My PANASONIC DVD/VCR player blows fuse..

[headman333]

I have this PANASONIC DVD/VCR player which worked well overtime but then suddenly its fuse in the power supply section blows. I tried to look for any burn inside the unit but I found none, every parts looked OK. But, everytime I replace the fuse, when I plug in the power socket to the outlet it always blows the fuse. I don't have any idea where is the problem on my DVD/VCR player.

 

[BradtheRad]

The first thing to look for is a shorted capacitor or shorted diode in the power supply. Not easy to track down.

You need to use a ohmmeter which sends less than 0.6V out its leads, so you don't cause neighboring diode junctions to conduct and give misleading readings.

Is the power supply a switching type? With miniature components? Then it will be hard for you or anyone else to work on.

A technician would probably say "Right off the bat I'll offer to test it with a new power supply. If it solves your problem the charge will be $50. If your power supply is good then I can try to diagnose the problem but my time will cost more than the unit is worth. "

If you feel like doing some hazardous experimenting on your own, try installing a variac to reduce power voltage (or add a light bulb inline). Bypass the fuse with a jumper wire.
Then:
* See how much current the unit draws.
* See if you can feel a component heating up.
* See if you can figure out if any board is drawing overmuch current.
* See if the display works.
* See if the tape drive works.
Etc.
Watch that power draw doesn't go over a few watts, lest you risk ruining the unit or causing a component to explode.

Even if you can track down the section that's faulty, to fix it will not be easy unless you have an identical spare from another Panasonic unit.

 

[DIDAKE]

PANASONIC DVD/VCR model ? I have schematics

 

[headman333]

Can you send me the schematics?

---------- Post added at 01:36 ---------- Previous post was at 01:34 ----------

the model is LSXK0100.

 

[DIDAKE]

¿Lsxk0100 is a internal dvd for cpu ?
Only have schematic for home dvd player

 

[headman333]

This the model no. PV-D4732. If you have this can you send or post it here?

 

[DIDAKE]

Service ManuaL for you.
Schemes in the content of the file.
Always work with caution.
Regards

 

[headman333]

Thanks much DIDAKE...This is helpful!

 

[Tipu606]

a blown fuse indicates that bridge rectifier may be shorted or the oscillator transistor may be shorted in SMPS type power supply