Hisense F42K20E problem

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  • truep
    Badcaps Veteran
    • Aug 2010
    • 373
    • USA
    #1

    Hisense F42K20E problem

    This is an LCD set that won't turn on/off properly. I have 5V stb, 5v, and 14 V supplies on all the time. The LED supply doesn't come on. The on/off from the button board toggles, bur the power on on the power supply doesn't change(always low). There are a few regulators on the board. Most seem to test good. (5v in 3.2 out). One (I think it's a regulator) has 9.57v on pin 1, 0v pin 2 (center) Pin 3 4.98v. I can't identify the part. The markings are: CW78Do5, LZDDl5 (15?) , and MA104. It's the 3pin part just above the Tuner in the picture.
    I haven't been able to find a service manual. Can anyone help?
    Attached Files
    Last edited by truep; 05-11-2013, 09:35 AM. Reason: post picture
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: Hisense F42K20E problem

      Looks like a 5V fixed reg so 4.98V seems correct. May 2012, is that the date on your board? Warranty?
      Attached Files
      Last edited by tw2005; 05-11-2013, 09:53 AM.

        Comment

        • truep
          Badcaps Veteran
          • Aug 2010
          • 373
          • USA
          #3
          Re: Hisense F42K20E problem

          Yeah, I kinda figured that it might be a 5V reg. I have 20 V on the power supply pins labeled 14v. Don't kn0if that's a problem or a misprint. 12V is fine.

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: Hisense F42K20E problem

              Originally posted by truep
              There are a few regulators on the board. Most seem to test good. (5v in 3.2 out). One (I think it's a regulator) has 9.57v on pin 1, 0v pin 2 (center) Pin 3 4.98v. I can't identify the part. The markings are: CW78Do5, LZDDl5 (15?) , and MA104.
              Technically if it is a 3.3V regulator, 3.2 ouput implies 3.2000 which is out of spec according to most datasheets.

              A 78D05 is your classic 5V regulator.
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                Comment

                • truep
                  Badcaps Veteran
                  • Aug 2010
                  • 373
                  • USA
                  #5
                  Re: Hisense F42K20E problem

                  That should read pin3= 4.98V so it is a 5v regulator with the center pin grounded. I guess the cw 7805 is a 5v regulator with the cw prefix added.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Hisense F42K20E problem

                      May 2012 is the board manufacture date presumably, the TV would probably be at least a few weeks older (in terms of manufacture) and possibly months before it was sold, surely it has some warranty term left?

                      --

                      CRITIC COMMENT: Not a bad main board layout, pretty well made for a "Hisense". No bodges. Power resistors are a little out of place on a mostly SMD board. 8.5/10; nice try Hisense.
                      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

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia
                          #7
                          Re: Hisense F42K20E problem

                          Originally posted by tom66
                          May 2012 is the board manufacture date presumably, the TV would probably be at least a few weeks older (in terms of manufacture) and possibly months before it was sold, surely it has some warranty term left?

                          --

                          CRITIC COMMENT: Not a bad main board layout, pretty well made for a "Hisense". No bodges. Power resistors are a little out of place on a mostly SMD board. 8.5/10; nice try Hisense.
                          When I jumped on the SJ site, I realised where the photo was from so I doubt this is the actual board. The photo filename shows shopjimmy-159492-v.1-top.jpg

                            Comment

                            • truep
                              Badcaps Veteran
                              • Aug 2010
                              • 373
                              • USA
                              #8
                              Re: Hisense F42K20E problem

                              Yes the photo is from shop Jimmy That's the same board numbers.
                              Tom, I got this set second hand so I doubt they would honor any warranty and it's probably a "send it in" warranty.

                                Comment

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