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    LG W2241S white screen symptom

    Dear,
    my LG W2241S has a white screen symptom. Ive checked power board, logic board, panel board and T-con, without success. Do You have any experience or hints? Thank Zou in advance.

    #2
    Re: LG W2241S white screen symptom

    Recap the logic board and check the ribbon cable. Sometimes, if the ribbon cable is connected the other way, it can cause a white screen.

    Comment


      #3
      Re: LG W2241S white screen symptom

      Ive attached images of PWR, logic and panel board. Caps on logic board looks ok. Ive tried change PWR PCB+logic PCB+cable from similar type LG monitor, where is no white screen symptom. Without success.
      It looks as panel board problem, but where or how to find it?

      Thank You in advance.
      Attached Files

      Comment


        #4
        Re: LG W2241S white screen symptom

        Originally posted by emta41 View Post
        Ive attached images of PWR, logic and panel board. Caps on logic board looks ok. Ive tried change PWR PCB+logic PCB+cable from similar type LG monitor, where is no white screen symptom. Without success.
        It looks as panel board problem, but where or how to find it?

        Thank You in advance.
        1.Assemble all board as original.
        2.power on,
        a.check testpoint TP129 voltage (the voltage from AD board =5V)
        b.check testpoints VDDG VDDA VEEG VDDD voltage
        29.5V 13.0V -6.5V 3.3V
        3.If testpoint voltage is fail ,then check the panel
        IC502 regulator as pic.
        (top pin input=5V middle pin output=3V bottom pin =GND )

        PS:It is hard to check the IC502's voltage because of the panel's weak FPC.
        I solder a wire at middle pin ,then assemble all board , power on ,check voltage.
        That's my experience and change the NG IC502 ,monitor works again.

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          #5
          Re: LG W2241S white screen symptom

          Thank You, I will test it.

          Comment


            #6
            Re: LG W2241S white screen symptom

            Dear Duncanbest,
            what is the function of IC502 and where can I found the replacement? Ive found the FitiPower FP8805-33, but there is no datasheet.

            Comment


              #7
              Re: LG W2241S white screen symptom

              It's a regulator with fix 3.3V output (check #4 ,I input the wrong voltage value)

              I use a LDO SOT223 to replace . But I forgot the exactly part number.

              Maybe LD1117A or AIC1117-3.3 ,there are too many LDOs with the same function.

              Package SOT223 with in-out-GND (like pic. top to bottom) @1000mA LDO

              Comment


                #8
                Re: LG W2241S white screen symptom

                Just generic 1117-3.3V series. I.E.
                http://www.digikey.com/product-detai...ICT-ND/2095612
                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


                  #9
                  Re: LG W2241S white screen symptom


                  Thank You very much! The replacement of IC502 was helped.
                  The LCD works again!!!

                  Comment


                    #10
                    Re: LG W2241S white screen symptom

                    Great news, so what voltage did you get from the old 3.3V bad regulator?
                    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


                      #11
                      Re: LG W2241S white screen symptom

                      So, Ive used LD1117AS33TR for replacement. The measured voltage on old FitiPower FP8805-33 was 2V. But it is not so easy to measure it, as said Duncanbest...

                      Comment


                        #12
                        Re: LG W2241S white screen symptom

                        hi i don't have the VEEG (-6,5v ) any idea for this

                        thnx

                        Comment

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