Samsung 930B re-capped, no backlight

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • alexanna
    Member
    • Mar 2010
    • 1346

    #21
    Re: Samsung 930B re-capped, no backlight

    I have a 939B that is not working.
    All the 10mm and smaller caps have been replaced they were obviously swollen. And have been replaced this includes the two 4MM caps.
    U202 and U203 had similar damage as the OP board. And have been replaced.
    I have a power supply that is starting and shutting off repeatedly, the power LED is flashing on and off
    I am currently looking at the DM0565R power switch
    http://pdf1.alldatasheet.com/datashe...SDM0565RB.html
    I have taken some voltage measurements
    Pin 1 is fluctuating between 150 and 160V D.C.
    Pin 2 dose have a ground
    Pin 3 is fluctuating between 9 and 15V D.C.
    Pin 4 which is the feed Back is Fluctuating between .5 And 8 V D.C.
    Pin 5 not used
    Pin 6 is fluctuating between 32V D.C. and 159 V D.C.

    I guess i should have said anybody got any ideas on what to check
    Attached Files
    Last edited by alexanna; 02-08-2011, 02:40 PM. Reason: ideas?
    Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

    Comment

    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271

      #22
      Re: Samsung 930B re-capped, no backlight

      Originally posted by alexanna
      Pin 1 is fluctuating between 150 and 160V D.C.
      Is the DC voltage stable across the main filter capacitor?
      --- 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

      • alexanna
        Member
        • Mar 2010
        • 1346

        #23
        Re: Samsung 930B re-capped, no backlight

        It stays at 160V to 161v the majority of the time, using the min max record it will go as low as 149v briefly at times
        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

        Comment

        • alexanna
          Member
          • Mar 2010
          • 1346

          #24
          Re: Samsung 930B re-capped, no backlight

          The voltage is steady at 163v across the big cap with the logic board unpluged
          Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

          Comment

          • Scenic
            o.O
            • Sep 2007
            • 2640
            • Germany

            #25
            Re: Samsung 930B re-capped, no backlight

            r316 looks pretty toast.. doubt it has something to do with this though..

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271

              #26
              Re: Samsung 930B re-capped, no backlight

              Originally posted by alexanna
              The voltage is steady at 163v across the big cap with the logic board unpluged
              Sounds like something on the logic board is pulling down the power? I had something similar, but never managed to resolve due to a slip of the hand and shorted out some components on the power board.

              I don't have any ideas. Maybe PlainBill does?
              --- 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

              • jetadm123
                Badcaps Legend
                • Feb 2010
                • 2169

                #27
                Re: Samsung 930B re-capped, no backlight

                Originally posted by alexanna
                The voltage is steady at 163v across the big cap with the logic board unpluged

                With the logic board unplugged, do you still have the fluctuating voltages at pins 3 and 6 of the DM0565R?

                Comment

                • alexanna
                  Member
                  • Mar 2010
                  • 1346

                  #28
                  Re: Samsung 930B re-capped, no backlight

                  logic board unpluged
                  Pin 3 steady 10.4v
                  Pin 4 steady .284v, and
                  Pin 6 steady 157.8v
                  Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                  Comment

                  • Mikeley
                    ESR Man
                    • Oct 2010
                    • 41

                    #29
                    Re: Samsung 930B re-capped, no backlight

                    What voltages can you measure on the CN2 connector now??
                    Have you got stable 5V and 13V?

                    Comment

                    • alexanna
                      Member
                      • Mar 2010
                      • 1346

                      #30
                      Re: Samsung 930B re-capped, no backlight

                      I am seeing stable 5.16,and 13.14v without the logic board conected
                      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                      Comment

                      • retiredcaps
                        Badcaps Legend
                        • Apr 2010
                        • 9271

                        #31
                        Re: Samsung 930B re-capped, no backlight

                        Here is an idea which could be completely invalid. Others with more experience can comment on the validity of this idea. Do not try it unless someone else has done it.

                        Instead of using the supplied connector from the power board to the logic board, solder temp wires in place. The idea is to figure out which "rail" is causing the the power board to fluctuate.

                        So maybe start with just soldering in temp wires for ground. Retest for fluctuating voltage. If stable, then add 5V. Retest voltage. Etc, etc. Maybe this will help narrow down the problem?
                        --- 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

                        • jetadm123
                          Badcaps Legend
                          • Feb 2010
                          • 2169

                          #32
                          Re: Samsung 930B re-capped, no backlight

                          I'd like to add on to retiredcaps idea by suggesting the following: If you have a spare 12V automotive tailight bulb, (with the logic board still disconnected) try connecting it across the 13V output of the power supply. It would be interesting to see if any load causes the power supply to shutdown.

                          Comment

                          • PlainBill
                            Badcaps Legend
                            • Feb 2009
                            • 7034
                            • USA

                            #33
                            Re: Samsung 930B re-capped, no backlight

                            These are good suggestions; I'm going to throw my thoughts in here.

                            Possibilities:

                            1. The power supply is unstable with any significant load - suspect the large cap.

                            2. The power supply is reacting to an excessive load generated on the logic card or LCD panel.

                            3. The power supply is reacting to an excessive load generated on the power supply board - the inverter.

                            PlainBill
                            For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                            Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                            Comment

                            • alexanna
                              Member
                              • Mar 2010
                              • 1346

                              #34
                              Re: Samsung 930B re-capped, no backlight

                              I didn't say this in my first post,I never see a on off siginal at the conector from logic to p/s.

                              Yes i have 12v lamp let me see what happens
                              Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                              Comment

                              • retiredcaps
                                Badcaps Legend
                                • Apr 2010
                                • 9271

                                #35
                                Re: Samsung 930B re-capped, no backlight

                                Originally posted by PlainBill
                                1. The power supply is unstable with any significant load - suspect the large cap.
                                Sounds like a good opportunity to raid one off a "junk" board for test purposes.
                                --- 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

                                • alexanna
                                  Member
                                  • Mar 2010
                                  • 1346

                                  #36
                                  Re: Samsung 930B re-capped, no backlight

                                  Originally posted by jetadm123
                                  I'd like to add on to retiredcaps idea by suggesting the following: If you have a spare 12V automotive tailight bulb, (with the logic board still disconnected) try connecting it across the 13V output of the power supply. It would be interesting to see if any load causes the power supply to shutdown.
                                  With the logic board unplugged, the tail lamp of a 1157 bulb will light dimly I am guessing that will be close to 700MA.The turn signal filament will not light.
                                  I have a test light that uses a much smaller bulb and it will light on the 5v and 12v circuits.
                                  Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                  Comment

                                  • Mikeley
                                    ESR Man
                                    • Oct 2010
                                    • 41

                                    #37
                                    Re: Samsung 930B re-capped, no backlight

                                    It is likely to be the 5V rail powering the logic PCB having an excessive load.
                                    But the PSU may also still have a problem with it's feedback circut and the backlight Inverter could have trouble!

                                    First, isolate and eliminate shorts from logic PCB causing the overload condition in the powersupply:
                                    If you have another logic PCB, substitute it. Otherwise, check the 5V and ground wiring back through the connector to the logic board.

                                    Check for shorts by measuring resistance across each of the voltage regulator pins... now I dont have a diagram, but I suspect they are the 3 leg terminal devices circled, one or more of these may be shorted. One produces 1.8V and the other 3.3V?? Measure resistance between each of the terminals.

                                    Second
                                    Looking again at the power board, have the inverter FET's been replaced, U203 looks like the solder has accumulated one one side shorting out one side of the dual FET, could you verify this? Were FET's replaced? And R316 is toast, likely to be open circuit. It appears to be connected to pin 8 of U201 but I can see it clearly from the picture. Anyone have the value of this? 10R or 1R maybe? There is more than one problem to solve. Start with these.

                                    Mike
                                    Attached Files

                                    Comment

                                    • alexanna
                                      Member
                                      • Mar 2010
                                      • 1346

                                      #38
                                      Re: Samsung 930B re-capped, no backlight

                                      I just measured this with the tail lamp filament the draw is 912MA on the 12v rail.
                                      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                      Comment

                                      • alexanna
                                        Member
                                        • Mar 2010
                                        • 1346

                                        #39
                                        Re: Samsung 930B re-capped, no backlight

                                        Originally posted by Mikeley
                                        It is likely to be the 5V rail powering the logic PCB having an excessive load.
                                        But the PSU may also still have a problem with it's feedback circut and the backlight Inverter could have trouble!

                                        First, isolate and eliminate shorts from logic PCB causing the overload condition in the powersupply:
                                        If you have another logic PCB, substitute it. Otherwise, check the 5V and ground wiring back through the connector to the logic board.

                                        Check for shorts by measuring resistance across each of the voltage regulator pins... now I dont have a diagram, but I suspect they are the 3 leg terminal devices circled, one or more of these may be shorted. One produces 1.8V and the other 3.3V?? Measure resistance between each of the terminals.

                                        Second
                                        Looking again at the power board, have the inverter FET's been replaced, U203 looks like the solder has accumulated one one side shorting out one side of the dual FET, could you verify this? Were FET's replaced? And R316 is toast, likely to be open circuit. It appears to be connected to pin 8 of U201 but I can see it clearly from the picture. Anyone have the value of this? 10R or 1R maybe? There is more than one problem to solve. Start with these.

                                        Mike
                                        There are no shorted v regulators
                                        The fets have be replaced, the solder glob is on the drain pins and all of the pins are conected together on the PCB
                                        The logic board is not even asking for backlights,there is no on off siginal
                                        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                        Comment

                                        • jetadm123
                                          Badcaps Legend
                                          • Feb 2010
                                          • 2169

                                          #40
                                          Re: Samsung 930B re-capped, no backlight

                                          Originally posted by alexanna
                                          I just measured this with the tail lamp filament the draw is 912MA on the 12v rail.
                                          Out of curiosity, with the tail lamp connected, are the voltages on pins 3,4 and 6 of the DM0565R still steady?

                                          Comment

                                          Related Topics

                                          Collapse

                                          • Document Archive
                                            Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
                                            by Document Archive
                                            This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                            09-07-2024, 05:50 AM
                                          • Document Archive
                                            Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
                                            by Document Archive
                                            This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                            09-06-2024, 11:40 PM
                                          • Document Archive
                                            Samsung Galaxy Book Ion NP930XCJ Notebook Specification for Upgrade or Repair
                                            by Document Archive
                                            This specification for the Samsung Galaxy Book Ion NP930XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP930XCJ boardview and NP930XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                            09-06-2024, 11:40 PM
                                          • Document Archive
                                            Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
                                            by Document Archive
                                            This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                            09-06-2024, 08:40 PM
                                          • Document Archive
                                            Samsung Galaxy Book Ion NP950XCJ-K01DE Notebook Specification for Upgrade or Repair
                                            by Document Archive
                                            This specification for the Samsung Galaxy Book Ion NP950XCJ-K01DE Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ-K01DE boardview and NP950XCJ-K01DE schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...
                                            09-06-2024, 06:20 PM
                                          • Loading...
                                          • No more items.
                                          Working...