SAMSUNG DVD-VR320

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Can anyone please advise with regard to the Samsung DVD-VR320 unit.
The problem appears to relate to power supply as the unit remains dead no power light or indication, the fuses are servicable.
Any assistace relating to wiring diagram,voltage check points or known defects would be greatly appreciated.
Thank you in advance,
Colin.
 
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You don't state your qualifications or experience so I assume that it's none.

I've repaired plenty of PSUs - invariably without a circuit diagram. It's simply a matter of visual inspection (look for damaged components, dry joints, etc.) If there's no obvious damage and the fuse is intact, it's probably just a faulty start-up capacitor in the primary. If you don't have an ESR meter then simply replace ALL electrolytic capacitors in the PSU with low ESR types.
http://www.satcure.co.uk/accs/low_ESR_capacitors.htm

If that doesn't fix it, remove resistors one by one and measure them.

If the fuse has melted, remove semiconductors one by one, starting with diodes. Don't be satisfied to find just one because others could also be faulty.

This eBook has additional guidance.
http://www.the-cool-book-shop.co.uk/electronics.htm#repair

Note that, if you cost in your time, this type of repair is unlikely to make you any money. Indeed it's unlikely even to save you any money. If that's your aim, simply recycle it and buy a replacement. However, if you want to learn how to repair equipment then go for it. You could, of course, get lots of kudos if you succeed. You can put photos and details on a forum or on your web site. You could put a video on YouTube.
 
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Hi Sam, Thank you for your advice, I a retired aircraft electrician, my knowledge relates to aircraft and there components. It would be very useful to locate the power supply area on the DVD,I will take your advice and have a look at some relevant literature that you suggest.
Best regards,
Colin.
 
Locating the Power Supply is easy. Because of the high voltages on the mains side (up to 350 volts DC) it is often a separate PCB. If not then there will be some spacial separation evidenced, usually, by a printed line on the board.

Here's a page with some photos:
http://www.satcure.co.uk/gds200.htm

You'll notice that they all have a large electrolytic capacitor (the high voltage "reservoir" capacitor) and a small "switching transformer".
 
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Hi Sam,
The power supply is as you suggest protected by a fixed metal cover but is not on a separate board and to remove the board needs the removal of components like the VHS tapedeck etc. I have attached a photo incase you have any ideas on the stripdown.
Thank's
SAM_0705.JPG
 
SAM_0705psu.jpg

Measure the fuse "F". If open-circuit, there's a semiconductor fault which will be harder to fix.
The red arrow C indicates a capacitor that has overheated. It needs to be replaced but I doubt this will cure the fault.
The red circle indicates the high-voltage reservoir capacitor. Somewhere between it and the transformer (see yellow tape beneath the grill) is a start-up capacitor that might be the culprit.
 
Hi Sam, The 1.6 amp fuse is serviceable, well spotted regarding the capacitor. I will now attempt the removal of the board assy. The white flexible strips that connect the boards are these able to be unplugged or are they soldered ?
Many thanks for your help again.
 
I can see that the fuse is serviceable - it's in a clip.
You'll have to inspect the flexible connectors very carefully. There's sometimes a release mechanism.
 

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