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Problems with Samsung 740N monitors

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    Re: Problems with Samsung 740N monitors

    As these have exactly the same board as 740N's, that is also the reason Search pointed me here, I would stay in this thread, thank you very much;-)

    Line is the same, 7 means 17", 9 means 19", yes?
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      Re: Problems with Samsung 740N monitors

      Originally posted by Behemot View Post
      As these have exactly the same board as 740N's, that is also the reason Search pointed me here, I would stay in this thread, thank you very much;-)
      Boards are often "re-used" between models, but if your monitors were listed under their actual model# then a basic newbie search would find them, and all it would take would be a cross-ref there to the 740 thread(s).
      Friends don't let friends buy Samsung ....

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        Re: Problems with Samsung 740N monitors

        Here it is again as an attachement.
        Attached Files
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          Re: Problems with Samsung 740N monitors

          What is the pwm IC chip on the back of the board?
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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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            Re: Problems with Samsung 740N monitors

            I am not able to read that clearly, it looks like BIT3195(0?). However, earlier posts here talk about BIT3193.
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              Re: Problems with Samsung 740N monitors

              Originally posted by Behemot View Post
              I am not able to read that clearly, it looks like BIT3195(0?). However, earlier posts here talk about BIT3193.
              http://pdf1.alldatasheet.com/datashe...C/BIT3193.html

              According to datasheet, pin 7 is GND and pin 10 is VDD.

              1) See if pin 7 and pin 10 are shorted.

              2) If not, measure the DC voltage on pin 10.
              --- 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 ---

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                Re: Problems with Samsung 740N monitors

                Can you post a picture of the logic board please?
                "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                -Leonid Brezhnev (On the Yom Kippur War)

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                  Re: Problems with Samsung 740N monitors

                  I have an 740N with a IP-35155A board. After switching the screen on the backlight is on for about two seconds and then goes off. The screen itself is still displaying, i can see it with a flashlight.
                  I replaced all capacitors which didn't help. The board has both transformators in one shell instead of two separate ones. The resistance on output side between 1 and 2 is about 1kohm, between 3 and 4 about 7.5kohm. So i think the transformer is faulty. On the upperside it has printed TM-1017, on the downside SEM1852. Where can i get a drop-in replacement for this transformer? I'm in europe.
                  Thanks.

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                    Re: Problems with Samsung 740N monitors

                    Originally posted by sowi View Post
                    I have an 740N with a IP-35155A board. After switching the screen on the backlight is on for about two seconds and then goes off. The screen itself is still displaying, i can see it with a flashlight.
                    I replaced all capacitors which didn't help. The board has both transformators in one shell instead of two separate ones. The resistance on output side between 1 and 2 is about 1kohm, between 3 and 4 about 7.5kohm. So i think the transformer is faulty. On the upperside it has printed TM-1017, on the downside SEM1852. Where can i get a drop-in replacement for this transformer? I'm in europe.
                    Thanks.
                    TM-1017 is readily available on Ebay.

                    Comment


                      Re: Problems with Samsung 740N monitors

                      Dear all.
                      I have 740N and totally dead, led off dan smell something burn before it's dead. Before dead my 740N can be displayed but need about 5-10 minutes. I cek, one component, i don't know what it's melt, i can identified the series because the mark is missing, anyone knows what the cmponent it's?.
                      I'm also already change the 3 cap (1000uf/16v) and 1 470uf/25v, but it's not working. and where is the 3A pico fuse found? am i must change this fuse too??

                      Thanks for help.


                      Attached Files

                      Comment


                        Re: Problems with Samsung 740N monitors

                        Originally posted by indrair View Post
                        Dear all.
                        I have 740N and totally dead, led off dan smell something burn before it's dead. Before dead my 740N can be displayed but need about 5-10 minutes. I cek, one component, i don't know what it's melt, i can identified the series because the mark is missing, anyone knows what the cmponent it's?.
                        I'm also already change the 3 cap (1000uf/16v) and 1 470uf/25v, but it's not working. and where is the 3A pico fuse found? am i must change this fuse too??

                        Thanks for help.


                        up..up.. help please

                        Comment


                          Re: Problems with Samsung 740N monitors

                          Ok - you are not going to get much help by bumping a post.
                          You would get more help if you didnt post pictures in line and if the front of the board picture was the other way up so the numbers could be read.
                          A quick look through this thread doesnt show a board like this one and I have tried to find the board but failed - didnt spend a lot of time as I cant really read the model no.
                          Please state the model number and revision of the board and get a magnifing glass and post any numbers off the burnt component that you can decipher.
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment


                            Re: Problems with Samsung 740N monitors

                            This board does not look very good to say. It seems there is no fuse at all, thats usually the reas for half of the components to burn. Also thre are ordinary diodes instead of bridge rectifiers.

                            Anyway, to me, the component looks more like manual (re)soldered/changed to me. Is that some kind of dual transistor in one package?
                            Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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                              Re: Problems with Samsung 740N monitors

                              @INDRAIR3:
                              Service manual:
                              http://elektrotanya.com/?q=showresul...oria=&kat2=all
                              That DUAL MOSFETs are badly burnt out, you need to look at the service manual for the P/N first. The IC (on the bottom side of the board) that drives the MOSFETs may be damaged also.
                              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


                                Re: Problems with Samsung 740N monitors

                                Having enhanced your pic I think it might be one of these
                                http://ndft.com.ua/sites/default/fil...ic/stu407d.jpg
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment


                                  Re: Problems with Samsung 740N monitors

                                  Originally posted by Behemot View Post
                                  Here it is again as an attachement.
                                  Anyone has the board shown in my earlier post (#304)? What is the R316 value please?
                                  Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

                                  Exclusive caps, meters and more!
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                                    Re: Problems with Samsung 740N monitors

                                    @behomot
                                    Hi - have you taken it out - can you see the colours on the underside?
                                    What does it measure?

                                    Here is another board http://obrazki.elektroda.net/58_1284496626.jpg

                                    Is that Brown Grey Black Gold - 18ohms 5%

                                    Or Brown Black grey silver 1000M ohms 10%
                                    Last edited by selldoor; 03-27-2012, 09:41 AM.
                                    Please upload pictures using attachment function when ask for help on the repair
                                    http://www.badcaps.net/forum/showthread.php?t=39740

                                    Comment


                                      Re: Problems with Samsung 740N monitors

                                      Better Idea - PM Bocca and ask him he has the same board and is working on it now.
                                      Please upload pictures using attachment function when ask for help on the repair
                                      http://www.badcaps.net/forum/showthread.php?t=39740

                                      Comment


                                        Re: Problems with Samsung 740N monitors

                                        I have it but the restistor is totaly burned and reads as wire :-D I have replied in the thread of his…
                                        Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

                                        Exclusive caps, meters and more!
                                        Hardware Insights - power supply reviews and more!

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                                          Re: Problems with Samsung 740N monitors

                                          More likely to be low Ohm (18, if those are the colors) since it will be impoosible to have high enough voltage on the board to generate enough current through 1000M ohms to burn it up.
                                          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

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