Polaroid FLM-373B Power LED but no picture, already tried replacing caps

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

    Originally posted by pattheslat
    On what, the "35419" of the part number? I just double checked and it is definitely a 35 there.
    Yeah, strange 3.5V regulator... not a common output voltage.

    Since you're in the USA: http://search.digikey.com/us/en/prod...ICT-ND/1301474

    is a good close replacement. 3.3V is close enough to 3.5V to most chips that it should not matter.

    This is also a part for part replacement, so the pins should match.

    plus about $3 shipping.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • pattheslat
      Member
      • Dec 2011
      • 25

      #22
      Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

      Thanks for all your help. I will try that part and see what happens.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

        I'm just a little baffled now about what voltage that regulator is supposed to output.

        It's definitely askew as 1.95V is no where near a standard voltage and most of these regulators seem to drop to around 2V when they fail.

        The "35" in the part code seems to indicate 3.5V, as the "25" is in the other part code does match the 2.506V output.

        Strange... Very strange. Does the regulator have any logo on it?
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • pattheslat
          Member
          • Dec 2011
          • 25

          #24
          Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

          Nope, absolutely nothing on it besides the numbers.
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

            I'm looking at the two resistors and thinking adjustable regulator but it still doesn't look right. Have you ordered the part yet? If not, hold off for a day or two for someone else to put their input in.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #26
              Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

              I'm reading the two resistors as 110 ohms and 61.9 ohms each. I put these into a calculator and get 2V output, which matches the measurement.

              So I'm not so sure if it is the regulator at fault. Can you double check pin #1 relative to the metal case of the TV, and then measure the voltage from pin #1 to the tab?
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • pattheslat
                Member
                • Dec 2011
                • 25

                #27
                Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                Sorry to not respond for a week, I moved to a new state and started a new job, so I haven't had any spare time.

                Now when I check the voltages, I'm getting .704 from pin 1 to the case, and -1.243 from pin 1 to the tab.

                Comment

                • Scenic
                  o.O
                  • Sep 2007
                  • 2640
                  • Germany

                  #28
                  Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                  that 1084 is a voltage regulator.. used as an adjustable version (2 resistors on the GND/ADJ pin)
                  I just came across an AMS1084CT in TO-220 a week or so ago and looked it up. That's why I remember this.

                  Searched for 1084PE and alldatasheet threw an APE1084P at me, which is available in TO-252 like yours.
                  http://www.alldatasheet.com/datashee...PE1084P15.html
                  Last edited by Scenic; 01-09-2012, 11:48 PM.

                  Comment

                  • pattheslat
                    Member
                    • Dec 2011
                    • 25

                    #29
                    Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                    Originally posted by Scenic
                    that 1084 is a voltage regulator.. used as an adjustable version (2 resistors on the GND/ADJ pin)
                    I just came across an AMS1084CT in TO-220 a week or so ago and looked it up. That's why I remember this.

                    Searched for 1084PE and alldatasheet threw an APE1084P at me, which is available in TO-252 like yours.
                    http://www.alldatasheet.com/datashee...PE1084P15.html
                    I'm having a heck of a time actually finding one for sale anywhere, googling just brings up data sheets. Any idea where I could find one?

                    Comment

                    • PlainBill
                      Badcaps Legend
                      • Feb 2009
                      • 7034
                      • USA

                      #30
                      Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                      Originally posted by pattheslat
                      I'm having a heck of a time actually finding one for sale anywhere, googling just brings up data sheets. Any idea where I could find one?
                      This is a 'jelly bean' part - available from a number of different manufacturers. The 1084 is the 'core' identifier. Any suffix identifies the output voltage and package. Each manufacturer uses a unique two or three letter prefix. Digi-Key has them in the AP (Diodes Inc) and LT (Linear Technology) prefixes.

                      There seems to have been a little confusion with what you are looking for, U13 is a 2.5 volt fixed output regulator, U33 is an adjustable output regulator, and as tom66 indicated, is PROBABLY bad.

                      Digi-Key AP1084DG-13DICT-ND at $1.48 is a replacement in the TO-252 package, AP1084KLDICT-ND is $1.63 in the TO-263 package; either compare datasheets or trust tom66.

                      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

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #31
                        Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                        Originally posted by pattheslat
                        Sorry to not respond for a week, I moved to a new state and started a new job, so I haven't had any spare time.

                        Now when I check the voltages, I'm getting .704 from pin 1 to the case, and -1.243 from pin 1 to the tab.
                        Hmm, my error. 1.243V is a good reading for this regulator (should be around 1.25V.) I guess we need to look elsewhere. Are there any regulators on the bottom of the board?
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • pattheslat
                          Member
                          • Dec 2011
                          • 25

                          #32
                          Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                          Originally posted by tom66
                          Hmm, my error. 1.243V is a good reading for this regulator (should be around 1.25V.) I guess we need to look elsewhere. Are there any regulators on the bottom of the board?
                          Finally got a chance today to pull that board out, there are no regulators on the bottom of it. So you're saying that regulator is ok?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #33
                            Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                            Originally posted by pattheslat
                            Finally got a chance today to pull that board out, there are no regulators on the bottom of it. So you're saying that regulator is ok?
                            Yes, it looks like it is. I'm kinda stumped right now. I'm not sure why it is not working. Have you got a 2.2k - 4.7k resistor? Maybe the PSU is at fault and that will allow a test.
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • pattheslat
                              Member
                              • Dec 2011
                              • 25

                              #34
                              Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                              Originally posted by tom66
                              Yes, it looks like it is. I'm kinda stumped right now. I'm not sure why it is not working. Have you got a 2.2k - 4.7k resistor? Maybe the PSU is at fault and that will allow a test.
                              I can get one. What test can be done with that?

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                                Check if the supply is turning on and then turning off. We can force it on by pulling PSON high or low.

                                Recently, I have dealt with an LG power supply which had bad caps. But even after replacing them all it continued to turn itself off. I later found it was the AC detect that was turning it off. Now I'm far more vigilant in testing this, as well as PSON.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                • pattheslat
                                  Member
                                  • Dec 2011
                                  • 25

                                  #36
                                  Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                                  Ok, I got some 3.3k resistors. Now what?

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #37
                                    Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                                    Sorry didn't see your post...

                                    I'm very busy now, will reply later after my exams.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271

                                      #38
                                      Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                                      Originally posted by pattheslat
                                      Ok, I got some 3.3k resistors. Now what?
                                      Probably something like posts #70 to #80 in a different thread, but same concept.

                                      https://www.badcaps.net/forum/showth...t=18382&page=4
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                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                                        What Retiredcaps said.

                                        If you post a closer up image of the connector going from power supply to main board we could deduce which pin needs to be pulled up (if it is labelled.) If it's not labelled (#*@$ Proview/Megmeet), then we may have to do some guesswork based on the power supply layout or the voltages at the pins.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

                                        • selldoor
                                          Slow Learner
                                          • Dec 2010
                                          • 7870

                                          #40
                                          Re: Polaroid FLM-373B Power LED but no picture, already tried replacing caps

                                          Hi I Think I have found the Power Supply Details.It has the pinouts.
                                          I will try and upload it. To read the PDF you may need to download the adobe chinese character reader. http://www.adobe.com/support/downloa...jsp?ftpID=4883
                                          Without it, it just shows as a blank page doesnt even show the english
                                          Attached Files
                                          Please upload pictures using attachment function when ask for help on the repair
                                          http://www.badcaps.net/forum/showthread.php?t=39740

                                          Comment

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