Question about Panasonic DMR-E55 DVD Recorder
My DMR-E55 has worked well for two years. It has recently developed a problem with powering down after about 30 seconds operation. If I switch the power off at the wall socket for 60 seconds and power up again, the unit plays ok again for a short period and then cuts out again. Everything goes dead including the display. I've tried this reset method several times and it is always the same. Any ideas what is wrong? I have tried resetting the unit to factory defaults and this has not cured the problem. The fault occurs in all modes of operation.
Changing IC001 fixed my problem with a DMR 55 -classic start-over symptoms slowly getting worse, although once the unit managed to start it would normally work okay except for occasional breaks during recording. Interestingly, it only struggled to start when a double-sided, cassette RAM disc (the ones like a big PC floppy disk) was in the drive. No disc, or a single sided non-cassette disc was fine ! Before changing IC001, I measured the DC voltages at the "ribbon" connector onto the main board whilst the unit was trying to start. Every time it failed, all the DC voltages disappeared suggesting that the Power Supply circuit was also completely shutting down, and reinforcing suspicions of a dodgy IC001. The Power Supply board was also quite badly discoloured under IC001 suggesting it was getting very hot. I noticed that at the points the heat sink is soldered to the board, the board was not at all discoloured suggesting that very little of IC001's heat was being dissipated in to the heat sink, but being conducted down IC001's leads (were the board was most discoloured). Like other's had commented, IC001 had no thermal grease between it and the heat sink !!!! I also extended the original heat sink by joining more aluminium I had spare, in an attempt to keep the replacement IC001 as cool as possible. Well done to everybody who did the "trail blazing" on IC001 !!!!
Posted on Aug 21, 2007
Amazing - I have exactly the same symptoms on my DMR-E55EB - noticed the dead machine on 19/11/6 - tried several powerdown resets, gained a few tens of seconds operation each time, and after around 6 attempts it died completely. Will open it up and have a look...
Posted on Nov 23, 2006
Diagrams/service manual for the DMR-E55 available as download from www.electronicrepair.org.uk
Posted on Nov 11, 2007
I have just fixed my E55EB by replacing the STR G6353 purchased from NIKKO and delivered next day. I removed both the 5 pin regulator and its heat-sink. Then removed an aluminum heat-sink from an old power supply unit which was attached to a similar chip. I then modified it by cutting down its legs to stand on the board at the back of the existing heat-sink. This also aligned the holes on them both. I then filed off the burr at the back of the hole on the existing heat-sink and made the hole the same size as the one in the new one. I put thermal paste at the back of the regulator and between the heat-sinks before assembling the unit with a bolt and re-soldering it onto the board.
An electronics book I purchased from Tandy describes the fitting of a regulator and states that both thermal paste and a substantial heat-sink should be used.
Having boxed up the E55EB I put it back under the television, plugged it in and it worked perfectly.
Posted on Sep 07, 2008
My E55 has just developed this exact same fault after nearly 3 years of service! Thanks Chipps for figuring out the cause - I was beginning to wonder whether or not to just tip the thing in the bin as I guessed Panasonic's service organisation would charge an arm and a leg to fix it. I'll be ordering the part from Nikko tomorrow and borrow my old man's solder pump!
Posted on Mar 13, 2007
I have had the same problem with the unit powering off while recording. I replaced IC001 and have also added an extra fan to the top of IC001 to disperse the heat off the IC. You can use any computer fan to fix this and just wire it in with the existing fan. Now it works great with no problems at all.
Posted on Mar 01, 2008
Hi, I wanted to put this as a comment to Solution #1. Thanks to everyone who has suggested the fix for this. I bought a replacement STRG6353 from Nikko (www.dalbani.co.uk) and replaced my IC1 on the power supply and my DMR-E55 DVD Recorder no longer keeps re-booting and going through the self check procedure. This web site is great, to be able to find a solution to my problem. Thanks again.
Posted on Sep 14, 2007
Hi thanks for the solution to my panasonic DMR-E55 and DMR-E85 dvd recorders. Both with the same blank screen powerdown cycle. I have followed the instuction you have given and Well done! it works a dream! I did the repair myself and desoldered the voltage regulators with the 5 legs off the board. i found it easier to cut the legs off first as the heat from the soldering gun was lost through the component.I also used sevisol heat sink paste. The circuit board did look a little overheated on the Dmr-e85 as the hard drive draws more power i fink.Well done for listing this fix as i have only had both units just over 2 years before the died. Thanks again Jez
Posted on Mar 02, 2007
Guys, This fix is brilliant!!! Mega kudos to the first person that sussed it out :o) Cured my DMR dubbing and self checking issues. In addition to replacing STRG6353, I've extended the heat sink, using part of a PC blanking plate that sits at right angles to the existing one. Just drilled a hole in the plate and attached using one of the free threaded holes on the heatsink. To improve airflow, I've increased the number of holes near the front of the chassis and added five more to the underside, around the area of the overheating. Four small self adhesive sound proofing pads have slightly raised the height of the unit, improving the airflow on the underside of the unit. Just stuck them on top of the existing 'feet'. It may be noted that I use a Hitachi Deskstar HDD, which is thinner than the original Maxtor. By using four standard screws on the underside HDD mount points, the HDD has been raised from the HDD chassis. This will also allow better airflow (hopefully). Many thanks for all your efforts - it has saved my prized DMR from taking a visit to the local skip! ;-) Though, I did pay £14 (delivered) for the STRG6353 - loose change to get it fixed, I'd say. Wish I'd discovered solder wick years ago! Best Wishes....
Posted on Dec 31, 2006
I have the exact same fault. It began last night & the unit is just over two years old!!
Posted on Nov 19, 2006
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