Hanns_G HG281D with flashing/blinking screen problems

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  • Barq
    Member
    • Jun 2011
    • 39
    #1

    Hanns_G HG281D with flashing/blinking screen problems

    Hi everyone I have the above monitor and from the beginning of owning it, After starting it I would hear a pop in the back. Now it has started flashing on and off. Its still on and the blue light is on the screen is flashing. So Im thinking BAD CAPS. Also a couple of times I had blinking pixels like sparkles but that ended when I would unplug it and power it on and off to drain it. than it would go away. Please be kind to me I understand elctricity pretty well, (used to be an electrician) but electronics components are not something I have tackled and my skills at soldering should allow me to replace the caps.
    As far as testing I have a multi tester and can, if guided do what testing I need to. If it does sound like caps should a person go use the kits on EBAY? I will include pics of circuitry I have. Thanks in advance for your help/
    Attached Files
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    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Hanns_G HG281D with flashing/blinking screen problems

      We have cases where caps with high ESR on this board cause power problems.

      If your board is similar to this one

      https://www.badcaps.net/forum/attach...2&d=1302978990

      then on the backside (bottom left hand corner in pic) there should be markings for all those voltages.

      List them all and there reported voltages. Note if they are steady or fluctuating.
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        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271
          #3
          Re: Hanns_G HG281D with flashing/blinking screen problems

          Originally posted by Barq
          If it does sound like caps should a person go use the kits on EBAY?
          No. Most sellers on ebay either sell crap or fake caps. Stick with digikey, mouser, or if possible badcaps.net store. These 3 sell quality low ESR caps which are required in a SMPS application.
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            • Barq
              Member
              • Jun 2011
              • 39
              #4
              Re: Hanns_G HG281D with flashing/blinking screen problems

              Originally posted by retiredcaps
              No. Most sellers on ebay either sell crap or fake caps. Stick with digikey, mouser, or if possible badcaps.net store. These 3 sell quality low ESR caps which are required in a SMPS application.
              Thank you for your response it is appeciated. So, does what I have going on sound like caps? I guess I should start with caps and then see how it works? and go from there? The sparkly pixeled screen had me thinking it could be something else as well. Also this started after having a power outage and I ran the comp off of a modified power inverter from battery backup system. Could this have caused the problem?

                Comment

                • Barq
                  Member
                  • Jun 2011
                  • 39
                  #5
                  Re: Hanns_G HG281D with flashing/blinking screen problems

                  oops didnt see the other post above, ill see about the voltages being listed. -- NO VOLTAGES LISTED, Also I note it is a Revision 1 I will have to put it back together and test.
                  Last edited by Barq; 06-12-2011, 12:34 PM.

                    Comment

                    • retiredcaps
                      Badcaps Legend
                      • Apr 2010
                      • 9271
                      #6
                      Re: Hanns_G HG281D with flashing/blinking screen problems

                      Originally posted by Barq
                      I guess I should start with caps and then see how it works? and go from there?
                      Start with the voltage measurements.
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                        • Barq
                          Member
                          • Jun 2011
                          • 39
                          #7
                          Re: Hanns_G HG281D with flashing/blinking screen problems

                          This is what the back looks like not sure which to test.
                          Attached Files

                            Comment

                            • retiredcaps
                              Badcaps Legend
                              • Apr 2010
                              • 9271
                              #8
                              Re: Hanns_G HG281D with flashing/blinking screen problems

                              Your photos of the front are a bit out of focus and not at the correct angle, but most of the connectors (top left in your picture) have a legend.

                              You want to measure the DC voltage of all those pins on all connectors and list them here. For example,

                              CN01

                              pin# - legend - actual measurement
                              pin 1 - 5V SB - 4.95V
                              pin 2 - GND - 0V
                              pin 12 - 12V - 12.05V

                              Use a ground screw for your black probe.

                              If there is no legend, post a clear focused pic of the connectors and mark up the pic with your own numbering scheme and voltage measurement.
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                                • Barq
                                  Member
                                  • Jun 2011
                                  • 39
                                  #9
                                  Re: Hanns_G HG281D with flashing/blinking screen problems

                                  ok a quick question, does it have to have be connected to computer hdmi to test or just turning it on will work?

                                    Comment

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271
                                      #10
                                      Re: Hanns_G HG281D with flashing/blinking screen problems

                                      Originally posted by Barq
                                      does it have to have be connected to computer hdmi to test or just turning it on will work?
                                      It doesn't need to be connected to a computer. Just turn it on.
                                      Last edited by retiredcaps; 06-12-2011, 02:12 PM.
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                                        • Barq
                                          Member
                                          • Jun 2011
                                          • 39
                                          #11
                                          Re: Hanns_G HG281D with flashing/blinking screen problems

                                          heres the thing, It has a cns1 a cns2 and a cns3 jumper. There is nothing connected to cns3 and when I turn it on it has voltage for a second then it drops out as it sees theres no input and the indicator light turns yellow the only pin that has constant voltage is the #5 pin on cns2 it wavers between 5.1 and 5.2 so its hard to read the others

                                            Comment

                                            • retiredcaps
                                              Badcaps Legend
                                              • Apr 2010
                                              • 9271
                                              #12
                                              Re: Hanns_G HG281D with flashing/blinking screen problems

                                              Okay, hookup a computer then and re-measure the voltages.
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                                                • alexanna
                                                  Member
                                                  • Mar 2010
                                                  • 1346
                                                  #13
                                                  Re: Hanns_G HG281D with flashing/blinking screen problems

                                                  Dose this monitor have an inverter that's separate from the P/S?
                                                  If so could you post a picture of the inverter?
                                                  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
                                                      #14
                                                      Re: Hanns_G HG281D with flashing/blinking screen problems

                                                      The way I work is I usually like to have "probable cause" in order to recommend some action. While replacing the caps might fix your lcd, without any hard data, it is a "blind" decision.

                                                      And no I'm not a law enforcement person, but I do watch a lot of Law and Order. :-)

                                                      PS. There are 7 other threads regarding this same lcd and new caps have solved most of the issues.
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                                                        • Barq
                                                          Member
                                                          • Jun 2011
                                                          • 39
                                                          #15
                                                          Re: Hanns_G HG281D with flashing/blinking screen problems

                                                          ok heres the volatages
                                                          Attached Files

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                                                            • Barq
                                                              Member
                                                              • Jun 2011
                                                              • 39
                                                              #16
                                                              Re: Hanns_G HG281D with flashing/blinking screen problems

                                                              Originally posted by alexanna
                                                              Dose this monitor have an inverter that's separate from the P/S?
                                                              If so could you post a picture of the inverter?
                                                              Im not sure there is a long board that goes down the side of the screen could that be it?

                                                                Comment

                                                                • retiredcaps
                                                                  Badcaps Legend
                                                                  • Apr 2010
                                                                  • 9271
                                                                  #17
                                                                  Re: Hanns_G HG281D with flashing/blinking screen problems

                                                                  Originally posted by Barq
                                                                  Im not sure there is a long board that goes down the side of the screen could that be it?
                                                                  Yes.
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                                                                    • Barq
                                                                      Member
                                                                      • Jun 2011
                                                                      • 39
                                                                      #18
                                                                      Re: Hanns_G HG281D with flashing/blinking screen problems

                                                                      Originally posted by retiredcaps
                                                                      Yes.
                                                                      you want a pic of that too? oh duh I see you already said too ok in few ill get it up.
                                                                      Last edited by Barq; 06-12-2011, 03:46 PM.

                                                                        Comment

                                                                        • retiredcaps
                                                                          Badcaps Legend
                                                                          • Apr 2010
                                                                          • 9271
                                                                          #19
                                                                          Re: Hanns_G HG281D with flashing/blinking screen problems

                                                                          Originally posted by Barq
                                                                          you want a pic of that too?
                                                                          Yes, because the inverter board has caps on it and we want to see the condition of the board. Often browning indicates something is running hot or potentially not right.
                                                                          Last edited by retiredcaps; 06-12-2011, 03:51 PM.
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                                                                            • retiredcaps
                                                                              Badcaps Legend
                                                                              • Apr 2010
                                                                              • 9271
                                                                              #20
                                                                              Re: Hanns_G HG281D with flashing/blinking screen problems

                                                                              Originally posted by Barq
                                                                              ok heres the volatages
                                                                              Those voltages look good. One of the 5.1V is probably your standby power (the other 5.1V probably goes to the logic board). The 12V and 24V DC indicate the SMPS is working (otherwise you would not have secondary voltages).

                                                                              Now let's measure the voltage regulators on the logic board. I circled one in red and one in yellow.

                                                                              1) What are the part numbers?
                                                                              2) What is the DC voltage of each pin?

                                                                              Depending on what you find, this may lead to some recommendation as per my post #14.
                                                                              Attached Files
                                                                              Last edited by retiredcaps; 06-12-2011, 04:03 PM.
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