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Samsung Syncmaster 245B Black screen and blue Power LED

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    #41
    Re: Samsung Syncmaster 245B Black screen and blue Power LED

    Great - my 245B is up and running again! I just had to replace the burned out resistor RB805. Thanks to all who contributed to this discussion!

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      #42
      Re: Samsung Syncmaster 245B Black screen and blue Power LED

      Help please,
      I have just been given a Samsung 245b and CM802 is missing, where can I get a CM802 (18n 630V capacitor). or any info on this item.

      Thanks for any help

      Terry

      Comment


        #43
        Re: Samsung Syncmaster 245B Black screen and blue Power LED

        For info just type cm802 into the "search" above.
        Where in the uk are you - perhaps update your profile?
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

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          #44
          Re: Samsung Syncmaster 245B Black screen and blue Power LED

          Thanks I have just updated my profile. I have typed in CM802 in the search. Lot of things about replaceing it. but as mine is missing I an not 100% sure what it is.

          Comment


            #45
            Re: Samsung Syncmaster 245B Black screen and blue Power LED

            Mouser: PHE450PA5180JR05

            http://www.mouser.com/Search/Product...E450PA5180JR05

            Datasheet:


            Works just fine. Bend the leads a bit to match.

            T
            veritas odium parit

            Comment


              #46
              Re: Samsung Syncmaster 245B Black screen and blue Power LED

              Dont follow - you have said it is 18nf 630v with a cm board description,
              so it is a capacitor. If it is missing how did you know 18nf 630v?

              When you say missing - has it disintegrated or does it look like its never been on there?

              I think it is not easy to find bur 22nf 630v is more common and can be used
              I think retiredcaps says in one of the posts.

              Ebay - from china
              RS Electronics Watford might have them 35 miles?
              Cricklewood electronics might have them
              Farnell
              Digikey
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment


                #47
                Re: Samsung Syncmaster 245B Black screen and blue Power LED

                All I know is that it is missing, you can see that something has be unsoldered.
                I found out is was 18nf 630v on a Badcaps post. I will have a look at the websites and see if I can find one.

                Thanks for the help

                Terry

                Comment


                  #48
                  Re: Samsung Syncmaster 245B Black screen and blue Power LED

                  there is this 22nf one on ebay

                  http://www.ebay.co.uk/itm/Panasonic-...item20c4ce855e
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment


                    #49
                    Re: Samsung Syncmaster 245B Black screen and blue Power LED

                    Terry, Did you see the SCH of the board in post 40? What is the board #? BN44-XXXXXXXX?
                    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


                      #50
                      Re: Samsung Syncmaster 245B Black screen and blue Power LED

                      Yes I have looked at the SCH board in post 40, same as my power board BN44-00173A. I have orderd the parts, I should get them in the next couple of days.

                      Thanks for all your help

                      Terry

                      Comment


                        #51
                        Re: Samsung Syncmaster 245B Black screen and blue Power LED

                        Just got the parts very fast delivery from CPC, replaced 3 x 68 OHM resistors with 3W ones and replaced CM802 with a panasonic capacitor ECQE6223JF.
                        All working now.

                        Thanks for all the help.

                        Terry

                        Comment


                          #52
                          Re: Samsung Syncmaster 245B Black screen and blue Power LED

                          Great news - well done! You may want to consider replacing all the middlesize caps to give it a bit longer life.
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment


                            #53
                            Re: Samsung Syncmaster 245B Black screen and blue Power LED

                            Thanks Guys
                            This and similar thread prompted me to to have a go at repair of my 245B which broke down yesterday with same description. ie: blue light no display.
                            Caps seemed ok no change from new, Changed the three resistors with 68 Ohm 1 watt (only had monster sized ceramic in larger wattage) and now all working fine again.

                            cheers
                            Scott

                            Comment


                              #54
                              Re: Samsung Syncmaster 245B Black screen and blue Power LED

                              I had the same problem with my syncmaster 245B (which has a BN44-00195A power supply).
                              Blue light came on but no image on the screen.

                              I was able to fix it and want to share my experiences.

                              At first, the problem was intermittent.
                              Sometimes an image was displayed and then suddenly it went black again.
                              Hitting the back or side of the screen a few times, often brought back the image.
                              But I had to hit it harder and harder to get the image back and after a few weeks I deciced to have a look inside.
                              After visual inspection I saw nothing special, no bad capacitors or resistors.
                              Also the fact that hitting it often/sometimes brought back the image made me believe it's not caused by an electronic component but by something else.
                              But what? A bad or loose transformer was my first guess.

                              I took out a DVM and started measuring on the stand-alone power board.
                              Standby 5.2V was ok. Connected it to the Pwr-On line to activate the other output voltages.
                              Nada, no 24V.

                              Then I started bending the PCB, pulling up one side while holding down the middle.
                              Don't do this with you bare hands or you'll get electrocuted!
                              All of a sudden, the 24V appeared!

                              Then I stumbled on this blog:
                              http://blog.whitesites.com/How-to-Fi...97265_blog.htm

                              Here they mention soldering joins that went bad.
                              So I re-soldered all big end medium joints and that did the trick.

                              So get your soldering iron out guys!

                              Cheers,
                              Tom

                              Comment


                                #55
                                Re: Samsung Syncmaster 245B Black screen and blue Power LED

                                not a good idea to hit lcd monitors - just so everybody knows.

                                Comment


                                  #56
                                  Re: Samsung Syncmaster 245B Black screen and blue Power LED

                                  Originally posted by WiseguyTom View Post
                                  I had the same problem with my syncmaster 245B (which has a BN44-00195A power supply).
                                  Blue light came on but no image on the screen.

                                  I was able to fix it and want to share my experiences.

                                  ...


                                  Then I stumbled on this blog:
                                  http://blog.whitesites.com/How-to-Fi...97265_blog.htm

                                  Here they mention soldering joins that went bad.
                                  So I re-soldered all big end medium joints and that did the trick.

                                  So get your soldering iron out guys!

                                  Cheers,
                                  Tom
                                  Thank you very much!
                                  I just resoldered every bigger component like in the image from the blog and it seems to did the trick! Let's see if it will fail in the next three days!



                                  Comment


                                    #57
                                    Re: Samsung Syncmaster 245B Black screen and blue Power LED

                                    Originally posted by bubblegum_bob View Post
                                    I just resoldered every bigger component like in the image from the blog and it seems to did the trick! Let's see if it will fail in the next three days!
                                    As one of the large caps in the lower right looks bulged, it probably will...

                                    re-atari

                                    Comment


                                      #58
                                      Re: Samsung Syncmaster 245B Black screen and blue Power LED

                                      Originally posted by re-atari View Post
                                      As one of the large caps in the lower right looks bulged, it probably will...

                                      re-atari
                                      That is NOT his board it is a picture of one out of the blog which was copied from another forum so it is at least 3rd hand.
                                      Please upload pictures using attachment function when ask for help on the repair
                                      http://www.badcaps.net/forum/showthread.php?t=39740

                                      Comment


                                        #59
                                        Re: Samsung Syncmaster 245B Black screen and blue Power LED



                                        That's my board and i think the cold solder joint was in one of the red circles.
                                        Some leg wobbled a little bit.
                                        Would this make sense?
                                        How hot are these components in operating state?

                                        Afterwards I didn't screwed the board properly fix to give a little bit more space for thermal expansion.
                                        Does this make sense?

                                        I'm no pro, therefore my questions.

                                        Comment


                                          #60
                                          Re: Samsung Syncmaster 245B Black screen and blue Power LED

                                          I have a Samsung SyncMaster SA450

                                          I seem to have the same problem but I don't know how to 'check' the different components with a micrometer (I've done it over 10 years ago...)

                                          Here's a couple pictures I took, it seems the screen had been opened up before as it was not so difficult to open... it's over 3 years old (work 2nd screen) :









                                          I have no idea where I should put the black and red metal points for the micrometer.
                                          Last edited by dan2k3k4; 08-26-2015, 08:30 AM.

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