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    #1

    Samsung T220HD Recap

    Hello!
    Stumbled onto this forum and have been loving the information available.

    I had a 40" Samsung needing to be recapped last summer and I completed it successfully. It got me hooked.

    I now have a T220HD that for sure needed to be recapped because I saw bulging caps on the power board. I replaced the group of three 1000uf caps and the one 2200uf with caps that had a slight increase in voltage. After replacing, it still behaves like it did before, which is that it powers on but the screen remains dark. It DID flicker my PC's desktop very clearly for a half second, which gives me hope.

    I will post pictures tonight, but I thought maybe someone might have some insight before then.

    Thanks for any help!
    -Keith
    Tags: None
    #2
    Re: Samsung T220HD Recap

    As promised, pictures.

    Turns on, power led lights, but no picture. Image 3 and 4 are before I replaced the caps.
    Attached Files

    Comment

      #3
      Re: Samsung T220HD Recap

      It sounds like you getting a "2 seconds to black" symptom. Do you hear a faint hiss after it shows the brief image?

      Comment

        #4
        Re: Samsung T220HD Recap

        No I did not. Any way to test that without reassembling the whole display?

        EDIT: Double checked caps I bought from Digikey, all 4 were Panasonic.
        Last edited by brillman; 09-14-2012, 05:59 PM.

        Comment

          #5
          Re: Samsung T220HD Recap

          Originally posted by brillman View Post
          It DID flicker my PC's desktop very clearly for a half second, which gives me hope.
          If there is a brief flicker all the time, then I would see if the mosfets are shorted (circled in red).

          If there was a brief flicker and nothing at all now, then check the fuse (circled in yellow).
          Attached Files
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            #6
            Re: Samsung T220HD Recap

            Originally posted by retiredcaps View Post
            If there was a brief flicker and nothing at all now, then check the fuse (circled in yellow).
            I am a beginner with these types of things. I assume using a multimeter to test, just on the continuity setting? And would I have to take it off the board to test it? Thanks for your help!

            EDIT: I tested it on the board and got a tone when testing.

            Comment

              #7
              Re: Samsung T220HD Recap

              Originally posted by brillman View Post
              EDIT: I tested it on the board and got a tone when testing.
              Recheck your fuse and additionally test the mosfet. Instructions in the appropriate section at

              https://www.badcaps.net/forum/showpo...4&postcount=19
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                #8
                Re: Samsung T220HD Recap

                Firstly, my multimeter is this model:
                http://www.iequus.com/Product/3310/H...MM-(10-MegOhm)

                Secondly, I think this is the datasheet for the MOSFET's in question:
                http://www.datasheetdir.com/AP4506GEH+download

                Finally:
                Fuse = 0.4 ohms (steady)
                MOSFET = 1 on far left side for all connections. Is this right?

                Comment

                  #9
                  Re: Samsung T220HD Recap

                  Originally posted by brillman View Post
                  Finally:
                  Fuse = 0.4 ohms (steady)
                  MOSFET = 1 on far left side for all connections. Is this right?
                  1) Both the above readings suggest the components are good.

                  2) On connector CN602S, there are 9 wires. Next to the 9 wires is a legend.

                  3) Plug in your monitor and power it on.

                  4) Put your multimeter on 20V DC.

                  5) Put your black probe on a ground screw that is right next to the 9 pin connector. This is your ground. Leave the black probe on the ground screw the entire time.

                  6) Put your red probe on each of the 9 pins.

                  7) Report your readings with the legend like so

                  pin 1 BO - I get 3.30V
                  pin 2 14.5V - I get 14.61 V

                  etc
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                    #10
                    Re: Samsung T220HD Recap

                    Again, because I'm new to this, how do I go about turning on the power board without reassembling the monitor? Or is there something I'm not getting about this procedure? Thanks for your help.

                    Comment

                      #11
                      Re: Samsung T220HD Recap

                      Originally posted by brillman View Post
                      how do I go about turning on the power board without reassembling the monitor?
                      Reassemble and connect all the boards. Just don't put the back cover on. Hit power button and take measurements.
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                        #12
                        Re: Samsung T220HD Recap

                        Pin 1 BO IM - 2.36 V
                        Pin 2 14.5V - 14.81 V
                        Pin 3,4,5 GND - -0.01 V
                        Pin 6,7 5.1V - 5.19 V
                        Pin 8 AD IM - 0.00 V
                        Pin 9 SW - 4.79 V

                        How is that looking? Took me a minute to get that thing powered while semi-put together. Let me know, thanks!!

                        Comment

                          #13
                          Re: Samsung T220HD Recap

                          Originally posted by brillman View Post
                          Pin 1 BO IM - 2.36 V
                          Pin 2 14.5V - 14.81 V
                          Pin 3,4,5 GND - -0.01 V
                          Pin 6,7 5.1V - 5.19 V
                          Pin 8 AD IM - 0.00 V
                          Pin 9 SW - 4.79 V

                          How is that looking? Took me a minute to get that thing powered while semi-put together. Let me know, thanks!!
                          1) BO IM = backlight on, inverter module. It should be > 0V which it is. The main board generates this signal to tell the backlights to come on.

                          2) Pin 2 is the voltage to the inverter module and it looks good.

                          3) Pin 6 and 7 provide power to the main board and it looks good.

                          4) AD IM is adjust dimness inverter module. At 0V it is good.

                          5) I'm not sure what SW stands for so I'm not 100% sure if 4.79V is good or not, but let's assume it is good for now.
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                            #14
                            Re: Samsung T220HD Recap

                            Next tests.

                            1) Power off and unplug lcd. Wait 5 minutes.

                            2) Put your multimeter to 2K ohms.

                            3) Measure the resistance between the 2 yellow dots. Report reading.

                            4) Do the same for the 2 red dots. Report reading.

                            5) Put your multimeter to 20M ohms.

                            6) Measure the resistance of the blue circled caps. The blue caps will have 2 legs each. Measure the resistance between those 2 legs. You should have 4 readings, one for each blue cap.
                            Attached Files
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                              #15
                              Re: Samsung T220HD Recap

                              Red Dots: 1.120
                              Yellow Dots: 1.124

                              All 4 blue caps read "1" on my multimeter at 20M.

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                                #16
                                Re: Samsung T220HD Recap

                                Originally posted by brillman View Post
                                MOSFET = 1 on far left side for all connections. Is this right?
                                1) What is the part number of the mosfet?

                                2) Can you list out the pin combinations that you tested?

                                3) What is the part number of the blue circled IC?
                                Attached Files
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                                  #17
                                  Re: Samsung T220HD Recap

                                  Originally posted by brillman View Post
                                  Red Dots: 1.120
                                  Yellow Dots: 1.124

                                  All 4 blue caps read "1" on my multimeter at 20M.
                                  Both the above readings suggest the components are good. The first test was the inverter secondary windings. The second test was the blue tuning caps.
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                                    #18
                                    Re: Samsung T220HD Recap

                                    Originally posted by retiredcaps View Post
                                    1) What is the part number of the mosfet?

                                    2) Can you list out the pin combinations that you tested?

                                    3) What is the part number of the blue circled IC?
                                    1. I read two numbers, but I believe this is the part number: 4506GEH (other number is 820038)

                                    2. S1,G1 | S1,D1 | G1,D1 | S2,G2 | S2,D2 | G2,D2 -- the one thing that was weird was that it appears the D1 and D2 were one large combined contact. There was no distinction between the two that I could tell.

                                    3. FAN7311

                                    Comment

                                      #19
                                      Re: Samsung T220HD Recap

                                      Refer to



                                      for Fan7311 pinout.

                                      Report the DC voltage for pins 1-20. Since this IC is closely packed together, have a steady hand and sharp probe to avoid slippage and shorting out the IC. Use a ground screw for ground (black probe).
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                                        #20
                                        Re: Samsung T220HD Recap

                                        @ dc 20v:
                                        1: 3.62
                                        2: -.01
                                        3: 3.98
                                        4: 4.01
                                        5: -.01
                                        6,7: 2.51
                                        8: 1.13
                                        9: 1.75
                                        10: 1.31
                                        11: 1.23
                                        12: 1.25
                                        13: 1.24
                                        14: 7.48
                                        15: 14.83
                                        16: -.01
                                        17: 14.83
                                        18: 14.83
                                        19: 7.64
                                        20: 0.00

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