Announcement

Collapse
No announcement yet.

Hanns-G 281D -- No power, Replaced Powerboard

Collapse
X
Collapse
 
  • Page of 2
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
    #21
    Re: Hanns-G 281D -- No power, Replaced Powerboard

    When I tried plugging everything in and turning the unit on, I get nothing -- no blue light, no orange light nada. The SB voltage continues to fluctuate from 4.8V down to 3.8V. When I probed the 12V & 24V rails, I got no change in the fluctuation.

    Comment

      #22
      Re: Hanns-G 281D -- No power, Replaced Powerboard

      Try replacing the startup cap.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

        #23
        Re: Hanns-G 281D -- No power, Replaced Powerboard

        could you direct me to the startup cap on my pictures? would it be a big one, or a smaller one?

        Comment

          #24
          Re: Hanns-G 281D -- No power, Replaced Powerboard

          is it c603, c606 or c707? I had read on the previous mega-post about this same monitor that these three are traditionally the problem children of this board.

          Comment

            #25
            Re: Hanns-G 281D -- No power, Replaced Powerboard

            1) U201 might be your 8 pin SMPS controller for 5V SB.

            2) On the top should be a part number. Use the part number to find its datasheet.

            3) On the datasheet, there will be one pin called VCC.

            4) Now power off and unplug your lcd.

            5) Put your multimeter on continuity.

            6) Put your red probe on the VCC pin.

            7) Put your black probe on the positive leg on C205, then C203.

            8) The one that beeps is your startup cap.
            --- 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

              #26
              Re: Hanns-G 281D -- No power, Replaced Powerboard

              hi retiredcaps,

              well, i got ahold of the company in china -- they are gonna send another board out. however, i'm not holding my breath that this one will work any better than the one they sent previously.

              In the meantime, i have been searching for the datasheet for my board so I can locate the VCC to track down the starter cap. I haven't had any luck -- an old post about this same board had a data sheet linked here:

              http://html.alldatasheet.com/html-pd...SDM0265RL.html

              I'm not really that familiar with the sheets, so I'm not sure what I should be looking for. The exact post is this:

              https://www.badcaps.net/forum/printt...&pp=20&page=11

              It lists U601, but you had suggested 201, and it didn't look like there was a consensus if that was even the correct sheet to begin with. Is there a good place to track down that info? I'm not even sure which is the "8 pin" connector because the only connectors on this board are 10 and 11 pins.

              Comment

                #27
                Re: Hanns-G 281D -- No power, Replaced Powerboard

                What is the part number on U201?
                --- 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

                  #28
                  Re: Hanns-G 281D -- No power, Replaced Powerboard

                  Hi guys,

                  Well I got my new board, and for the last couple days it worked fine but it started getting harder and harder to turn on and now it's not turning on again.

                  I measured the SB voltage, and it would fluctuate from 4.97V down to 3.9v and then back up to 4.97. I'm guessing this board has the same problem as the other replacement board, as well as the original board. I'm going to try replacing the caps again, this time on board #2 and see what happens.

                  Comment

                    #29
                    Re: Hanns-G 281D -- No power, Replaced Powerboard

                    Originally posted by tylerwerrin View Post
                    Well I got my new board, and for the last couple days it worked fine but it started getting harder and harder to turn on and now it's not turning on again.

                    I measured the SB voltage, and it would fluctuate from 4.97V down to 3.9v and then back up to 4.97.
                    The above symptoms suggest caps with high ESR just like Mishannya.

                    https://www.badcaps.net/forum/showthread.php?t=11329

                    As I have mentioned several times with this particular monitor, it runs temperature hot and seems to dry out most of the caps on the power and main board.

                    Your seller obviously has no testing procedures to verify that these boards are good.
                    --- 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

                      #30
                      Re: Hanns-G 281D -- No power, Replaced Powerboard

                      yep, makes sense. At least the replacement board came free of charge. I posted on the homepage asking for a "re-cap" service, due to my crappy soldering/desoldering on the original board, which I destroyed but didn't get a response.

                      The solder points are alot smaller than i'm used to dealing with, dangit!

                      Comment

                        #31
                        Re: Hanns-G 281D -- No power, Replaced Powerboard

                        Seems like this board is going out on a lot of people at the same time. In the attached picture. The caps circled in red definitely need to be replaced. And you should also replace the ones circled in blue because they might eventually dry out too. Good luck! L-J-7
                        Attached Files

                        Comment

                          #32
                          Re: Hanns-G 281D -- No power, Replaced Powerboard

                          does someone have a complete list of the caps for this board?

                          Comment

                            #33
                            Re: Hanns-G 281D -- No power, Replaced Powerboard

                            Originally posted by Qbass70 View Post
                            does someone have a complete list of the caps for this board?
                            Yes - you do, assuming you have the board in front of you.
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                              #34
                              Re: Hanns-G 281D -- No power, Replaced Powerboard

                              I just saw this page and just finished repairing this board in discussion.
                              I know it is late but someone might be just repairing the board so here is the answer to the last question.

                              Attached is a file with the caps used on this board ( PSM217-404-H-R ).



                              ~Sam~
                              Attached Files

                              Comment

                                #35
                                Re: Hanns-G 281D -- No power, Replaced Powerboard

                                thanks! thats helpful to see it listed like that. i actually have all the caps, just never got around to diving in... too afraid!

                                Comment

                                  #36
                                  Re: Hanns-G 281D -- No power, Replaced Powerboard

                                  Ive been sitting with a dead monitor for about a year now. Loved it when it worked, but nothing anymore. Just seems like 0 power is going through it. Guess Ill spend the $10 on caps and try it out. Looking at the board / caps they all look in good shape. Where did you all order the caps from? Cant find part numbers?

                                  Comment

                                  Previous 1 2 template Next
                                  Working...