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Blown caps in DVD player

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?

Pete

Reply to
Nospam
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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.

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Reply to
Sam Goldwasser

It's quite common on ' cheapies ' that when the caps initially start to fail, the supply rails go up to way beyond what they should be. This is due to the voltage regulation feedback that's often used on these switchers. When this happens, it almost invariably does damage to the LSI's on the mpeg board. In my experience, you've got about a 50-50 chance, depending on the regulator circuitry employed. Replacing the caps will almost certainly restore the PSU to working, but don't hold your breath that the rest of the machine will then work.

Arfa

Reply to
Arfa Daily

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

is

in the

Reply to
Russ_Verdon

Many thanks Russ and Sam for your comments and apologies for delay in responding as I was away from home with work. Will have a go at replacing them in view of what you have advised, nice site Sam will need to spend some time there. Again thanks for advice.

Pete

Reply to
Nospam

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