Question about Panasonic DMR-E55 DVD Recorder

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Releasing Ribbon Cable

Hi
Having read on your helpful site that the likely cause of my DMR-E55's powering down problem could be the V.Reg. STRG6353,. I'm attempting to remove the board but can't seem to locate the release tab on the ribbon connector( as described by 'Chipps') and as it seems fairly delicate I don't want to force it. I'm probably being a little dense here but can you give me anymore detail. Also I've read that a compound is recommended to aid with heat dissipation - Should I apply it directly to the component and is it costly? As you can tell, I haven't done this sort of thing for some time.
Regards
woboogie

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  • woboogie Apr 21, 2008

    Hi Palmbeach

    Many thanks for all of the advice. I managed to release the cable and followed your suggestions for removing the V.Regulator which I've replaced using the compound. I've put it all back together this afternoon but unfortunately I now have no display or signs of life in the machine, although power is getting to it. I've also checked the ceramic fuse and that's OK.

    I've taken it apart again to look for anything obvious and lightly re-soldered the V.Reg.but still no joy. I don't think I've damaged the print but I guess that could be the problem.

    Any other suggestions?

    Many thanks

    woboogie

  • woboogie Apr 28, 2008

    Hi Palmbeach



    Sorry for the delay as I've been away. Board still not working so I'm tempted to take you up on your kind offer - I'm in the U.K

    I assume you're in the USA. If you are still OK with this please confirm your whereabouts and I'll check out postage costs.

    Many thanks again for your time



    woboogie

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Hi

The ribbon is quite easy to disconnect. It is simply a push fitting. There are several ways to tackle it. Get a sharp pointed tool or large sewing needle. then carefully push it into one end of the connector at a right angle to the length between the join. If you use a magnifying glass, you'll see where the two halves of the connector join. You should be able to prise it up. Once it starts to lift, put your needle in the other end of the connector and lift that. It should pull away easily if you then put your finger and thumb at each end.

Regarding the heatsink compound. The reason for using this is to assist with heat dissipation. The idea is that it fills imperfections in the two surfaces that are pressed together, namely the regulator and the heatsink. This allows the heat to transfer more efficiently. Most people use far too much compound. All you need is a very thin smear on both surfaces before you press them togther. If you use more than that it will not make it more efficient, it will just make a mess.

Personally, I always fit an extra heatsink on these units.

Be very careful when removing the old component. I recommend using a pair of miniature wire cutters to cut the pins of the old regulator. Then remove the pins carefully from the board. The print will easily lift away from the board if you are not careful. It isn't a disaster if this happens but you want to try and avoid damaging the print if you can. Make sure the holes are nice snd clear before you fit the new regulator. Again a sewing needle is quite useful for this and less stressful to the print than solder braid or a solder ******. Also make sure the regulator is locked down tightly when you have finished. Again, just a thin smear of compound is enough.

Compound is not expensive, but you'll buy a tube, use a tiny bit and probably never need it again. If you have an engineer friend he or she may be able to help. Alternatively, take a look on eBay for the cheapest you can find.

Hope this helps, have fun and take care..

Posted on Apr 18, 2008

  • Palmbeach
    Palmbeach Apr 21, 2008

    Hi woboogie



    I'm really sorry to hear that. Unfortunately, although it's not a particularly difficult job for an engineer, if you have never been involved with this kind of work before, I can see how you can run into trouble.



    Firstly, retrace your steps. Pull out the power board again. Take a close look at the print with a magnifying glass. Make sure that you haven't bridged anything or splashed solder across the printed tracks. Then, I would recommend using an old clean tooth brush to lightly brush the back of the board where you have soldered.



    Carefully put everything back and double check that the ribbon is back in place correctly. It doesn't sound as though you have short circuited anything or the fuse would have blown. More likely, something isn't connected properly. Where abouts are you? If you are happy to cover the postal costs and can send me the board in a Jiffy Bag, I would be happy to take a look.



    Regards


  • Palmbeach
    Palmbeach Apr 28, 2008

    Hi again



    I'm in the UK too. Please email me direct



    helenjay1-nsw@yahoo.com.au



    If you sandwich the board between two pieces of card, foam or polystyrene, then pop in a Jiffy bag, Recorded delivery should only be about £2.50



    Cheers

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