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    #1

    Polaroid *cough* TLA-01511C EPC-19 and Inverter question

    Cliffs: is 660 Ohms secondary resistance OK for EPC-19 transformer?

    Non cliffs:

    I was given one of these units to try and fix. It was doing 2 sec then off so I cracked it open and you guessed in. HEC and ProCon caps almost every one bulging.

    I replaced all but 2 little ProCon's with Rubycon PX, ZL, and one MCZ. Just haven't gotten to the last 2 little ProCons. Right now I'm waiting on new CCFLs to replace the very badly burned tubes that were in there. So since I have it apart I decided to check the secondary transformer, an EPC-19. The reading across the primary is 1.5 Ohms but the secondary is 660 Ohms (in circuit); which is lower than the ~1kOhm for another LCD I was working on. Is that a reasonable reading for this transformer or potentially suspect?

    I tried finding a data sheet for it but all I can seem to find are ordering pages that list dimensions and mounting options, but no detailed technical data.

    If anyone has any ideas I'd be most appreciative to hear them. Even if it's telling me I shouldn't have used Rubycon PX or ZL for this (I didn't know to check ESR and compare series etc.)

    Thanks in advance!
    Last edited by BarrelRoll; 01-20-2011, 09:07 PM.
    Tags: None
    #2
    Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

    Originally posted by BarrelRoll View Post
    The reading across the primary is 1.5 Ohms but the secondary is 660 Ohms (in circuit); which is lower than the ~1kOhm for another LCD I was working on. Is that a reasonable reading for this transformer or potentially suspect?
    660 is reasonable. Not all transformers will measure 1000 ohms.
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      #3
      Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

      Excellent, thanks!

      Comment

        #4
        Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

        Originally posted by BarrelRoll View Post
        Even if it's telling me I shouldn't have used Rubycon PX or ZL for this (I didn't know to check ESR and compare series etc.)
        PCBONEZ explains it here ...

        https://www.badcaps.net/forum/showpo...30&postcount=7

        PS. Post a picture of the boards so we have a reference for future. Please post using the manage attachments button and do not post inline.
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        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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          #5
          Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

          OK here's after the recap. Received new CCFLs yesterday, soldered everything up and still getting 2 sec and off sometimes, then sometimes the backlights restart, eventually though I started hearing buzzing or arcing coming from somewhere and an ozone like smell so I pulled the plug. Time to recheck my soldering work and take the panel back apart.
          Attached Files

          Comment

            #6
            Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

            Originally posted by BarrelRoll View Post
            OK here's after the recap. Received new CCFLs yesterday, soldered everything up and still getting 2 sec and off sometimes, then sometimes the backlights restart, eventually though I started hearing buzzing or arcing coming from somewhere and an ozone like smell so I pulled the plug. Time to recheck my soldering work and take the panel back apart.
            Ozone smell = arcing.

            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

              #7
              Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

              Hi, not to thread jack but a quick question for BarrelRoll.... When you ordered your CCFLs do you by any chance know what diameter they were or would you be kind enough to point me in the direction of where you ordered them? I have replaced CCFLs before but I can't find anything on the size used in the TLA-01511C.

              Comment

                #8
                Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

                I ordered them from http://www.ccflwarehouse.com/ The size I came up with was 2 tubes of 2.0mm x 334mm. If you want to get an assembly, it's figure 5 for the wire layout.

                As a note of caution, there's a nearly invisible clear plastic retainer/spacer in the middle of the reflector tray that holds the tubes that I didn't see, and ended up breaking both the tubes in half when I tried to remove them. So keep an eye out for that. Be extra careful removing the end caps. Both of mine disintegrated when I tried to remove the old tubes.

                Comment

                  #9
                  Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

                  Awesome, thank you very much for the information! That is very useful and I appreciate the tip in the retainer.

                  Comment

                    #10
                    Re: Polaroid *cough* TLA-01511C EPC-19 and Inverter question

                    No problem. Good luck!

                    Here's the original electrolytic cap list from the PS:

                    ProView
                    PI-XXXXTLTX Version:A
                    200-001-XXXXTLTX-AH
                    DTAE: 2007/09/27

                    w x h

                    1x HEC 1500uF 10V ZM Series 105C CV40 10mm x 17mm
                    2x HEC 470uF 25V ZD Series 105C CV39 8mm x 16mm
                    4x HEC 1000uF 25V ZP Series 105C CV42 10mm x 20.5mm
                    1x ProCon 470uF 25V EY Series 105C (M) 10mm x 17mm
                    2x ProCon 680uF 10V EY Series 105C (M) 8mm x 16.2mm
                    1x HEC 10uF 50V ZP Series 105C CV39 5mm x 11mm
                    1x ProCon 22uF EY Series 105C (M) 5mm x ~11mm
                    1x HEC 100uF 400 V ZT Series 105C CV34 18mm x 33mm

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