Question about Panasonic DMR-E55 DVD Recorder

4 Answers

No 7.5V supply to fan

After replacing IC001 machine functions perfectly (using temporary cooling)
Circuit Info required re source of 7.5 fan supply.

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  • vk101 Dec 08, 2007

    I have the same issue, my fan not running on when unit is turned on, it works when removed and 7.5v is applied.Suspect no power being supplied, is this due to the IC001 ?

  • maintman84 Dec 09, 2007

    I would not think fan not working was anything to do with IC001 since recorder works perfectly with external fan positioned over grill after internal fan is removed (for prevention of other overheating damage). The guess is that there is a dedicated 7.5v regulator which caused a lack of cooling. Maybe IC2 this could be established instantly from a curcuit diagram!!!



    maintman84

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Palmbeach has the correct diagnosis. The heat sink fitted to the IC001 is not adequate. I have removed screw and fitted an additional heat sink to the FRONT of the IC. The original heat sink is fitted to the BACK. Put a spot of thermal compound on the front and back of the IC.The additional heat sink is made from a piece of aluminium strip 30 mm wide and cut to 65mm (or there abouts) long. Cut two slots to clear the original heat sink where it is bent round at either end. The strip is 2.5 mm thick. Remove the self tapping screw and replace with a longer machine cut screw and a nut. This allows you to get the correct tightness. You will have to drill out the hole in the present heat sink slightly so be very careful.
When testing the repair put the cover back on so that you get the correct air flow from the front of the case out through the fan.
As Palmbeach has said the fan is thermostatically switched and does not run all of the time. This mod can be done with the minimum of change to the original. About 20 minute task if you have the tools. Thank you Palmbeach

Posted on Feb 06, 2008

  • dengle Feb 11, 2008

    It very much depends on the ambient temperature around the recorder. If it is in the sun, near the heating radiator or in a cabinet with other equipment you can expect it to start immediately. if it is sitting in an ambient of 20 centigrade or less it may not start immediately and it can take between 10 to 20 minutes to start in record mode.

    Dengle

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I agree with Palmbeach - The PSU board contains a number of Thermistors which are devices that change their resistance with temperature, therefore when the unit gets warm enough to warrant the use of the fan it will power up !...Revieski

Posted on Jan 09, 2008

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Further to my first posting, my brother has the previous modele recorder his fan comes on as soon as the unit is switched on I was assuming the later model would do the same, can anyone confirm this ?

Posted on Dec 26, 2007

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Before pulling out components, take into consideration that the fan does not necessarily operate as soon as the unit is powered. It should operate when the unit has been switched on for a while. Regarding IC001, I have long felt that this component should be bolted to a proper heatsink and fixed to the inside of the cabinet with a suitable insulator. DO NOT DO THIS WITHOUT A SUITABLE INSULATOR. The cabinet would make reasonable heatsink and IC001 would only get marginly warm.

Posted on Dec 26, 2007

  • Palmbeach
    Palmbeach Dec 26, 2007

    The fan is thermostatically controlled. In other words, it should only operate when the temperature reaches a set level. If it operates as soon as the unit is switched on, it can only mean that the unit is in a very warm place like adjacent to a heating radiator, or that the thermostat is either out of tolerance or could even be short circuit. The E55 will generate a little heat even in stand by, so first, I would ask your bro to check that the vents are not being obscured. Also, run you own machine or a while and see if your fan eventually operates. It probably will.

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Vehicle: 1998 - 1999 Dodge Durango 3.9L
2000 - 2001 Dodge Durango 4.7L
1998 - 2000 Dodge Durango 5.2L
1998 - 2001 Dodge Durango 5.9L



Symptom: Engine will not start. Gauges are inoperative. No BUS message displayed on odometer.



System: Body/Chassis Electrical, Emissions/PCM/Fuel, Engine Electrical



Codes: N/A



Problem 1 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Crankshaft Position (CKP) Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) sensor. If 5v is not present, unplug the Crankshaft Position (CKP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CKP sensor.



Problem 2 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Camshaft Position (CMP) Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the Camshaft Position (CMP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CMP sensor.



Problem 3 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Manifold Absolute Pressure (MAP) Sensor.



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Problem 4 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Throttle Position Sensor (TPS).



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Problem 5 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted wire.



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Problem 6 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Governor Pressure Sensor.



Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the large round connector on the driver's side of the transmission. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, remove the transmission pan and check for shorted wiring inside the transmission. If the wiring is OK, replace the Governor Pressure Sensor.


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Hi Dengle

The heat is caused by IC001 which is a regulator that is mounted on a completely inadequate heatsink on the power board. This component gets very hot during normal operation.

The regulator will usually last a couple of years, depending on how often the machine is used and then start playing up. The symptoms are intermittent operation, continuous self checking and rebooting, not being able to read discs and so on.

Eventually the component can short-circuit, burn out and take other components with it. The on-board fan is thermostatically controlled. It does not operate all the time, only when the unit gets hot enough. By using an external fan, you are keeping the unit cool enough for its own fan never to cut in. The additional cooling is probably squeezing a bit more life out of the regulator and is stopping its own fan from operating.

I have repaired lots of these and have never found a faulty fan, or fan switching fault. There's always a first time of course.

It is more likely that the regulator IC001 is faulty and if you are technically skilled, I would suggest you seriously consider replacing it. Use some heatsink compound and an extra heatsink, and it will probably do the trick. The regulator is an STRG6353. You can get these easily online from a number of outlets. Don't attempt a repair if you are unsure of what you are doing. Regards..

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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...

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