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Samsung Syncmaster 226BW

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    #1

    Samsung Syncmaster 226BW

    I've got a Samsung SyncMaster 226BW that I replaced the caps on but the screen is dark. I'm not a newbie to soldering or cap replacement, but this is a bit more than I have dealt with as far as troubleshooting goes and I am trying to expand my skills.

    It looks like the previous owner might have tried a recap on it, but I went ahead and replaced them with Panasonic FCs and an FM for the 330uf 25V in C112. It powers up but is dark, not a 2 seconds to black, just dark from the get go. Power indicator is on and the image is visible with a flashlight. The fuse is good, I've checked that.

    So, now my questions...

    Am I correct in assuming I likely have a lamp problem?
    Do I need to buy 4 lamps or just 1?
    How would I go about troubleshooting the lamps to figure out which one(s) is bad?
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    #2
    Re: Samsung Syncmaster 226BW

    Originally posted by diana View Post
    It powers up but is dark, not a 2 seconds to black, just dark from the get go. Power indicator is on and the image is visible with a flashlight. The fuse is good, I've checked that.
    See if the mosfets on the inverter board/section are shorted or not.
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      #3
      Re: Samsung Syncmaster 226BW

      Also, check to make sure BL_ON is > 3V DC on the power board.

      PS. I have one of these and I really like the display. I got it as "not working". It was a simple capacitor replacement job. This is easily my favourite monitor.
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        #4
        Re: Samsung Syncmaster 226BW

        I checked IC703, but I am not sure how to test IC702 and IC705 because there are 5 pins and not 3.

        IC703 readings were
        1/2 .378
        1/3 .686
        2/3 .686

        I found a BL-EN on the inverter board. Is that it? And how do I test it?
        Attached Files

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          #5
          Re: Samsung Syncmaster 226BW

          BL-En(able) DC volts looking for approx 3v between that pin and ground. when a signal is applied from a PC,and the Power LED showing it has recognised that signal

          Comment

            #6
            Re: Samsung Syncmaster 226BW

            Rtech,

            Thanks for the clarification, but will you give me specifics on testing that, please? I do not see a pin labeled ground. Please be detailed in DMM setting, which pins to test across, whether the unit is powered on or unplugged, etc.

            Comment

              #7
              Re: Samsung Syncmaster 226BW

              Pins 2,3 and 4 are Ground (GND),Pin 9 is marked ON/OFF.Meter set to DC Volts,Black lead(-) to either 2,3 or 4, and red (+) to pin 9.You are looking for between 3 and 4 volts DC.The monitor needs to be put back together Power on, and a input signal from a Computer.

              Comment

                #8
                Re: Samsung Syncmaster 226BW

                Originally posted by diana View Post
                fuse is good, I've checked that.
                Just to be clear, which fuse did you test?
                F301?
                36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

                Comment

                  #9
                  Re: Samsung Syncmaster 226BW

                  Originally posted by smason View Post
                  Just to be clear, which fuse did you test?
                  F301?
                  I had tested F101. I hadn't even seen F301. But that looks like it is blown. I will start by replacing that F301 fuse. Good call, Smason. Thanks.

                  Comment

                    #10
                    Re: Samsung Syncmaster 226BW

                    I changed the F301 fuse and powered it up. Same issue. No backlights. I rechecked the fuse and it's blown again. Any ideas?

                    Comment

                      #11
                      Re: Samsung Syncmaster 226BW

                      Originally posted by diana View Post
                      I changed the F301 fuse and powered it up. Same issue. No backlights. I rechecked the fuse and it's blown again. Any ideas?
                      Shorted FETs. What are the part numbers on U302 and U303?
                      36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

                      Comment

                        #12
                        Re: Samsung Syncmaster 226BW

                        Originally posted by smason View Post
                        shorted fets. What are the part numbers on u302 and u303?
                        4511geo
                        649182

                        I gather they are, and tested them as P-channel FETs. They are both reading .500 (diode mode) 6/7 pins + to 2/3 pins - in circuit.
                        Last edited by diana; 03-15-2013, 01:37 PM.

                        Comment

                          #13
                          Re: Samsung Syncmaster 226BW

                          They's dual FETs so each device is 2 FETs.
                          I think this is the device:



                          Which should mean that
                          Fet1 D S G
                          Pin 8&7 1 2

                          FET2 D S G
                          Pin 6&5 3 4
                          36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

                          Comment

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