Hanns-G HG281D, LCD Monitor no power

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • tito_hydra
    New Member
    • Jun 2016
    • 1
    • Brazil

    #821
    Re: Hanns-G HG281D, LCD Monitor no power

    Originally posted by momaka
    There websites might have something for you:

    badcaps.net store
    https://www.badcaps.net/index.php?pageid=master_list
    (international shipping is stated as $9.50

    RS components:
    http://it.rs-online.com/web/

    Farnell/element14
    http://www.farnell.com/

    or you can also contact member behemot on this forum (he's based in CZ, Europe)
    @momaka, I am gonna start the recap of this monitor, i want to change all of the capacitors.
    Since i do not have an ESR meter, can you help me to get a full list of the capacitors names? With all the boards on this monitor?
    Sorry for bother you, also sorry my bad english.

    Comment

    • SturmGhost
      New Member
      • Aug 2013
      • 9
      • Germany

      #822
      Re: Hanns-G HG281D, LCD Monitor no power

      I think I have an issue with my monitor (HG281D).

      Sometimes (happens more often when the monitors runs a longer time) when I scroll down a website some horizontal "artifacts"/distortion appears at 4/5 height of the panel height.
      It can't be a computer problem because I build a new one and the problem is still there. A year ago I changed C80 and C83 because of weird on/off behavior of my monitor (it fixed the on/off behavior).

      Does anybody have an idea how to fix my monitor?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #823
        Re: Hanns-G HG281D, LCD Monitor no power

        Did you use use good quality caps for the C80, 83?
        How about the caps in the power supply board?
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • SturmGhost
          New Member
          • Aug 2013
          • 9
          • Germany

          #824
          Re: Hanns-G HG281D, LCD Monitor no power

          Not sure but I think I used:

          "RAD FR 100/50 Elko radial, 105°C, low ESR, RM 3,5mm" Brand: Panasonic

          Which caps should I replace on the power supply board?

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #825
            Re: Hanns-G HG281D, LCD Monitor no power

            OK, you did use PANASONIC FR series.
            I would do the recap of the whole power supply board, you may not need to do the main filter cap in the primary side.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • N_R_G
              New Member
              • May 2016
              • 9
              • Italy

              #826
              Re: Hanns-G HG281D, LCD Monitor no power

              Originally posted by SturmGhost
              Which caps should I replace on the power supply board?
              Most of times (99%) just replace the three marked in red... Other times It could be necessary replace also the caps marked in blue...

              https://www.badcaps.net/forum/attach...8&d=1435812326
              Last edited by N_R_G; 06-22-2016, 11:01 AM.

              Comment

              • momaka
                master hoarder
                • May 2008
                • 12160
                • Bulgaria

                #827
                Re: Hanns-G HG281D, LCD Monitor no power

                Originally posted by tito_hydra
                @momaka, I am gonna start the recap of this monitor, i want to change all of the capacitors.
                Since i do not have an ESR meter, can you help me to get a full list of the capacitors names? With all the boards on this monitor?
                For the list of capacitors regarding the PSM217-404 power board, see this:
                https://www.badcaps.net/forum/attach...2&d=1341463821

                Then, use any of the capacitors from the following list:
                https://www.badcaps.net/forum/showpo...22&postcount=9

                Also get the two capacitors on the LCD logic board, like mentioned here:
                https://www.badcaps.net/forum/showpo...&postcount=629

                Comment

                • james2323
                  New Member
                  • Dec 2015
                  • 1
                  • USA

                  #828
                  Re: Hanns-G HG281D, LCD Monitor no power

                  Originally posted by PlainBill
                  When you hook the power supply to an AC voltage only one output will be 'live' - the 5 volt standby (+5VSB) pin on the 11 pin connector at the end of the supply. If that shows 5 volts, unplug the power cord, hook up the signal card, and check the PSON pin and recheck the +5VSB pin on the same connector. Given the symptoms, I'd expect PSON to be low.

                  PlainBill
                  Through reading this very through and informative thread, i have replaced many of the Caps on my HG281D Power supply board (ive replaced about 18 caps on the PS board, the ones most commonly suggested/listed here to be replaced).

                  When i try to test the +5VSB as described above by PlainBill, (with only the AC main plugged to the power supply board, nothing else) all 11 pins read the same, they all constantly fluctuate between ~ -.13 v dc and ~ +.30v dc (to verify, the way I take this reading: i set my multi-meter to 20v DC and touch the black lead to the ground point coming from the AC IN on the monitor frame (that short green cable that is screwed to the monitor's metal frame) , and this is the reading i get.)

                  The symptoms that lead me to even open up this monitor (and replace the caps) were that it would flash / power itself off after about 1-60 seconds (i could press the power button several times, sometimes, and get it to repeat the 1-60s) - After i replaced the caps and put the monitor back together, it wont even power on (nor illuminate the blue/orange light)

                  Anyone have any info as to where i should look for what ive done wrong when i replaced the caps to get this strange DCv fluctuation on the 11 pins (where i was hoping to see the 5vDC so i could the move on to taking readings on the Signal board).

                  thanks

                  Comment

                  • Lumberjack777
                    Badcaps Veteran
                    • Dec 2010
                    • 464

                    #829
                    Re: Hanns-G HG281D, LCD Monitor no power

                    Since your symptoms are worse, and it won't even power on at all now; we could conclude it has something to do with your cap replacement repair.

                    (1) Make sure the caps were put in the right way according to their polarity.

                    (2) Look for lifted pads on the solder joints. With that board I remember the manufacturer bent the legs all the way over onto the pads. Unless all the solder is removed, and the legs bent up; it's very easy with that board to pull a pad. I've repaired a few of those AFTER somebody attempted a repair, and every time it was a lifted pad that later caused the problem. When that happens you need to bend the leg of the cap, and connect it to where the the thin copper trace connected to from the cap leg's lifted pad.

                    Hope that helps.

                    Comment

                    • morozm
                      New Member
                      • Nov 2016
                      • 1
                      • Ukraine

                      #830
                      Re: Hanns-G HG281D, LCD Monitor no power

                      Dear Forum participants! Need power supply circuit monitor Hanns g 281d.
                      I will be grateful.

                      Comment

                      • demoncamber
                        Member
                        • Dec 2016
                        • 18
                        • USA

                        #831
                        Re: Hanns-G HG281D, LCD Monitor no power

                        I made my own thread
                        Last edited by demoncamber; 12-08-2016, 05:12 PM.

                        Comment

                        • poltrob
                          New Member
                          • Dec 2016
                          • 1
                          • UK

                          #832
                          Re: Hanns-G HG281D, LCD Monitor no power

                          Hi Everybody,

                          I am a long time owner of the Hanns G and have experienced problems for years, usually the monitors takes 5/10 minutes after I've turned it on to show picture, after which it's stable.
                          This week I tried to turn it on but didn't get anything at all from the power led.
                          I started looking for ways to fix it and happened upon this great Thread !
                          I have now taken the screen appart and had a look. I'd like to change the capacitors as It's been advised in this thread, but also noticed an issue on the back of the power board, on Capacitor C404 which appears to be burned.

                          I've searched this thread but it doesn't look like this has been mentionned before so I'd like to ask you what kind of capactior I'd need here (is it a Capacitor ?) as this looks really tiny. Or will it work even without this maybe?

                          Thanks a lot for your help,

                          Comment

                          • momaka
                            master hoarder
                            • May 2008
                            • 12160
                            • Bulgaria

                            #833
                            Re: Hanns-G HG281D, LCD Monitor no power

                            Originally posted by poltrob
                            I'd like to change the capacitors as It's been advised in this thread, but also noticed an issue on the back of the power board, on Capacitor C404 which appears to be burned.

                            I've searched this thread but it doesn't look like this has been mentionned before so I'd like to ask you what kind of capactior I'd need here (is it a Capacitor ?) as this looks really tiny.
                            Could you post some pictures of that? I don't remember off the top of my head what kind of capacitor C404 is. If it's a small tan square/rectangle one, then that will certainly need replacing as it may be shorted. But again, I think it's better we see some pictures first of your board before jumping to conclusions.

                            Comment

                            • nolse
                              New Member
                              • Feb 2017
                              • 3
                              • fr

                              #834
                              Re: Hanns-G HG281D, LCD Monitor no power

                              Hello
                              I have a screen hg281d down.
                              At the start, it cycle on red blue green.
                              I replace c80 & C83.
                              I do not have 1.8V to regulator vs18.
                              The output is short-circuited with ground.
                              The regulator is ok, the capacitor is ok.
                              I do not have the schema to find or is short circuit.
                              If anyone had the schema.

                              thank you

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #835
                                Re: Hanns-G HG281D, LCD Monitor no power

                                So how many Ohms is at the output pin? <10 Ohms?
                                Never stop learning
                                Basic LCD TV and Monitor troubleshooting guides.
                                http://www.badcaps.net/forum/showthr...956#post305956

                                Voltage Regulator (LDO) testing:
                                http://www.badcaps.net/forum/showthr...999#post300999

                                Inverter testing using old CFL:
                                http://www.badcaps.net/forum/showthr...er+testing+cfl

                                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                http://s807.photobucket.com/user/budm/library/

                                TV Factory reset codes listing:
                                http://www.badcaps.net/forum/showthread.php?t=24809

                                Comment

                                • nolse
                                  New Member
                                  • Feb 2017
                                  • 3
                                  • fr

                                  #836
                                  Re: Hanns-G HG281D, LCD Monitor no power

                                  regulator vs18 : 1 ohm between output and groud
                                  and regulator not on pcb 700 ohm

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #837
                                    Re: Hanns-G HG281D, LCD Monitor no power

                                    There should be SMD MLCC (Multi Layer Ceramic Cap) about 0.1 uF connected in parallel with the electrolytic cap that is connected to the output pin of that regulator also, did you remove that MLCC to see if the low resistance will go away?
                                    Never stop learning
                                    Basic LCD TV and Monitor troubleshooting guides.
                                    http://www.badcaps.net/forum/showthr...956#post305956

                                    Voltage Regulator (LDO) testing:
                                    http://www.badcaps.net/forum/showthr...999#post300999

                                    Inverter testing using old CFL:
                                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                    http://s807.photobucket.com/user/budm/library/

                                    TV Factory reset codes listing:
                                    http://www.badcaps.net/forum/showthread.php?t=24809

                                    Comment

                                    • nolse
                                      New Member
                                      • Feb 2017
                                      • 3
                                      • fr

                                      #838
                                      Re: Hanns-G HG281D, LCD Monitor no power

                                      This is c82 was hs.
                                      thanks.
                                      now the screen turns on but there are red dots everywhere.
                                      The tensions are good.
                                      An idea?

                                      Comment

                                      • e76nystrom
                                        New Member
                                        • Mar 2017
                                        • 2
                                        • USA

                                        #839
                                        Re: Hanns-G HG281D, LCD Monitor no power

                                        I am trying to repair an HF-289H monitor with a Phihong PSM 217-404-H-R power supply like the one pictured in this link: https://www.badcaps.net/forum/attach...8&d=1435812326

                                        I have done some trouble shooting on the monitor. I have 5v on the 5vsb line with the control board unplugged. When a supply power to the control board the 5vsb line falls to around 2.5v.

                                        I have decided to replace the capacitors and have found all the capacitors 22uf and above from DigiKey, but am having trouble finding the following:

                                        c114 2.2uf 50v
                                        c406 and c108 10uf 50v
                                        c606 1 uf 100v

                                        I can find capacitors with the right capacitance and voltage rating, but none in the series that recommended and none with a specification for ESR.

                                        Are there any recommendations for these?

                                        On the control board there are 23 100uf 16v capacitors. I have also been unable to find a good replacement for these. Are these likely to have failed?

                                        Comment

                                        • momaka
                                          master hoarder
                                          • May 2008
                                          • 12160
                                          • Bulgaria

                                          #840
                                          Re: Hanns-G HG281D, LCD Monitor no power

                                          Originally posted by e76nystrom
                                          I have decided to replace the capacitors and have found all the capacitors 22uf and above from DigiKey, but am having trouble finding the following:

                                          c114 2.2uf 50v
                                          c406 and c108 10uf 50v
                                          c606 1 uf 100v

                                          I can find capacitors with the right capacitance and voltage rating, but none in the series that recommended and none with a specification for ESR.
                                          Hi e76nystrom, welcome to the forums!

                                          Here is a more comprehensive list of capacitors suitable for PSU use:
                                          https://www.badcaps.net/forum/showpo...22&postcount=9

                                          With that said, the following caps should be okay:

                                          for 2.2uf 50v:
                                          493-1887-ND
                                          https://www.digikey.com/product-deta...1887-ND/589628

                                          for 10uf 50v:
                                          493-11421-3-ND
                                          https://www.digikey.com/product-deta...1-1-ND/4319977

                                          for 1uf 100v:
                                          493-1962-ND
                                          https://www.digikey.com/product-deta...1962-ND/589703

                                          Originally posted by e76nystrom
                                          On the control board there are 23 100uf 16v capacitors. I have also been unable to find a good replacement for these. Are these likely to have failed?
                                          If they are near "hot spots" such as heatsinks and linear regulators (i.e. 1117 or similar), then they might have dried up.

                                          Again, Nichicon PW, Panasonic FC, and Chemicon KY should be okay to replace those. If you need links, let me know. Otherwise, I will let you search for them as an exercise/homework.

                                          Comment

                                          Related Topics

                                          Collapse

                                          • Tynan Dill
                                            Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                            by Tynan Dill
                                            I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                            Upon bringing it home and plugging it up, it showed a standby light.

                                            I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                            The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                            With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                            Assuming...
                                            11-22-2024, 01:46 PM
                                          • PantherDave
                                            Microsoft Surface Pro (5th gen) model 1796 - no power
                                            by PantherDave
                                            Hi all!

                                            I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅

                                            I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
                                            https://www.badcaps.net/forum/troubl...-hardware-devi...
                                            05-29-2024, 02:01 PM
                                          • GLISIT
                                            Asus Probook P5440UF-XB74 power issue
                                            by GLISIT
                                            Hi all,

                                            TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!


                                            I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!

                                            A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about...
                                            01-16-2025, 02:29 PM
                                          • sam_sam_sam
                                            Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
                                            by sam_sam_sam
                                            I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

                                            One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
                                            03-31-2024, 02:12 PM
                                          • mikey5791
                                            Philips 196V3L monitor power led off
                                            by mikey5791
                                            Hi, i was given this lcd monitor last week with the issue of power led blinking. Upon checking the power board, i found 2 pieces electrolytic caps bulged and replaced them.
                                            Later, when i switched on ac power and detected 5v and 15v dc at output pins. But as soon as i pressed on the front power button, the led on power button lights for 1 second and it turns off.

                                            So, i tried disconnect the flex ribbon cable from t con board. But all i got is a white screen with nothing on. I suspect there is something short somewhere that prevent the display being turned on. Can someone with...
                                            01-25-2024, 07:52 PM
                                          • Loading...
                                          • No more items.
                                          Working...