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    #21
    Re: Phillips 42PFL5432D/37 Chirping and No Picture

    Originally posted by tw1ztid View Post
    Continuity is fine to test the diodes though?
    1) Nope. Use the diode check function to check diodes.

    2) Post a picture of your multimeter.
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      #22
      Re: Phillips 42PFL5432D/37 Chirping and No Picture

      Dont have it yet. Slow day at work and trying to be prepared. I know how much i question every little thing , and worry if i do it right I'm sure im overcomplicating it. Sorry for that in advance.. lol. Once i catch on to the basics it all gets very simple.

      Comment

        #23
        Re: Phillips 42PFL5432D/37 Chirping and No Picture

        Originally posted by tw1ztid View Post
        Sorry for that in advance.. lol.
        No worries. With power off and the TV unplugged, there is very little you can do to damage the TV, multimeter or yourself.

        Both the resistance and diode checks are done with the power off and TV unplugged.

        It is when the power is ON, that you have to be careful because one slip of the probe can cause a short.

        edit: See posts #19 and 20

        https://www.badcaps.net/forum/showthread.php?t=10419

        In the guide, I have sections on multimeter, fuses, and diodes.
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          #24
          Re: Phillips 42PFL5432D/37 Chirping and No Picture

          Originally posted by retiredcaps View Post
          No worries. With power off and the TV unplugged, there is very little you can do to damage the TV, multimeter or yourself.

          Both the resistance and diode checks are done with the power off and TV unplugged.

          It is when the power is ON, that you have to be careful because one slip of the probe can cause a short.

          edit: See posts #19 and 20

          https://www.badcaps.net/forum/showthread.php?t=10419

          In the guide, I have sections on multimeter, fuses, and diodes.
          Thanks, that is 100x better than the video imo because it covers many different things. Was mainly worried that i wouldn't get the correct readings or short something. Be back later.

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            #25
            Re: Phillips 42PFL5432D/37 Chirping and No Picture

            Got everything ready.
            Attached Files

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              #26
              Re: Phillips 42PFL5432D/37 Chirping and No Picture

              Plug your red probe into the red circled spot. Black probe into COM. The black probe will always stay in COM.

              1) For the diode test, set the meter to the diode test function (blue).

              2) For the resistance test (fuse), set the meter to the 200 (two hundred) scale (yellow).
              Attached Files
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                #27
                Re: Phillips 42PFL5432D/37 Chirping and No Picture

                Ok, first results..

                ZD904 .02 and .02

                ZD902 .05 and .05

                D925 .07 and .07

                D912 .000 and .000

                I should desolder one side from each to retest now? I've repeatedly been getting the same results. There are other D and ZD diodes that the results came back fine.

                Edit: checking fuses right now, so far so good
                Attached Files
                Last edited by tw1ztid; 01-23-2012, 12:08 AM.

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                  #28
                  Re: Phillips 42PFL5432D/37 Chirping and No Picture

                  Originally posted by tw1ztid View Post
                  Ok, first results..

                  ZD904 .02 and .02

                  ZD902 .05 and .05

                  D925 .07 and .07

                  D912 .000 and .000

                  I should desolder one side from each to retest now?
                  If you switched the leads around, then yes all those readings suggest the diodes are all bad. You will have to desolder and retest out of circuit.

                  It is possible that something else on the board is shorted and causing all these potentially false positives.
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                    #29
                    Re: Phillips 42PFL5432D/37 Chirping and No Picture

                    Originally posted by retiredcaps View Post
                    If you switched the leads around, then yes all those readings suggest the diodes are all bad. You will have to desolder and retest out of circuit.

                    It is possible that something else on the board is shorted and causing all these potentially false positives.
                    I'll remove them shortly then, I cannot find any other fuses on the inverter boards than the one on the power board..

                    Comment

                      #30
                      Re: Phillips 42PFL5432D/37 Chirping and No Picture

                      Originally posted by tw1ztid View Post
                      I'll remove them shortly then, I cannot find any other fuses on the inverter boards than the one on the power board..
                      Fuses begin with the letter "F". For example, F100.

                      Your 4 fuses circled in red.
                      Attached Files
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                        #31
                        Re: Phillips 42PFL5432D/37 Chirping and No Picture

                        Thanks, never seen a fuse other than the glass looking ones.

                        All 4 read at .3, so they seem fine.

                        So far we're down to either

                        1) Diodes are bad and need replaced, casualties from when the Caps went bad?

                        2) Another (larger?) part of the power board is causing a false positive.

                        I'm leaning towards number one, like Mr. Bills situation, but I know to expect the unexpected.. I'll start off by removing one leg of each diode and checking for false positives. If they are, what do you recommend for being my first plan of action?

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                          #32
                          Re: Phillips 42PFL5432D/37 Chirping and No Picture

                          Originally posted by tw1ztid View Post
                          I'll start off by removing one leg of each diode and checking for false positives.
                          Remove them and test them out of circuit. Report your multimeter results for each one.
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                            #33
                            Re: Phillips 42PFL5432D/37 Chirping and No Picture

                            ZD904 .02 and .02

                            ZD902 .05 and .05

                            Havin a bitchin time trying to get these things out.

                            Starting on removing the next two..

                            Comment

                              #34
                              Re: Phillips 42PFL5432D/37 Chirping and No Picture

                              After removing it, D925 now gives me .463 and no reading the other way. So it looks good after all

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                                #35
                                Re: Phillips 42PFL5432D/37 Chirping and No Picture

                                Originally posted by tw1ztid View Post
                                ZD904 .02 and .02

                                ZD902 .05 and .05
                                ZD904 and ZD902 are bad for sure.

                                Havin a bitchin time trying to get these things out.
                                Add fresh 60/40 solder to the joint first to help with thermal transfer.
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                                  #36
                                  Re: Phillips 42PFL5432D/37 Chirping and No Picture

                                  Originally posted by tw1ztid View Post
                                  After removing it, D925 now gives me .463 and no reading the other way.
                                  D925 is good. What about D912?

                                  BTW, there is no such thing as "no reading". If it reads "1" on the left hand side, that means "out of range" or "infinity".

                                  Remember a diode lets current one way and blocks the other way.

                                  Hmm, we get this on a daily basis now. Time to write another guide. See

                                  https://www.badcaps.net/forum/showpo...2&postcount=31
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                                    #37
                                    Re: Phillips 42PFL5432D/37 Chirping and No Picture

                                    Originally posted by retiredcaps View Post
                                    D925 is good. What about D912?

                                    BTW, there is no such thing as "no reading". If it reads "1" on the left hand side, that means "out of range" or "infinity".

                                    Remember a diode lets current one way and blocks the other way.

                                    Hmm, we get this on a daily basis now. Time to write another guide. See

                                    https://www.badcaps.net/forum/showpo...2&postcount=31
                                    Ok, that's what I meant. So it's good.

                                    Edit: Checking D912
                                    Last edited by tw1ztid; 01-23-2012, 05:52 PM.

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                                      #38
                                      Re: Phillips 42PFL5432D/37 Chirping and No Picture

                                      D912 is out of range, and .43

                                      it's good.

                                      Comment

                                        #39
                                        Re: Phillips 42PFL5432D/37 Chirping and No Picture

                                        Originally posted by tw1ztid View Post
                                        D912 is out of range, and .43
                                        Okay, time to order parts. Remember tom66's suggestion and you might want to get 4 just in case they blow for some other reason. I'm guessing these diodes should be under $1 each?
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                                          #40
                                          Re: Phillips 42PFL5432D/37 Chirping and No Picture

                                          I'll start searching for FR4007 thanks!

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