Question about Harman Kardon DVD31 DVD Player

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Power suplly problem, i need to connect and disconnect many times

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If you constantly need to plug and unplug unit from a power point in order to get it to work at all, chances are the PSU is faulty, and the unit should not be used while in this condition. The usual suspects in any switchmode power supply circuit would be electrolytic capacitors (although in a lot of cases IC regulators play a role in partial or complete failures), you can easily tell which are bad just by visual inspection - bulging, leaky or crooked ones are the most obvious.

The best option is to adopt a blanket approach and replace every cap in that circuit (don't forget to uprate working voltages of each cap and where necessary, increase their capacitance values for assured reliability/safety - you need to be tech. savvy and be good with a soldering iron and various pieces of test equipment including ESR meters to measure the caps).

This should help, but if this does not fix your problem, or you have limited or no technical expertise, the unit will have to go to a service centre for further analysis/quote for more repair/parts by a qualified technician - the bad news is this could become very uneconomical in the long term; more than the player is worth new. But at least with a quote from a workshop you can make a decision on whether you want it fixed for the estimated cost(s) or not. It's up to you.

Personally, experience tells me that since this is not a DVD recorder with many elaborate features, it might be cheaper to simply buy a new one. The difference between the likely repair costs to fix this unit vs. a brand new one with a manufacturer's warranty could be very significant.

That's the trouble with 'budget models' they fail far too soon, while new ones become cheaper to buy, repairs to older units become more expensive, and there's little or virtually no chance of spare parts being available to fix such products.

However, you should only consider replacing the whole unit as a last resort - explore other avenues first to determine pricing/service cost differences.

Posted on Mar 24, 2011


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