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Memorex MLT3221 - No Power

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    #61
    Re: Memorex MLT3221 - No Power

    It looks like the brown colored caps are bloated from the top down view. If you have a multimeter that can measure uF, I would desolder them and measure uF.
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      #62
      Re: Memorex MLT3221 - No Power

      Hi, I think I need to jump in here. IPOS Rev 3.3 board, as discussed here, on this Polaroid 32" model. Set will do nothing, tried to turn on with push button on side of set since I have no remote. When it's plugged in, the red light in lower right front blinks consistently, that's all. Red light on P/S board is off...don't know where to start, except to say I have checked the most notable caps, diodes and fuses and all seems well. There is no 5v of anykind. I can hear a faint 'tick' coming from the P/S board about the same duration of the front LED blink... Where do I begin?

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        #63
        Re: Memorex MLT3221 - No Power

        Originally posted by johnnieboy2 View Post
        Where do I begin?
        Post pictures of your board in the same format and composition as Dgtech in post #1.

        See my sig file above in the previous post for instructions and limitations.
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          #64
          Re: Memorex MLT3221 - No Power

          What voltage (DC) do you have on the green fuse in the middle of the board?

          If no voltage there, check the voltage (DC) on the main cap?
          The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

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            #65
            Re: Memorex MLT3221 - No Power

            Polaroid TDA-03211C...will not turn on, LED on P/S is off, front LED blinks
            Attached Files

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              #66
              Re: Memorex MLT3221 - No Power

              The green fuse is between the big cap and the transformer. Check both sides with a voltmeter. DC Voltage
              The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

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                #67
                Re: Memorex MLT3221 - No Power

                around 315 volts, pretty steady on the cap to ground and 400vdc across the cap...fluctuates around 312-320 on both sides of the fuse. What's the significance of the blinking red LED on front of the TV, not seen any reference to this indicator.

                You didn't ask, but I'm showing from .6 to 2.0 volts fluctuation on 5v standby.
                Last edited by johnnieboy2; 10-15-2011, 06:07 PM.

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                  #68
                  Re: Memorex MLT3221 - No Power

                  Another bit of background info...The set was given to me and I have no idea what the initial problem might have been. The set is as clean as new all over, no signs of burned components or smoke stains/smell. Just that blinking red LED in the lower right front of set and nothing when 'power on' button pushed...no remote. As for me I know my way around an electronic circuit as long as I've got a signal/power path to follow. In the old days we had Sam's Photofacts to guide us in situations like this. Thanks to you for providing this help site!

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                    #69
                    Re: Memorex MLT3221 - No Power

                    Originally posted by johnnieboy2 View Post
                    You didn't ask, but I'm showing from .6 to 2.0 volts fluctuation on 5v standby.
                    See post #4 re startup capacitor underneath the heatsink.
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                      #70
                      Re: Memorex MLT3221 - No Power

                      With power off, check the resistance of this diode (D10) that I marked in this picture (RED BOX). it is standing up and connected to a heatsink. Check front to back then back to front. You should get low resistance one way and high the other. In my set, this is the one that went bad. It read around 5 ohms both directions.
                      From my research into this set, I found that the diode mentioned above would fail whenever someone would use this TV as a monitor on a computer. Basically a design flaw.
                      Attached Files
                      Last edited by Dgtech; 10-16-2011, 05:43 AM.
                      The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                      Comment

                        #71
                        Re: Memorex MLT3221 - No Power

                        Had already checked D10 out of circuit, it's fine.

                        Comment

                          #72
                          Re: Memorex MLT3221 - No Power

                          Instead of spinning my wheels troubleshooting individual components, I found the whole board available on shopjimmy.com for $70 and a few dollars shipping. It wasn't worth spending any more of my time checking caps in/out of circuit etc. The replacement board fixed it. If anyone wants my old board for parts (burnt traces, etc?) dated 2006, $20 and it's yours. I don't know what component is bad on it, but the largest cap on the board is very domed. On the new board, it's totally flat across the top. I suspect at the very least, that large cap will have to be replaced. -Web in Myrtle Beach

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                            #73
                            Re: Memorex MLT3221 - No Power

                            Those two, 10ufd and 22ufd both were both good. I also checked the nearby 47ufd cap nearby under the same heatsink while I was 'there', it's good too.
                            Last edited by johnnieboy2; 10-16-2011, 01:31 PM.

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                              #74
                              Re: Memorex MLT3221 - No Power

                              Originally posted by WY3XinSC View Post
                              Instead of spinning my wheels troubleshooting individual components, I found the whole board available on shopjimmy.com for $70 and a few dollars shipping. It wasn't worth spending any more of my time checking caps in/out of circuit etc. The replacement board fixed it. If anyone wants my old board for parts (burnt traces, etc?) dated 2006, $20 and it's yours. I don't know what component is bad on it, but the largest cap on the board is very domed. On the new board, it's totally flat across the top. I suspect at the very least, that large cap will have to be replaced. -Web in Myrtle Beach
                              That's a great way to go probably if you're certain all your problems rest ONLY with the P/S board. Alas I'm not certain, so $70 might just be the beginning for me...so on with the desoldering

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                                #75
                                Re: Memorex MLT3221 - No Power

                                Is there a 5v reg on this board? I don't recognize any of the marking on any of the devices as being std for a regulator.

                                Comment

                                  #76
                                  Re: Memorex MLT3221 - No Power

                                  Originally posted by johnnieboy2 View Post
                                  Those two, 10ufd and 22ufd both were both good. I also checked the nearby 47ufd cap nearby under the same heatsink while I was 'there', it's good too.
                                  Was your tests done with an ESR meter?
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                                    #77
                                    Re: Memorex MLT3221 - No Power

                                    Fluke 76, everything out of circuit.

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                                      #78
                                      Re: Memorex MLT3221 - No Power

                                      Originally posted by johnnieboy2 View Post
                                      Fluke 76, everything out of circuit.
                                      No Fluke multimeter can measure a capacitor's ESR. Some Fluke multimeters can measure capacitance, but a cap may have the "correct" capacitane, but have high ESR.
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                                        #79
                                        Re: Memorex MLT3221 - No Power

                                        Well, I can't put out the cash for the meter, that would outweigh my valuation of the TV and I don't expect to be able to use such a meter much in the future. Are there specific publications like the old Sams Photofacts available today for these TV's?
                                        Last edited by johnnieboy2; 10-16-2011, 05:33 PM.

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                                          #80
                                          Re: Memorex MLT3221 - No Power

                                          Originally posted by johnnieboy2 View Post
                                          Well, I can't put out the cash for the meter, that would outweigh my valuation of the TV and I don't expect to be able to use such a meter much in the future.
                                          Agreed. Then just change out those caps with something like Panasonic FC to rule them out as suspects. It shouldn't cost more than $2 USD for those 3 caps.
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