Announcement

Collapse
No announcement yet.

Samsung Syncmaster 245BW

Collapse
X
Collapse
 
  • Page of 37
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 37 template Next
    #81
    Re: Samsung Syncmaster 245BW

    I should add that I have already replaced all the secondary electrolytic caps with Panny FMs and that did not solve the problem. Both montors have been returned back to the clients following a repalcement with new Samsung Power boards.

    Comment

      #82
      Re: Samsung Syncmaster 245BW

      Is the 24V rail jumping only with all six inverter outputs connected to the backlights or were you able to determine if the 24V was stable if one or more of the inverter loads
      was disconnected ?
      My order for the 24V F9222L controller IC has not yet arrived so I can't tell you for sure that replacing it will fix the problem. Will keep you posted once I get it replaced.

      Comment

        #83
        Re: Samsung Syncmaster 245BW

        Aruba,

        I did not go too deep into checking these boards after the caps were replaced and did not correct the problem.

        Users wanted the monitors back ASAP so I ordered new Samsung boards in to fix them. The lamps were all good on the jumping 24v one. I never leave lamps un-connected as the inverter board will detect open lamp and shut it off.

        Comment

          #84
          Re: Samsung Syncmaster 245BW

          Originally posted by lucky13
          Aruba,

          I did not go too deep into checking these boards after the caps were replaced and did not correct the problem.

          Users wanted the monitors back ASAP so I ordered new Samsung boards in to fix them. The lamps were all good on the jumping 24v one. I never leave lamps un-connected as the inverter board will detect open lamp and shut it off.
          Do you think leaving some of the inverter outputs disconnected is detrimental
          to the inverters ? I was able to at least see and determine the screen was
          stable when I left one of the six inverter output disconnected for about 2-3
          seconds before the inverter board decides to shut off. I checked out all six
          inverters one at a time and they all showed the screen without flicker during
          those 2-3 seconds before the screen goes black. This process told me the
          inverters and the backlight are ok and the problem is with the 24V.

          Comment

            #85
            Re: Samsung Syncmaster 245BW

            I was browsing badcaps and found this thread. Thing is, I have a Samsung SyncMaster 245B that was manufactured in December 2007.

            It's working fine at the moment (luckily), but i'm worried that it could fail at anytime in the near future judging by what's happened to other people's monitors. Is it safe to assume that it will?

            If so, what modifications should I do / components should I replace now to prevent it potentially failing in future?

            I'm in the UK, so I expect some of those ICs and that surface mount transistor will be difficult/imposible to find here.
            Most suppliers in china, etc... want a min order quantity of at least 100 and that would be v. expensive (plus P+P) if I only needed 1.

            Simon
            If it's broken, fix it. If it's not broken, improve it.

            Comment

              #86
              Re: Samsung Syncmaster 245BW

              Originally posted by technicalspecialist
              I was browsing badcaps and found this thread. Thing is, I have a Samsung SyncMaster 245B that was manufactured in December 2007.

              If so, what modifications should I do / components should I replace now to prevent it potentially failing in future?

              Simon
              Simon,

              Just replace those caps in the secondary side and it will go a long way to ensure your monitor works for a long, long time.

              13

              Comment

                #87
                Re: Samsung Syncmaster 245BW

                We did not found any bad capacitor on this monitor. So for me, the best thing to do and maybe help this f9222L to stay alive is to make a little mod on power supply board. Try to put 30k resistor on br component. Se the picture where. This will help m2power to suht of faster and maybe will live longer. This is mine opinion and i m not responsable if after this mod monitor dont start anymore. In my case i done this with 35k resistor and monitor is working ok. We will see if will come back again. Any sugestion from other guys here on forum is greatly apricieted.
                Attached Files

                Comment

                  #88
                  Re: Samsung Syncmaster 245BW

                  A little explanation fo my mod: during shut down time, this br npn transistor must go open and stay open, but for some reason of residue electricity remain conductive and because power supply is in shut down operation and no power is anymore supplyed to inverter and main board voltage jump rapidly to dangerous value, and burn the m2power controler. Some ideas to this i get from burned resistor found on this power supply.

                  Comment

                    #89
                    Re: Samsung Syncmaster 245BW

                    Any return information on this will be greatly apriciated ....

                    Comment

                      #90
                      Re: Samsung Syncmaster 245BW

                      OK I have the same monitor, HOW do I get the back cover off without breaking it?

                      Comment

                        #91
                        Re: Samsung Syncmaster 245BW

                        Pry it apart like this video ...

                        http://www.youtube.com/watch?v=Ul5Lh...eature=related

                        Originally posted by cbberry
                        OK I have the same monitor, HOW do I get the back cover off without breaking it?
                        --- 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

                          #92
                          Re: Samsung Syncmaster 245BW

                          Thanks. Worked like a charm. Typically, where do you guys go to get your parts?

                          Comment

                            #93
                            Re: Samsung Syncmaster 245BW

                            Thanks to everyone putting time into this
                            I am new to this level of DIY so I need a little advice on how to proceed.
                            1. my 245b has an issue similar to the ones described above. For a while it would periodically show artifacts on screen (these went away on power off-on)
                            Yesterday the screen stopped working (power-led is on but the screen remains black, Win7 seems to detect the screen correctly)
                            I have taken the screen appart and studied it closely but so far I didn't discover any bulged caps or anything burned.
                            Tomorrow I will find my multimeter and do some testing I guess but where to start?
                            Also, as I understand from the thread, caps, resistors and fuses can be defect without showing any signs of it, is this correct? Should I just go ahead and try to change some of the likely candidates or can we deduce anything from some simple meassuring?
                            (I am a novice both in regards to soldering and meassuring but I am a fast learner so I if anyonhe has the patience to help me it's be sweet ))
                            Any advice on how to proceed/what to try first?

                            Regards
                            RUne

                            Comment

                              #94
                              Re: Samsung Syncmaster 245BW

                              If you are in the USA, most here recommend Badcaps.net, Digikey, or Mouser (in no particular order).

                              Originally posted by cbberry
                              Thanks. Worked like a charm. Typically, where do you guys go to get your parts?
                              --- 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

                                #95
                                Re: Samsung Syncmaster 245BW

                                Originally posted by Naphtali
                                Also, as I understand from the thread, caps, resistors and fuses can be defect without showing any signs of it, is this correct?
                                Yes. All the above components can fail without noticeable visible indicators.

                                Originally posted by Naphtali
                                Should I just go ahead and try to change some of the likely candidates or can we deduce anything from some simple meassuring?
                                I recommend NOT changing things unless you have clues that suggest to proceed in that direction. You can narrow down the area by some simple measurements. For example, checking all the fuses can be done with a resistance or continunity test.

                                Attaching pictures (read FAQ first) will also help.
                                --- 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

                                  #96
                                  Re: Samsung Syncmaster 245BW

                                  Originally posted by retiredcaps
                                  Yes. All the above components can fail without noticeable visible indicators.



                                  I recommend NOT changing things unless you have clues that suggest to proceed in that direction. You can narrow down the area by some simple measurements. For example, checking all the fuses can be done with a resistance or continunity test.

                                  Attaching pictures (read FAQ first) will also help.
                                  I heartily agree. You can waste a lot of time and parts (money!!) replacing parts at random, or even because "Joe has the same monitor and he fixed his by replacing C16, so I replaced C16."

                                  One of the most outrageous examples of this occurred at a company I worked for 30 years ago. The product used a number of 4" by 10" circuit cards that plugged into a backplane. Each card had anywhere from a dozen to more than two dozen ICs. Usually the preliminary testing was done on a test box, the tech would set switches on the test box, and determine if the proper output appeared. If a particular step failed, he would try to identify the faulty component and give it to a reworker to repair.

                                  One particular 'tough dog' suffered an almost complete failure. Virtually NONE of the outputs responded properly. After a while trying to logically determine the cause, they started 'shotgunning' - replacing every part on the board. It STILL didn't work. Finally my predecessor gave the board to our most experienced reworker and told her to replace every IC, making sure there were no solder shorts, bent pins, broken traces, etc. Several hours later she brings the board back to him, and showed him a trace that had a tiny crack in it, where it had been hidden by an IC. By the time they got it working, that was one VERY expensive card!!!

                                  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

                                    #97
                                    Re: Samsung Syncmaster 245BW

                                    Just goes to show that thorough and proper testing can save A LOT of time and money!
                                    Just out of interest, what was this product that used multiple dozens of ICs?
                                    Some sort of computer from the 80s?
                                    If it's broken, fix it. If it's not broken, improve it.

                                    Comment

                                      #98
                                      Re: Samsung Syncmaster 245BW

                                      Originally posted by technicalspecialist
                                      Just goes to show that thorough and proper testing can save A LOT of time and money!
                                      Just out of interest, what was this product that used multiple dozens of ICs?
                                      Some sort of computer from the 80s?
                                      This was our 'flagship' product in 1981. It was a 9600 baud modem. It had a number of bells and whistles to allow remote maintenance, but the basic modem used two leased phone lines (no dial-up) to connect to another modem. It was very popular within the banking industry. A pair of them would set the buyer back $20,000. (At that time 300 baud was a 'high speed modem', most of us plugged along at 110 baud).

                                      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

                                        #99
                                        Re: Samsung Syncmaster 245BW

                                        Originally posted by cloepula
                                        Did you test the ics for supply voltage?? Try to test to see how is your voltages on the chip. On your picture i will mark test point for dc power supply on this chip, try to test ac voltage on the same test point. Let see how is yours reading .

                                        After seeing the success of a few people on here, I finally pulled the LCD monitor out again that I started this thread for. Cloepula, I checked the voltage you asked about and it was 15.61v. I bought a f9222l and installed it with no change. I checked my transistor 'BR' in place and I could only get a reading in one direction with my ohmmeter.

                                        Speaking of the shotgun approach, I thought maybe I would get lucky replacing the f9222l, but I still only get the standby voltage. Still just the blue light special and no picture.

                                        Welcome back Bill!

                                        Comment

                                          #100
                                          Re: Samsung Syncmaster 245BW

                                          I have the same monitor and i have the same problem.
                                          Resistor RB805 burned, QM802 also have a open circuit.
                                          If ICM801S (Fuji Electric controller f9222l ) is working, I don't now.

                                          Question:
                                          Is there a way to measure f9222l?
                                          Can i meassure with not connecting the invertor board?

                                          I have tryed with a temporely NPN transistor (BC547B) with a 10 omh resistor on base.
                                          No luck to get power on PCF4863G (pin 8 close to zero volt)
                                          Can i be sure to buy a new f9222l IC

                                          Thanks in advance,
                                          Harrie.

                                          Comment

                                          Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 37 template Next
                                          Working...
                                          X