltage and current level from the adapter?
               
               
              -----Original Message-----
              From: Laptop_Repair@ yahoogroups. com [mailto:Laptop_ Repair@yahoogrou ps.com]On Behalf Of Starmaxpc
              Sent: Wednesday, November 01, 2006 12:01 PM
              To: Laptop_Repair@ yahoogroups. com
              Cc: ardell@icehouse. net
              Subject: Re: [Laptop_Repair] HP ze motherboard power test

              ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power though. connected cpu and heatsink/fan. applied ac connection and tried to power on. no lights no fan. to test at the fuse point im unsure. exactly where would the fuse be located? HP pavilion ZE4100 series motherboard. thanks.

              Ardell Faul <ardell@icehouse. net> wrote:
              The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

              Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
              Ardell Faul  Computer Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net    509-891-5188


              Starmaxpc wrote:
              ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

              Ardell Faul <ardell@icehouse. net> wrote:
              You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
              Ardell Faul  Computer   Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.    99206  ardell@icehouse. net  509-891-5188


              Starmaxpc wrote:
              What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

              The best gets better. See why everyone is raving about the All-new Yahoo! Mail.

              No virus found n this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.17/505 - Release Date: 10/27/2006


              All new Yahoo! Mail -
              Get a sneak peak at messages with a handy reading pane.

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              Get a sneak peak at messages with a handy reading pane.


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            • Russ Blakeman
              Not a problem...that was why I mentioned checking for power at the solder points, in case something like a bas solder joint or this occurred although unless I
              Message 7 of 10 , Nov 4, 2006
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                Not a problem...that was why I mentioned checking for power at the solder points, in case something like a bas solder joint or this occurred although unless I had the machine on my bench I probably would have never thought of a bad center pin diamter.
                -----Original Message-----
                From: Laptop_Repair@yahoogroups.com [mailto:Laptop_Repair@yahoogroups.com]On Behalf Of Starmaxpc
                Sent: Friday, November 03, 2006 8:40 AM
                To: Laptop_Repair@yahoogroups.com
                Subject: RE: [Laptop_Repair] HP ze motherboard power test

                problem solved. the new dc connection inside tip was slightly smaller than the old one so the old ac adapter was loose on connection hence no power supplied. i got a new adapter with the correct size barrel and laptop is now functioning 100%. Go figure?? i remember you asking if i had the correct voltage from ac adapter and yes i did at 19.7 volts so that confused me as to why i wasnt getting power. Thanks Russ and Ardell for your time.

                Russ Blakeman <rhb57@windstream. net> wrote:

                The fuse would be on the component side (usually) and I was speaking in general not specifics as I don't have a ZE series board to look at. You need to sit down with a magnifier and start looking at the screen printed component designations on the traces from the center lead of the DC input onto the board. The fuse will look much the same as all the other rectangular chip capacitors and resistors on the board and too small usually for a marking.
                 
                 
                -----Original Message-----
                From: Laptop_Repair@ yahoogroups. com [mailto:Laptop_ Repair@yahoogrou ps.com]On Behalf Of Starmaxpc
                Sent: Wednesday, November 01, 2006 6:10 PM
                To: Laptop_Repair@ yahoogroups. com
                Subject: RE: [Laptop_Repair] HP ze motherboard power test

                top or bottom? would you happen to have a pic relating to this style fuse? thanks.

                Russ Blakeman <rhb57@windstream. net> wrote:
                Fuse is usually marked as an F component on the board, generally near the DC in jack and on the positive line from the jack - some have a fuse on both negative and positive. It will likely be a surface mount chip fuse.
                 
                Once found check the side away from the DC jack for power (with the adapter on and plugged in of course). If the fuse is blown there will be DC on the side nearest the jack and not on the side away from it as it's internally open. If good you'll see voltage on both sides. If the side nearest the jack has no power it means a break in the printed circuit or they failed to solder the jack on properly.
                 
                I have to assume that you know you have a good voltage and current level from the adapter?
                 
                 
                -----Original Message-----
                From: Laptop_Repair@ yahoogroups. com [mailto:Laptop_ Repair@yahoogrou ps.com]On Behalf Of Starmaxpc
                Sent: Wednesday, November 01, 2006 12:01 PM
                To: Laptop_Repair@ yahoogroups. com
                Cc: ardell@icehouse. net
                Subject: Re: [Laptop_Repair] HP ze motherboard power test

                ok. new dc connector applied. top and bottom. the place where i purchased the connector the tech there applied it. he offered to do so. i still have no power though. connected cpu and heatsink/fan. applied ac connection and tried to power on. no lights no fan. to test at the fuse point im unsure. exactly where would the fuse be located? HP pavilion ZE4100 series motherboard. thanks.

                Ardell Faul <ardell@icehouse. net> wrote:
                The only way the amperage of the inverter will make any difference is if the laptop is drawing the full capacity (not likely) of the wall adapter.  The amperage rating just means that the inverter can maintain its rated output voltage, probably 19.6 volts, at any current draw between Zero amps and what ever it is rated at.  If there is no load on the charger, it is putting out 19.6 volts at Zero amps.  If there is a full load, it will be putting out 19.6 volts at 3.16 amps, or whatever it is rated at.  If the load demands more current from this point on, the voltage will start to drop, or the unit will sense this and shut down.

                Are you able to measure the full voltage at the fuse on the motherboard with respect to any ground point on the board?  Did you solder both the top and bottom side of the board where the jack mounts?  Are there any signs of overheating on the board where the jack was loose?  Sometimes this will cause charring and the layers of the board will short out.  These motherboard are not simply constructed with the traces you see on the top and bottom of the board.  There are traces running around INSIDE the thickness of the board, probably 4 or 5 layers of them.  The inner traces get connected to the top and bottom traces bia little "Clyinders" that are plated into the hole.  If you pulled one of these cylinders out when you removed the jack, you have disconnected the inner traces and the board will never work again unless you can figure out another point to hard wire a connection to. 
                Ardell Faul  Computer Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.  99206  ardell@icehouse. net    509-891-5188


                Starmaxpc wrote:
                ok tried that. didnt notice anything. fan, lights, etc. i have the proper power ac adapter which is 19 volts. would it be the amperage of the ac adapter that makes a difference or is that only for battery charge. thanks.

                Ardell Faul <ardell@icehouse. net> wrote:
                You should be able to do this safely, PROVIDED you screw the heat sink and cooling assembly on the CPU first.  If you plug the unit in and turn it on without the heat sink, you might damage the CPU. 
                Ardell Faul  Computer   Monitor Service Inc.  Laptop Computer & Monitor Repair  10816 E. Mission Ave.,  Spokane Valley, Wa.    99206  ardell@icehouse. net  509-891-5188


                Starmaxpc wrote:
                What is the easiest way to test a laptop motherboard that is just the board only. i had to strip a laptop apart to re solder the dc connection and would just like to power on and make sure it does light up eg. fan, battery, before putting it all back together. am i able to plug adapter in and test that way? Thanks.

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