Main board Magnavox 32ME402V/F7

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Main board Magnavox 32ME402V/F7

    BTW, see how to read parts map of the main board.
    Right now I cannot find the schematic of the TV so that C3214 I refer to in the other 2 links provided may not be the same as C3214 as used on your main board, that is why you need to test as suggested in post 8 first.
    We need to see meter so I can make sure you set it properly to read resistance.
    Attached Files
    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

    • beuknowsdiddly
      Member
      • Jul 2019
      • 19
      • United States

      #22
      Re: Main board Magnavox 32ME402V/F7

      First, here's the piece of crap meter I got. Doesn't even beep for shorts.

      https://www.amazon.com/Crenova-Auto-...s%2C162&sr=8-4

      If that's not good enough, just let me know and I'll get a better one.

      It looks like the cap is from C3828.

      Here's a picture of where I pulled it from. I thought maybe because it was near that 330 coil it's possible, as that was where that guy pulled his from on that youtube video.

      How do I check DC resistance on that cap?
      Attached Files

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: Main board Magnavox 32ME402V/F7

        That meter is fine. You do not use continuity for checking for shorts since some meter will beep with continuity as high as 50 Ohms, use Ohm mode to check the resistance of the component.
        1) TV is NOT plugged into the outlet.
        2) Have all boards connected back together
        3) Set meter to Ohm mode, if you do not know how, read the user manual.
        4) Keep Black probe of the meter on the metal chassis or on jumper wire J106 (GND) on the power supply board.
        5) Put Red probe of the meter on the Cathode (banded marking) of diode D653, take pictures of the meter screen showing the resistance reading.
        6) Move Red probe of the meter to the Cathode (banded marking) of diode D651, take pictures of the meter screen showing the resistance reading.
        BTW, you know what the diode is and know which is Cathode which is Anode, correct? If not do the search to learn about diode and how they are marked.
        I am using picture from Shopjimmy as the reference: https://assets.shopjimmy.com/media/c...1fg024-top.jpg
        Regarding to C3828 resistance check, just put meter is Ohm mode and put the probes of the meter on each end of the cap, it does not matter which probe goes to which end of the cap since it is not polarized cap, report the reading.
        Last edited by budm; 07-10-2019, 10:08 AM.
        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

        • beuknowsdiddly
          Member
          • Jul 2019
          • 19
          • United States

          #24
          Re: Main board Magnavox 32ME402V/F7

          So I'm thinking I have to deal with that C3828 I took out first. Measured off the board and it just reads 0.L Then I soldered it back and it reads 85 ohms.
          It's strange though because I know it's not polarized so shouldn't it read the same either way? One way reads 85 and the other reads 65. Is that normal?

          I still need to take the tv apart and remove the new board and replace it with this one to continue following your troubleshooting instructions. Crossing my fingers I don't screw anything up now that it's working with the new board. lol
          Attached Files

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: Main board Magnavox 32ME402V/F7

            Originally posted by beuknowsdiddly
            So I'm thinking I have to deal with that C3828 I took out first. Measured off the board and it just reads 0.L Then I soldered it back and it reads 85 ohms.
            It's strange though because I know it's not polarized so shouldn't it read the same either way? One way reads 85 and the other reads 65. Is that normal?

            I still need to take the tv apart and remove the new board and replace it with this one to continue following your troubleshooting instructions. Crossing my fingers I don't screw anything up now that it's working with the new board. lol
            Showing OL is fine for that cap. there are other components connected in parallel with the caps, so the resistance reading may not be the same in both directions. The resistance you are getting right now may or may not be related to the problem you have.
            BTW take the resistance reading as instruct with new main board in place so you will have comparison reading between old and new board. You can also check the resistance of the C3828 of the new board to see what you get.
            And since I show you where C3214 is, you can also check the resistance of that cap now to see what you get.
            Last edited by budm; 07-10-2019, 08:34 PM.
            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

            • beuknowsdiddly
              Member
              • Jul 2019
              • 19
              • United States

              #26
              Re: Main board Magnavox 32ME402V/F7

              On it! Thank you!

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Main board Magnavox 32ME402V/F7

                OK, I look at the main board layout, you can do resistance testing of the bad main board without having it connected to the power supply board.
                Check the resistance between point 'A' and 'GND' as marked in the picture in both directions, this test the 21V power supply line.
                Attached Files
                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

                • beuknowsdiddly
                  Member
                  • Jul 2019
                  • 19
                  • United States

                  #28
                  Re: Main board Magnavox 32ME402V/F7

                  I'm not sure what you mean by "both ways" you want me to put the red probe on ground and the black on A also?

                  The normal way black to ground and Red to + I get 14.7 ohms. This is the bad board NOT plugged into the power supply.

                  Here's a pic of the same spot on my board if it matters.

                  When I test the good one which is plugged into the power board I get 11.

                  and when I test that C3214 I get 1.4 unplugged from the power board.

                  The other good one reads .257 plugged in to the power board.
                  Attached Files
                  Last edited by beuknowsdiddly; 07-11-2019, 12:36 AM.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Main board Magnavox 32ME402V/F7

                    [QUOTE=beuknowsdiddly;904952]I'm not sure what you mean by "both ways" you want me to put the red probe on ground and the black on A also? Reply: Yes.

                    The normal way black to ground and Red to + I get 14.7 ohms. This is the bad board NOT plugged into the power supply.

                    Here's a pic of the same spot on my board if it matters.

                    When I test the good one which is plugged into the power board I get 11.

                    and when I test that C3214 I get 1.4 unplugged from the power board.

                    The other good one reads .257 plugged in to the power board.[/QUOTE]

                    1) The 14.7 Ohms reading is not right. What do you get when do the same test with the good board (not connected to power supply board).
                    2) "and when I test that C3214 I get 1.4 unplugged from the power board." Is that 1.4 Ohms. 1.4 K Ohms, or 1.4 M Ohms? Show us the pictures of the meter display.
                    3) "The other good one reads .257 plugged in to the power board.[/QUOTE] Is that .257 Ohms, .257 K Ohms, .257 M Ohms? Show us the picture of the meter display.
                    Last edited by budm; 07-11-2019, 09:47 AM.
                    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

                    • beuknowsdiddly
                      Member
                      • Jul 2019
                      • 19
                      • United States

                      #30
                      Re: Main board Magnavox 32ME402V/F7

                      Okay I'm sorry.

                      1) No matter how many times I try it I keep getting 14.5, 14.6 or 14.7 and the letter disappears next to the ohms symbol. The good board, unplugged from the power board reads 33.6 KOhm.

                      2) 1.5 Ohms bad board.

                      3) .257 kohms Good board.
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Main board Magnavox 32ME402V/F7

                        Originally posted by beuknowsdiddly
                        Okay I'm sorry.

                        1) No matter how many times I try it I keep getting 14.5, 14.6 or 14.7 and the letter disappears next to the ohms symbol. The good board, unplugged from the power board reads 33.6 KOhm.

                        2) 1.5 Ohms bad board.

                        3) .257 kohms Good board.
                        So C3214 is showing 1.5 Ohms on the bad board, so try removing that C3214 first. But remember this, there are other caps that is connected in parallel with C3214 also, so it does not mean for sure that C3214 is shorted out, it can be other caps that are connected in parallel with C3214 are shorted out, just like in one of the link I provided earlier. So remove C3214 the use the Ohme meter to test the pads on the board where C3214 was to see if the shorts is gone or not, if not, then it will be a lots more work to find out what other caps are connected in parallel with C3214.
                        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

                        • beuknowsdiddly
                          Member
                          • Jul 2019
                          • 19
                          • United States

                          #32
                          Re: Main board Magnavox 32ME402V/F7

                          Thanks Bud,

                          I think it's time to give this board a proper burial. The pads still read 1.5 and since I don't know how to read a board, there's really no point for me to continue. I have no clue where to go next and I'm sure you have a lot more interesting projects and people that DO have a clue that you would rather be working with.

                          Can you recommend some material for beginners that might give me a better understanding of boards, ohms, resistance etc.. ?

                          Thanks again, at least I'm a tad more enlightened, thanks to you!

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Main board Magnavox 32ME402V/F7

                            There are many free online electronics learning sites:
                            https://www.learnelectronicsonline.com/
                            http://www.learnabout-electronics.org/
                            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

                            • beuknowsdiddly
                              Member
                              • Jul 2019
                              • 19
                              • United States

                              #34
                              Re: Main board Magnavox 32ME402V/F7

                              Thanks again Bud!
                              I really appreciate all your help!

                              Comment

                              • R_J
                                Badcaps Legend
                                • Jun 2012
                                • 9535
                                • Canada

                                #35
                                Re: Main board Magnavox 32ME402V/F7

                                Is there a chassis number? (it might be a FL12.3) you might be able to locate a schematic, I believe the fl11.4 is close. You could try using a 9volt battery and connect it across that cap for a couple seconds at a time and see which other component gets hot
                                If its not a shorted cap it could be a shorted regulator ic input
                                Last edited by R_J; 07-12-2019, 07:06 PM.

                                Comment

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