Re: Blown caps in DVD player

I repaired a discarded DVD player from the roadside. It had the blown caps
on the smps secondary scenario. I also found shorted diodes on the secondary
and a shorted zener all in the Power Supply.
The unit worked after replacing these.

Russell

"Sam Goldwasser" <sam@xxxxxxxxxxxxxxxxxx> wrote in message
news:6w3bh5dn8o.fsf@xxxxxxxxxxxxxxxxxxxxx
Nospam <Pete@xxxxxxxxxxxx> writes:

Have a DVD5052M DVD player that was powered up when it was found to be
dead. Power checked was ok, last used a couple of months ago. Opened and
found two caps had exploded with contents/foil spread across SMPSU
board. Likely that I can identify them from the remains so as to replace
them.

Question is in view that power was still on (fuse appears ok) and the
foil found between other components what is the likely hood that
replacement of the caps would restore functionality or would it be more
likely that other damage has occurred?

If repair is considered feasibility, apart from replacement of one with
a slight bulge on the top what other checks can I carry out on in situ
caps?

Check semiconductors for shorts, low value resistors for opens, and wish
yourself luck. :) If it's like the one I just repaired that had a bulging
high ESR cap, there are only a very few semiconductors, maybe an 8 pin
IC that's the actual switching component.

See the SMPS repair guide at the site below.

If the power supply unplugs from the DVD mainboard, it might be worthwhile
to test it first with dummy loads to make sure it's properly regulating
once the bad parts are replaced.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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