40PFL3705D/F7 blurry screen

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  • SHADOW3277
    Senior Member
    • Jun 2014
    • 123
    • United States
    #1

    40PFL3705D/F7 blurry screen

    Hello. I was at my local recycling center this past weekend and they had a 40PFL3705D/F7 with a cracked panel. I had an empty chassis with a good panel already so I took it home and removed all the parts from the cracked one and put it in the good one I had. The panel sticker numbers were the same.

    The issue is when I hook any video up, the screen gets blurry including the menu. I have tried it on HDMI and coaxial and it is the same result on either one. If I have it on an input that is not hooked up and bring up the menu up it is perfectly fine.

    So I am going with a main board issue but this set has 2 seperate ones. There is a seperate main board for HDMI and another board for the rest. I am not sure which one I need to replace. I am leaning towards the digital main. Any advice would be appreciated.
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    • SHADOW3277
      Senior Member
      • Jun 2014
      • 123
      • United States
      #2
      Re: 40PFL3705D/F7 blurry screen

      So I replaced the digital main and there was no change. Should I replace the analog main or does anyone have another suggestion?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: 40PFL3705D/F7 blurry screen

          Does this TV have 120Hz motion option? Tried turning that off?
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • SHADOW3277
              Senior Member
              • Jun 2014
              • 123
              • United States
              #4
              Re: 40PFL3705D/F7 blurry screen

              Originally posted by tom66
              Does this TV have 120Hz motion option? Tried turning that off?
              I turned the 120Hz off and there was no change.

                Comment

                • SHADOW3277
                  Senior Member
                  • Jun 2014
                  • 123
                  • United States
                  #5
                  Re: 40PFL3705D/F7 blurry screen

                  Ended up replacing the Frc CBA board to correct the problem.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: 40PFL3705D/F7 blurry screen

                      Glad to hear. That board is responsible for 120Hz conversion.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • bikerbuddy
                          Senior Member
                          • Jun 2011
                          • 134
                          • USA
                          #7
                          Re: 40PFL3705D/F7 blurry screen

                          Hey guys I have been following this thread and want to know what is the Frc CBA board?
                          thanks .

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: 40PFL3705D/F7 blurry screen

                              Originally posted by bikerbuddy
                              Hey guys I have been following this thread and want to know what is the Frc CBA board?
                              thanks .
                              Board inbetween main board & T-con board which handles conversion of 60Hz video into 120Hz by adding in-between frames. Say it sees a football on one frame and then it's moved on another... it works by guessing where the football was in between... usually it looks a bit rubbish to me but some people like it.
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

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