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    #21
    Re: polaroid tv capacitor identification

    Originally posted by Krankshaft
    I have a few caps with that TSC name I got them from Jameco way back when before I strictly went with brand name caps.

    Garden variety Chinese crap is my guess.

    Since you can't move the caps you're going to have to put in some robust caps that can deal with the heat.

    Speaking of which looks like there was supposed to be two 10 uf caps and they cut it down to one. Unless that's the one you removed.

    I hope that thermal strip missing from the left bottom heatsink is stuck on the TVs metal back plate.

    They did this because the heatsinks on the board don't have enough surface area to dissipate the heat. Those thermal strips conduct it to the TVs backplate which has a larger surface area.

    A great mod to cut down heat would be to add additional strips to improve heat transfer. The heatsinks on the left have room for 2 more and the large one on the right has room for 3 more.
    would it be a good idea to cut a few holes on the backing plate to expose the heat sinks? or maybe wire up a small computer fan on the backside of the tv?

    Comment

      #22
      Re: polaroid tv capacitor identification

      Originally posted by elbtax
      Rube,
      Here are some pics of the guts of the tv. They are not great but you will see the two psu are very similar...
      Nothing wrong with the quality of those pictures, What is the information on the caps themselves (voltage, value, brand and series)?

      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.

      Comment

        #23
        Re: polaroid tv capacitor identification

        Originally posted by PlainBill
        Nothing wrong with the quality of those pictures, What is the information on the caps themselves (voltage, value, brand and series)?

        PlainBill
        maybe im crazy, but I can make out 10uf 450V on those caps lol.but in any case elbtax pm'ed me with the specs. they are rated at 10uf 450V
        Last edited by therube; 06-14-2010, 12:37 PM.

        Comment

          #24
          Re: polaroid tv capacitor identification

          Originally posted by therube
          would it be a good idea to cut a few holes on the backing plate to expose the heat sinks? or maybe wire up a small computer fan on the backside of the tv?
          Exposing the heatsinks and cutting a hole without a fan wouldn't do much good since the heat sinks are so small they're bad conductors. Adding a small fan into that hole would be a good supplement to the original cooling though.

          From what I've heard these Polaroids run quite hot and this heat kills mediocre and crap caps quickly.
          Last edited by Krankshaft; 06-14-2010, 12:47 PM.
          Elements of the past and the future combining to make something not quite as good as either.

          Comment

            #25
            Re: polaroid tv capacitor identification

            Originally posted by therube
            maybe im crazy, but I can make out 10uf 450V on those caps lol.but in any case elbtax pm'ed me with the specs. they are rated at 10uf 450V
            Voltage and capacitance are only two of the parameters that are important here. The surge current and ESR should also be taken into consideration. Failure to do so can result in a premature failure. Given the number of failures reported, going with 'pretty good' probably won't be good enough.

            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.

            Comment

              #26
              Re: polaroid tv capacitor identification

              Originally posted by PlainBill
              Voltage and capacitance are only two of the parameters that are important here. The surge current and ESR should also be taken into consideration. Failure to do so can result in a premature failure. Given the number of failures reported, going with 'pretty good' probably won't be good enough.

              PlainBill
              how would I find out about the surge current and ESR? what exactly do they mean?

              Thanks
              Rube

              Comment

                #27
                Re: polaroid tv capacitor identification

                I have the same TV with the same problem, but my caps are originals. HEC brand, 10μF 450V. Printed on the other side is ZP105°CU42. What caps will be good to replace these?

                Comment

                  #28
                  Re: polaroid tv capacitor identification

                  I ordered these made by Nichicon:

                  http://search.digikey.com/scripts/Dk...me=493-2069-ND

                  PlainBill suggested these made by Panasonic:

                  http://search.digikey.com/scripts/Dk...2W100&x=31&y=8

                  maybe he can chime in on which is better. I had already ordered the ones manufactured by Nichicon before I read his suggestion. The ones I ordered are rated at 8000hrs at 105*C, the ones PlainBill mentioned are rated at 10000hrs at 105*C. Another difference I see is their physical size.
                  The Nichicon caps are 0.630" Dia x 0.984" H (16.00mm x 25.00mm)
                  The panasonic caps are 0.492" Dia x 0.787" H (12.50mm x 20.00mm)
                  Can you measure your stock caps and post up the size?
                  Last edited by therube; 06-14-2010, 07:05 PM.

                  Comment

                    #29
                    Re: polaroid tv capacitor identification

                    They are about 7/8" by 1/2".

                    Comment

                      #30
                      Re: polaroid tv capacitor identification

                      Originally posted by reid52
                      They are about 7/8" by 1/2".
                      sounds like the panasonic caps are closer to the stock size caps. I'll try out the ones I ordered by Nichicon since they already shipped.

                      Comment

                        #31
                        Re: polaroid tv capacitor identification

                        Originally posted by therube
                        sounds like the panasonic caps are closer to the stock size caps. I'll try out the ones I ordered by Nichicon since they already shipped.
                        I just placed an order for the Panasonic ones, once I replace them I'll get back on how well they worked.

                        Comment

                          #32
                          Re: polaroid tv capacitor identification

                          There were a couple of points I was looking at. The Nichicon are good quality caps, but appear to be designed for use in a 'conventional' SMPS. More emphasis was made on the ripple at 120 Hz than at higher frequencies. They DID spec the ripple current at 100Khz at 75 ma.

                          The datasheet for the Panasonic parts was the new style, which I dislike, but it specifically mentioned a ripple current rating of 490Ma at 100Khz. This would be the capacitor of choice for the output of a PFC 'front end'. Provided this power supply does have one.

                          The other (minor) difference was the Panasonics are rated for 10000 hours at 105°C, the Nichicon at 'only' 8000.

                          Bottom line, EITHER of these caps are worlds better than the ones therube found in his TV.

                          I have been unable to identify the characteristics of the caps reid52 found in his TV. HEC appears to be an old line American company making water cooled ceramic caps for radio transmitters. I doubt any of their products would be found in a TV made in China (or Korea, or Japan, or the USA).

                          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.

                          Comment

                            #33
                            Re: polaroid tv capacitor identification

                            Rube,
                            I ordered the panasonics. Here are pics of the solder side. Notice the grey looking solder joints. (Pic3) I haven't reflowed yet, Probably today cause parts should be in on the morrow.
                            Attached Files
                            Last edited by elbtax; 06-15-2010, 10:51 AM.

                            Comment

                              #34
                              Re: polaroid tv capacitor identification

                              The originals::

                              SONJIU ELECTRONIC ENTERPRISE CO., LTD.

                              KM Series

                              http://www.sonjiu.com.tw/style/conte...0095&id=223991

                              The ripple shown is is 87 on those.
                              Last edited by PCBONEZ; 06-15-2010, 01:28 PM.
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                                #35
                                Re: polaroid tv capacitor identification

                                Oops. Never mind fat fingered the wrong button.
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                                  #36
                                  Re: polaroid tv capacitor identification

                                  It seems to be at 120Hz vs 100kHz
                                  Mann-Made Global Warming.
                                  - We should be more concerned about the Intellectual Climate.
                                  -
                                  Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                                  - Dr Seuss
                                  -
                                  You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                                  -

                                  Comment

                                    #37
                                    Re: polaroid tv capacitor identification

                                    is it just me or does the primary filter cap in the 2nd pic of post #4 look like it's about to blow out the top?

                                    could be the photo, but i doubt it with that much of a dent outwards.
                                    may also explain why the other caps failed.. (?)

                                    Comment

                                      #38
                                      Re: polaroid tv capacitor identification

                                      Scenic,
                                      When i first saw the cap i thought it was bulging. Looked at pictures on other post and the main filter cap looks the same.
                                      My two caps that are bad are the same as Reid52 with the exception of the cap reading ZP195[B]CV15. I ordered the Panasonics also. Let ya'll know the outcome tomorrow.
                                      Attached Files

                                      Comment

                                        #39
                                        Re: polaroid tv capacitor identification

                                        Adding a fan will help... It will sustain the transistors and the caps. Since the heatsinks are too small, it's a good idea to use one! The forced air will allow the too-small heatsinks to dissipate more heat.

                                        Another thing to do is to use an infared thermometer to test the temperature around the caps with the screen running for a while. Let us know of any hot spots.

                                        Did you ever hear a static-like noise from the PSU? Have someone with good ears (if yours aren't) listen for you after replacing the caps because that could indicate failing PWM controller or FETs.

                                        Also listen for another similar noise which could indicate a short in the high-voltage output. My Poloroid issues started with a short on the high-voltage wire where it attaches to the board that connects to all the CCFLs.

                                        Aside: My wife can hear the high frequency noise from each separate SMPS on the PSU from a few feet away, which really helps troubleshooting!

                                        Comment

                                          #40
                                          Re: polaroid tv capacitor identification

                                          I replaced those 2 caps today, took like 5 minutes....TV works fine again. no strange noises or anything either!
                                          Next thing is im going to rig up a spare computer fan in the back of the TV and have it blow air across the heat sinks.
                                          Thanks again to everyone who helped.
                                          Rube

                                          Comment

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