Memorex MLT3221 - No Power

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  • johnnieboy2
    Member
    • Oct 2011
    • 42
    • USA

    #121
    Re: Memorex MLT3221 - No Power

    Well, I disconnected the CON3 plug to the board and I get the 5vdc solid as can be. The connector has other voltages listed but since the set is not turning on maybe that's the reason, anyway no other voltages present. ARGGGGGGGG! Maybe my power supply board was good all the time!

    Comment

    • johnnieboy2
      Member
      • Oct 2011
      • 42
      • USA

      #122
      Re: Memorex MLT3221 - No Power

      Any suggestions?

      Comment

      • PlainBill
        Badcaps Legend
        • Feb 2009
        • 7034
        • USA

        #123
        Re: Memorex MLT3221 - No Power

        Originally posted by johnnieboy2
        Any suggestions?
        Hopefully you can wing this one on your own. The logical assumption is there is an excessive load on the 5 volt rail on the main board. Try to verify this. Then it becomes a matter of tracing the 5V rail on the main board.

        Also, earlier I had noted that there are a pair of power FETs on the cold (output) side of the power supply. Presumably these control the missing voltages. If I recall, there was an obvious control line to turn on these voltages. Do that by pulling the line to 5 volts through a 3.3K resistor.

        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

        • johnnieboy2
          Member
          • Oct 2011
          • 42
          • USA

          #124
          Re: Memorex MLT3221 - No Power

          Think I'm throwing in the towel, without a schematic this is just a shot in the dark. Thanks for all the help, much appreciated.

          Comment

          • Dgtech
            E. Technician
            • Apr 2009
            • 1462
            • Steeler

            #125
            Re: Memorex MLT3221 - No Power

            If it's the power board that is giving you problems, try to find it on ebay. I just found one for $40 for a similar set. I've been messing with this set for about 6 months now, off and on. It finally came down to a transformer that I found was arching and making an audible arching sound.
            The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

            Comment

            • johnnieboy2
              Member
              • Oct 2011
              • 42
              • USA

              #126
              Re: Memorex MLT3221 - No Power

              If I had any indication of life in this thing, I'd probably continue on. I bought the capacitor kit at ebay and nothing but 5v. Then I saw another kit there that said..."if you bought the cap kit and only get 5v now, buy 'this' kit...for more money than the first one. I thought that was pretty funny...this thing could easily be a money pit. Nothing ventured nothing gained, but this venture has gone far enough. Thanks again.

              Comment

              • Dgtech
                E. Technician
                • Apr 2009
                • 1462
                • Steeler

                #127
                Re: Memorex MLT3221 - No Power

                If you feel like searching through schematics... here is a polaroid site that has some service manuals. A few of these sets have the same IPOS 150 power board, I think.

                http://www.polaroidsupport.com/polaroid/en_us-sm.html

                If you search around, you'll find out that this IPOS 150 power supply is found in many sets.

                Memorex, Polaroid, Element, and a couple others.

                This service manual is for one of the sets with this type of power supply but as you'll see... it does not have details on the board.
                The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                Comment

                • johnnieboy2
                  Member
                  • Oct 2011
                  • 42
                  • USA

                  #128
                  Re: Memorex MLT3221 - No Power

                  Thanks, already looked there

                  Comment

                  • mattmarkgo
                    Member
                    • Nov 2011
                    • 15

                    #129
                    Re: Memorex MLT3221 - No Power

                    need help!!!good day i have mlt3221 when i plug it i see red led light after a second it goes blank....

                    Comment

                    • Dgtech
                      E. Technician
                      • Apr 2009
                      • 1462
                      • Steeler

                      #130
                      Re: Memorex MLT3221 - No Power

                      Did you check the things that were mentioned in the first few pages of this thread? If you've done this already and you still need more advice, post pictures of your power board and we'll go from there.
                      The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                      Comment

                      • mattmarkgo
                        Member
                        • Nov 2011
                        • 15

                        #131
                        Re: Memorex MLT3221 - No Power

                        i already cheack 5volts,12 volts ok....

                        Comment

                        • mattmarkgo
                          Member
                          • Nov 2011
                          • 15

                          #132
                          Re: Memorex MLT3221 - No Power

                          thanks in advance.....
                          Attached Files

                          Comment

                          • mattmarkgo
                            Member
                            • Nov 2011
                            • 15

                            #133
                            Re: Memorex MLT3221 - No Power

                            24 volts ok,when i plug i see a red light i a seconds black screen......

                            Comment

                            • mattmarkgo
                              Member
                              • Nov 2011
                              • 15

                              #134
                              Re: Memorex MLT3221 - No Power

                              any suggestions please!!!!!!!

                              Comment

                              • Dgtech
                                E. Technician
                                • Apr 2009
                                • 1462
                                • Steeler

                                #135
                                Re: Memorex MLT3221 - No Power

                                what are the voltages that you see all the way across the output connector - in order?
                                The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                                Comment

                                • mattmarkgo
                                  Member
                                  • Nov 2011
                                  • 15

                                  #136
                                  Re: Memorex MLT3221 - No Power

                                  they have pin1-3v, pin2-5v, pin3-5v, pin4-11.5, pin5-o, pin6-0,pin7-0v,pin8-0v, pin9-23volts in con3,


                                  connector4
                                  pin1 - 3volts
                                  pin2 - 0 volts
                                  pin3 - 0volt
                                  pin4 - 0volt
                                  pin5 - 5volts
                                  pin6 - gnd...
                                  Last edited by mattmarkgo; 11-14-2011, 11:38 PM.

                                  Comment

                                  • mattmarkgo
                                    Member
                                    • Nov 2011
                                    • 15

                                    #137
                                    Re: Memorex MLT3221 - No Power

                                    result of ic2#52722
                                    pin1- 0V
                                    pin2- 7V
                                    pin3- 9V
                                    pin4- 0V
                                    pin5- 14V
                                    pin6- 4V

                                    Comment

                                    • mattmarkgo
                                      Member
                                      • Nov 2011
                                      • 15

                                      #138
                                      Re: Memorex MLT3221 - No Power

                                      resistance to hot ground to pin 1 of IC2 is shorted....need help.......please!!!!!

                                      Comment

                                      • Dgtech
                                        E. Technician
                                        • Apr 2009
                                        • 1462
                                        • Steeler

                                        #139
                                        Re: Memorex MLT3221 - No Power

                                        I'm looking around for IC2 but I cannot find it on your picture. Please specify. Also, I recently got a similar set working after I found the transformer above the main cap to be bad. It was arching intermittently. Whenever the set would fail, the LED on the bottom left hand side would come on. I had to replace the whole board cause there were no replacement transformers to be found for this board. Good luck.
                                        The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                                        Comment

                                        • kobkobk
                                          Member
                                          • Sep 2011
                                          • 28

                                          #140
                                          Re: Memorex MLT3221 - No Power

                                          dear sir
                                          i also got this problem at this power supply
                                          i have checked all the outputs at con3 the tv power on for 2sec and shot off.
                                          at ic8 pin 14i connect 12v constant the back light was on at half power
                                          any suggestion?
                                          thanks
                                          kob

                                          Comment

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