Hanns G HG216D flashing power button

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  • Sparks88
    Senior Member
    • Sep 2011
    • 110

    #1

    Hanns G HG216D flashing power button

    i have the above monitor and after downloading about 20 schematics (various viewsonic) i still havnt found an exact match to the power board, 24 and 5 volt lines are present but the monitor just flashes the power led, there is a ticking noise which seems to be coming from the video card, if i disconnect the power cable from the video board then the monitor powers up with a white screen, i intend to recap the power board as soon as i can get to a supplier which is open after the xmas break, i replaced 2 caps in the power supply a 22uf 50v one and a 10uf 50v one because the originals looked burned and on the positive leg of the i am getting a very high dc voltage (150v) any help would be appreciated.
    Attached Files
  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #2
    Re: Hanns G HG216D flashing power button

    Originally posted by Sparks88
    ion the positive leg of the i am getting a very high dc voltage (150v) any help would be appreciated.
    1) You should be getting around 165V DC on cap C805 and only C805. 150 V DC implies that you are AC is around 106 V (150/1.414) which is pretty low.

    2) There is one voltage regulator on the main board. It is I104.

    a) What is the part number?
    b) What is the DC voltage on each pin?

    3) Some monitors require an input. Hookup a working computer with your favourite wallpaper.

    a) Does the power LED still blink?
    b) If yes, what color?
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    Comment

    • Sparks88
      Senior Member
      • Sep 2011
      • 110

      #3
      Re: Hanns G HG216D flashing power button

      c805 measures 170v dc
      I104 measures 4.69v on one leg, 3.3v on middle and tab, 0v on final, part number is 7585-3.3st

      power led flashes rapidly blue
      no difference with working pc connected

      Comment

      • retiredcaps
        Badcaps Legend
        • Apr 2010
        • 9271

        #4
        Re: Hanns G HG216D flashing power button

        The output voltage is correct for a 7585-3.3st.
        So all your voltages on the power and main board look correct.

        I108 may be your eeprom/flash. If it is corrupt, that might explain the power led flashing blue.

        The only other idea I have right now is what is that 4 pin connector (upper right on the main board) going to?
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        Comment

        • Sparks88
          Senior Member
          • Sep 2011
          • 110

          #5
          Re: Hanns G HG216D flashing power button

          the connector is for the built in speakers
          is there any way to reset the eeprom (i have tried the up/down and power then connect to mains but that doesnt work or as a last resort reprogram it, i have a programmer so i would need the flash file but cannot find anywhere to download it.

          Comment

          • jetadm123
            Badcaps Legend
            • Feb 2010
            • 2169

            #6
            Re: Hanns G HG216D flashing power button

            Can you post a photo of the bottom of the power board? There may be some mosfets there that should be checked.

            Comment

            • Sparks88
              Senior Member
              • Sep 2011
              • 110

              #7
              Re: Hanns G HG216D flashing power button

              power section and inverter reverse side of board
              Attached Files

              Comment

              • jetadm123
                Badcaps Legend
                • Feb 2010
                • 2169

                #8
                Re: Hanns G HG216D flashing power button

                What are the part numbers of the 4 8-pin devices in your 2nd photo?

                Comment

                • Sparks88
                  Senior Member
                  • Sep 2011
                  • 110

                  #9
                  Re: Hanns G HG216D flashing power button

                  the 2 outer ones are stm6920 the 2 inner ones are stm4953, I801 is ld7575ps

                  Comment

                  • jetadm123
                    Badcaps Legend
                    • Feb 2010
                    • 2169

                    #10
                    Re: Hanns G HG216D flashing power button

                    Originally posted by Sparks88
                    the 2 outer ones are stm6920 the 2 inner ones are stm4953, I801 is ld7575ps
                    The 6920 contains 2 n-channel mosfets and the 4953 contains 2 p-channel mosfets. Their datasheets can be found at alldatasheet.com

                    I suggest you try checking them for shorts. With your meter set to resistance, start with:

                    S1-G1
                    G1-D1
                    S1-D1

                    Do the same for:

                    S2-G2
                    G2-D2
                    S2-D2

                    Perform these tests for all 4 chips and post your readings.
                    Last edited by jetadm123; 01-02-2012, 06:59 PM.

                    Comment

                    • Sparks88
                      Senior Member
                      • Sep 2011
                      • 110

                      #11
                      Re: Hanns G HG216D flashing power button

                      all readings are consistently high and no shorts measured across any ic's

                      Comment

                      • jetadm123
                        Badcaps Legend
                        • Feb 2010
                        • 2169

                        #12
                        Re: Hanns G HG216D flashing power button

                        At this point, I don't see recapping the power/inverter board will do any good, since your getting voltage output for the inverter section and the signal/logic card.

                        The problem lies with the signal card. Since you think that there's a ticking sound comming from that card, it might possibly indicate a bad capacitor. Try listening for the sound using a cardboard tube from a roll of paper towels. As another test, use a hair dryer to heat up the caps on the signal card to see if that makes any difference.

                        Comment

                        • alexanna
                          Member
                          • Mar 2010
                          • 1346

                          #13
                          Re: Hanns G HG216D flashing power button

                          Originally posted by Sparks88
                          if i disconnect the power cable from the video board then the monitor powers up with a white screen,
                          In the first post you said with the power cable from the video board disconnected you get a white screen, is that the 30 pin ribbon that goes to the LCD panel?And With that cable disconnected is the PLED still flashing?
                          Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                          Comment

                          • Sparks88
                            Senior Member
                            • Sep 2011
                            • 110

                            #14
                            Re: Hanns G HG216D flashing power button

                            when i disconnect the power board from the logic board i get a white screen, i did not leave it too long as i was worried in case i might damage the inverter/lcd section.
                            Today i took a longer look and the ticking noise is actually coming from the mains input side of the power supply from the area of the optocoupler/main dc cap and if i disconnect the logic board the ticking changes to a very faint buzzing, disconnecting the lcd ribbon does not change anything from the original fault, i have looked over the logic board with a big illuminated magnifier but there isn't anything obvious, i have ordered a esr meter from portugal so when it arrives i will be able to test further as this is turning into a epic battle which i dont want to lose just on principle and i thank everybody for the help they are offering.

                            Comment

                            • PlainBill
                              Badcaps Legend
                              • Feb 2009
                              • 7034
                              • USA

                              #15
                              Re: Hanns G HG216D flashing power button

                              Hello!!!! The input voltage to I104 is very low - 4.69 volts. I would have expected it to be more in the order of 5.1 volts.

                              Using one of the mounting screws as ground, what is the voltage on each pin of the connector to the signal (AKA logic) board?

                              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

                              • retiredcaps
                                Badcaps Legend
                                • Apr 2010
                                • 9271

                                #16
                                Re: Hanns G HG216D flashing power button

                                Originally posted by PlainBill
                                Hello!!!! The input voltage to I104 is very low - 4.69 volts. I would have expected it to be more in the order of 5.1 volts.
                                Hmm, if that is the case, then it is my bad in post #4.

                                The datasheet at



                                suggests than Vin => 4V and Vout is 3.3 V (page 2) are typical.

                                Page 3 says minimum is 2.75V and maximum is 7V so I thought nothing of 4.69V being low.
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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

                                • Sparks88
                                  Senior Member
                                  • Sep 2011
                                  • 110

                                  #17
                                  Re: Hanns G HG216D flashing power button

                                  hi Bill, the numbers on the power board and wire colours are inverted/opposite on the logic board so i am giving you the numbers off the logic board as follows

                                  pin 1 no dc volts but 3.6v ac
                                  pin 2 2.9v dc
                                  pin 3 low voltage pulsing in time with front power led about .8v dc
                                  pin 4 5v dc
                                  pin 5 5v dc
                                  pin 6 0v
                                  pin 7 0v
                                  pin 8 5v dc
                                  pin 9 0v

                                  Comment

                                  • Sparks88
                                    Senior Member
                                    • Sep 2011
                                    • 110

                                    #18
                                    Re: Hanns G HG216D flashing power button

                                    i would like to add that pin 1 on the logic board does not have a connection on the power board, the wire goes across but the connector does not have any form of component or link on the power board

                                    Comment

                                    • PlainBill
                                      Badcaps Legend
                                      • Feb 2009
                                      • 7034
                                      • USA

                                      #19
                                      Re: Hanns G HG216D flashing power button

                                      Originally posted by Sparks88
                                      hi Bill, the numbers on the power board and wire colours are inverted/opposite on the logic board so i am giving you the numbers off the logic board as follows

                                      pin 1 no dc volts but 3.6v ac
                                      pin 2 2.9v dc
                                      pin 3 low voltage pulsing in time with front power led about .8v dc
                                      pin 4 5v dc
                                      pin 5 5v dc
                                      pin 6 0v
                                      pin 7 0v
                                      pin 8 5v dc
                                      pin 9 0v
                                      And I would say that pin 2 is probably the brightness adjust pin for the inverter, while pin 3 is the inverter On / Off control. I note that pins 4,5, and 8 al read 5Vdc, about what I would expect. There is a jumper in place of L803. I would suggest either measuring the voltage on that jumper or lifting one end of it and seeing if the power led stays on.

                                      I would also be curious about the drop from the connector to I104.

                                      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

                                      • Sparks88
                                        Senior Member
                                        • Sep 2011
                                        • 110

                                        #20
                                        Re: Hanns G HG216D flashing power button

                                        jumper l803 measures aound the 26v mark, one thing i am not sure about is the positive leg of c810 measures 122v, this is wrong as the startup ic I801 has a max on vcc of 30v, the 27v zener Z803 has been changed and this doesnt make and difference, the fault probably lies in this area but all the components running that part of the circuit test ok, i will take another look at the 5v feed voltage drop on the logic board.

                                        Comment

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