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    #1

    Trutech PLV16190 picked off a trash pile

    Hi again. I saved this TV/Monitor from the landfill about 2 weeks ago. Plugged it in and nothing works so I'm gonna do the PS board re-cap cause it has the little bad green caps on it. I count 5 of the smaller ones. The biggest cap is black so I'm thinking it wil be OKey.

    I found another thread on this exact same TV and the help said for the OP to change only 3 caps. That seemed to get the OP's TV up and running but for how long before the other bad green caps go. That brings me to the main board and all the little green caps on that(30+)!!! Should I even worry about those?

    Here's some pics. THX
    Attached Files
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    #2
    Re: Trutech PLV16190 picked off a trash pile

    Samxon GF series caps are problematic. I can't tell from your picture if they are GF series or not.

    Capacitors die from age, heat, and shoddy build quality. Capacitors DO NOT have to be visibly bloated in order to bad. They can be out of tolerance uF (a 1000uF measures 20uF) and/or have high ESR (ohm). A multimeter will be insufficient to test for ESR. For that you need an ESR tester which costs between $50 and $300.
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      #3
      Re: Trutech PLV16190 picked off a trash pile

      those are in fact samxon GF.
      you can see a hint of a "F" in the second pic (corner of the sleeve), and if you play around with the gamma and contrast on the 3rd pic, you can (more or less) clearly read GF

      Comment

        #4
        Re: Trutech PLV16190 picked off a trash pile

        Thanks. Panasonic a good replacement?

        Comment

          #5
          Re: Trutech PLV16190 picked off a trash pile

          it will say "GF" on the side where the datecode and the 105°C is

          Comment

            #6
            Re: Trutech PLV16190 picked off a trash pile

            Originally posted by junkmansam View Post
            Panasonic a good replacement?
            Yes. Memebers here like Panasonic FR, FM, and FC in that order. All these series are low ESR (with FR being the lowest).
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              #7
              Re: Trutech PLV16190 picked off a trash pile

              dont forget to look around and check the besics( fuses, solder joints) while you re in there.

              Best of luck!!

              Comment

                #8
                Re: Trutech PLV16190 picked off a trash pile

                Pulled the badcaps today. 5 total on the power board all had GF(M) on them.
                1x470uf 16v
                1x47uf 50v
                2x1200uf 25v
                1x1500uf 16v

                Don't know what solder the factory used but it was a chore to get it to flow and my iron is 40 watter.

                I'll update when I get the replacements in. Thanks!

                Comment

                  #9
                  Re: Trutech PLV16190 picked off a trash pile

                  add some solder to make desoldering easier.
                  the flux in the added solder helps to get going, because there is none on those boards usually (cleaned off from the factory)

                  Comment

                    #10
                    Re: Trutech PLV16190 picked off a trash pile

                    Hi again, got all the caps in the mail today and I jumped on it and got them in just fine. Thanks. Now I noticed that the fuse is blown (never did think to check it from the start) and I have a few basic questions. Its a T3.15AL 250V fuse but I don't know whether to get slow blow or fast? Sorry for the freshman question.

                    Comment

                      #11
                      Re: Trutech PLV16190 picked off a trash pile

                      Originally posted by junkmansam View Post
                      Hi again, got all the caps in the mail today and I jumped on it and got them in just fine. Thanks. Now I noticed that the fuse is blown (never did think to check it from the start) and I have a few basic questions. Its a T3.15AL 250V fuse but I don't know whether to get slow blow or fast? Sorry for the freshman question.
                      That's a sophomore question. A freshman would have jumpered it with a 14 gauge wire.

                      Usually the input fuse is a time delay fuse. The T confirms that.

                      PlainBill
                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

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                        #12
                        Re: Trutech PLV16190 picked off a trash pile

                        before you put a new fuse in (i assume thats the AC line fuse?) check the bridge rectifier for shorts.

                        Comment

                          #13
                          Re: Trutech PLV16190 picked off a trash pile

                          Originally posted by retiredcaps View Post
                          Yes. Memebers here like Panasonic FR, FM, and FC in that order. All these series are low ESR (with FR being the lowest).
                          re: FR being lower ESR ---> Horsefeathers!

                          FR is nothing more than re-branded/re-marked FM with some of the sizes dropped. It's all smoke-and-mirrors to slowly reduce the number of FM available in "in-between" sizes.

                          Pull the sheets and compare.

                          If you compare FR & FM by can sizes, nothing has changed, except values are missing in steps up the scale and the *cough* Endurance Hours have magically increased. Yes, there are -probably- changes in materials and processes to get the better hours, but that's not how a cap is run anyway.
                          veritas odium parit

                          Comment

                            #14
                            Re: Trutech PLV16190 picked off a trash pile

                            Got some sloblo fuses at the shack put them in and theres smoke (fail). Couldn't see where the smoke was coming from cause I had to clam shell the unit to test but I assume the new fuse is now toast.

                            I'm reaching the limit on the $$ I want to spend to fix it cause I made the mistake of ordering some caps from mouser and they really overcharge on shipping.

                            How do I test the bridge rectifier? I have a meter.

                            Some pics. One is my solder questionable work. The other two are of what I think is the rectifier.
                            Attached Files
                            Last edited by junkmansam; 03-29-2011, 09:33 AM. Reason: pics

                            Comment

                              #15
                              Re: Trutech PLV16190 picked off a trash pile

                              Originally posted by Toasty View Post
                              re: FR being lower ESR ---> Horsefeathers!
                              I meant FR being lower ESR than FC. I realize FR and FM are identical. For future posts, I'll write FR/FM, FC.
                              Last edited by retiredcaps; 03-29-2011, 11:06 AM.
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                                #16
                                Re: Trutech PLV16190 picked off a trash pile

                                Originally posted by junkmansam View Post
                                How do I test the bridge rectifier? I have a meter.
                                The bridge rectifier is usually black long rectangular with 4 pins and labeled as "BD" on the PCB. Number the pins 1,2,3, and 4.

                                If you have a manual range multimeter, put it to 200 ohms. Measure the following pin combinations in circuit. 1-2, 1-3, 1-4, 2-3, 2-4, 3-4. Any reading under 30 ohms suggests a short. To verify, desolder the rectifier and retest out of circuit.
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                                  #17
                                  Re: Trutech PLV16190 picked off a trash pile

                                  I see a BG1 black tall and rectangular but nothing you said. BG1 has 4 pins. There is another much smaller black flat one but it has 8 pins.
                                  Attached Files

                                  Comment

                                    #18
                                    Re: Trutech PLV16190 picked off a trash pile

                                    Originally posted by junkmansam View Post
                                    BG1 has 4 pins.
                                    It is BG1. That is your bridge rectifier.
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                                      #19
                                      Re: Trutech PLV16190 picked off a trash pile

                                      I know it has useless Samxon GF caps but going by the blown fuse they were probably still OK.

                                      I'd agree with the diagnosis of shorted rectifiers or other primary-side components.


                                      Inspect them all carefully under good light and magnifier if needed, find out where the smoke came from.

                                      Sometimes you can find out where a fault is by just carefully looking at the components...
                                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                      -David VanHorn

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                                        #20
                                        Re: Trutech PLV16190 picked off a trash pile

                                        Originally posted by retiredcaps View Post
                                        The bridge rectifier is usually black long rectangular with 4 pins and labeled as "BD" on the PCB. Number the pins 1,2,3, and 4.

                                        If you have a manual range multimeter, put it to 200 ohms. Measure the following pin combinations in circuit. 1-2, 1-3, 1-4, 2-3, 2-4, 3-4. Any reading under 30 ohms suggests a short. To verify, desolder the rectifier and retest out of circuit.
                                        All right, back to the bench. +1234- is the order I used. R~B. I tried setting my MM to 200 ohms but couldn't get any reading. Only on the lowest setting which just has a symbol could I get a reading.
                                        1-2= .58
                                        1-3= .56
                                        1-4= .54
                                        2-3= .67
                                        2-4= .58
                                        3-4= .58

                                        Thanks for helping.

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