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Power supply burned out (Model: ZN1792-F2)

The power supply has a lot of burned resisters that is not possible identify the values.
The ones are not possible to identify are: R23, R24, R9, R7. Can anybody help me on this?

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1 Answer

I have to identify power ic value


The power ICs are a known weak spot on these machines - replacements are often found on eBay, tagged with the model number. You could try this for your locale

Oct 22, 2013 | Panasonic DMR-E55 DVD Recorder

1 Answer

What capacitor do i need to replace the old ones in DMR-E85R to fix the problem with "please wait"


Best bet is to replace all of the electrolytic capacitors in the power supply one by one, noting original capacitance values, and voltages (capacitance values are marked in µF as well as their voltage on their jackets), uprating the value/voltage where necessary, and observing polarity (the negative pole is marked by a stripe down one side of the cap, and replacements should have this opposite the + symbol on the board) when fitting new ones in the PSU.

It may also require replacement of IC1, a 12V 5 pin IC regulator, since this may have been partially damaged by the increased output voltage of the failing electrolytic caps in close proximity to it. This device has its type number (prefixed by STR) on its face, and should be available from Panasonic. Make sure if you order a replacement, that it is for THIS MODEL only, and that it is for the power supply in this unit.

Before you go out and buy a whole bunch of new electrolytic capacitors (available from most electronics stores including Radio Shack etc), take a visual look at the power supply (unplug unit from power point, and carefully remove the power board.) Examine it carefully, and note each capacitor that you can the value/voltage of - write it down, and obtain the closest replacements of each. Don't panic if you can't get a 20V 680µF, use a 25V 1000µF instead.

The total cost depends on how many electrolytic capacitors require replacing, but it is best to replace ALL of them one by one, to ensure reliability of the circuit they are in, in this case, the power supply. Don't worry about the IC regulator or any other parts just yet, do the caps first, as these are not terribly expensive, before taking any further action.

Jun 25, 2011 | Panasonic DMR-E85H DVD Recorder

1 Answer

I have a Panasonic DVD Video Recorder model DMR-E85H manufactured in 2004. It has worked perfectly for all these years but now won't power up at all. I have checked the only fuse I could find inside...


The power supply board is the problem, one of the most common failure is the 1000uf capacitor "open" located near the power transistor that is heat sinked, value may be higher or lower with one or two caps, the second possibility is the power transistor may be open or shorted.

Jun 24, 2011 | Panasonic DMR-E85H DVD Recorder

1 Answer

Sharp dvd player does not come on even on standby although the power supply is on.


Pleasant day!

The problem could be the power supply or the main board.all you have to do is to follow this simple and easy way of troubleshooting.

  1. Remove the cover.
  2. Plug-in your DVD player and power it ON to perform a voltage data/check.
  3. Check the input power of the DVD.Use multimeter tester to test the AC voltage (AC range).It should have 120v or 240vac depends on the requirement of your DVD or the main supply that comes on the outlet.If no voltage reading,your power cord have a continuity problem.Replace it with the same type and A.W.G number standard.
  4. If the power cord got voltage reading.Next is test the output voltage of power supply such as 5vdc for the main board and logic supply using multimeter (DC range).If no voltage reading,the problem could be the power supply board.
Check the following parts which commonly breaks on power supply board.
  • The power transistors (regulators)-It is commonly binds on heat sink and found on the primary of the chopper.use a multimeter (range diode test) to check if it is shorted.
  • The fuse-able resistors-it is the resistor that have low resistance such as 1ohm 2.2 ohms etc.It is usually found near the power regulators/transistors.Use multimeter (range resistance) to check if it is open or change value.
  • The capacitors-it is the one who can store voltage.If you have capacitance meter you can test that,if none just look at the appearance of the capacitor if it is bulge on top or leak.
NOTE: If you found the defective parts that mention above,replace it with the same type and ratings.
When the problem is still there,The problem of the power supply is major and not for D.I.Y.I suggest to send it to the qualified technician or just buy a new one.

5. If the power supply have output voltage.The problem could be the main board and unfortunately the main board is not for D.I.Y because composition of the board is very sensitive.The only way to fix it is to buy a new main board unit.

I hope this solution could fix your problem.Please response if you have any comment and question.Thank you and good luck.

Apr 28, 2011 | DVD & Blu-Ray Players

1 Answer

Even when pluged in why won't it turn on?


hi...if you only find it hard to turn your player ON when plugged, lets do this few easy steps in tracing down the problem...check first the power cord if there's an indication of cut / burn wire.. if no check if there's a blown fuse...if there's one try to replace w/ same value..blown fuse sometimes caused by power fluctuation or you have a defective parts in the power supply section..in the power supply area check for any bloated or bulgy capacitors, if there's one replace w/ same value..also check the manual ON switch if it's still intact....test run....hope this help you...don't forget to rate and vote...good day..

Feb 15, 2011 | kawasaki DVD & Blu-Ray Players

2 Answers

I have no power getting into my dvd recorder. would it be the power supply to the unit is burnt out.


If you not getting any indicator at all, then the power supply is dead, if you get some indicator light and that all it does, then the 5v standby voltage circuit is OK but not the main power section. Look for bad filter capacitors that will have bulging tops.

Nov 01, 2009 | LG DR275 Recorder

1 Answer

Denon DVD 910 won't power up. Light goes off then on.


Possibly a power supply problem, not enough power.

Could be these:

- dried up filter capacitors (electrolytic) - these include: main filter capacitor (the biggest one),
any final filter capacitors at each voltage output section, also at the oscillator end.
Check for any blown up, leaked or (partially) shorted capacitors.

- burnt out components (resistors, diodes).
Replace these (assuming you can still determine the proper value or type).

- poor solder contacts.
Remove the old solder and resolder the pins.

Dried, leaked or blown up capacitors may cause the power supply to crash down (or cycle with very low power output).
Burnt out components may act as a short circuit line, a change in conductivity (resistance) or as an infinite resistance (open contacts).
Poor solder contacts (so called "cold contacts") originate from bad soldering (at the factory), being further loosened by component overheating and tensile stresses (moving your equipement from place to place causes the circuit board to bend a little bit each time, and this, in turn loosens the solder contacts even further, causeing more overheating which may melt the solder, and so on).
You can tell a poor solder contact from a good one: bad ones will have a circular crack in the solder around the pin - try moving the pin a bit with a pair of tweezers - if it moves, there's your bad contact (you'll need a good light source and possibly a magnifying lens to spot these).

hopefuly you can get closer to a solution using these hints.

regards

3rq8 (Triarcuate)

Jul 14, 2009 | Denon DVD-910 DVD Player

1 Answer

Power supply burnt


R106 is a .5 ohm. It is green,black,gold, and silver. I believe it is a 1/2 watt resister
R103A is a 27 ohm and R108A is a 470 ohm resister.I have no schematic.












.

Sep 22, 2008 | RCA DRC8335

1 Answer

Menu display3


its hard to help without the schematics have you tried a VR resistor where you can decrease the resistance gradually to try to achieve the required voltage? Thats what I try when I cant get schematics.

Mar 27, 2008 | DVD & Blu-Ray Players

2 Answers

Transformer


The Power supply was made to fail on this model. I would recommend using a Regular Computer Power Supply. It would cost $20 to $30 dollars for a brand new supply if you don't already have one to use.

Aug 24, 2006 | Apex Digital DRX-9200 DVD Recorder

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