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What will be the problem when it is not showing power

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No power is a typical failure of the switchmode power supply, which, unless you have sufficient knowledge of this circuit, requires a workshop service centre repair. Several components, including the most likely culprits (electrolytic capacitors) will need replacing. In extreme cases, the entire PCB will need to be replaced.

Bad caps are usually very easy to spot in most power supplies, look for crooked, swollen or bulging caps, and/or splits in their vents (the impressions in the tops of them) along with electrolyte spilling out (electrolyte is highly corrosive, so if any has leaked out of any caps onto the PCB, it may damage the copper tracks). Some may have dropped in value, some may be open-circuit (no capacitance at all), while others may have taken out one or more IC regulator and/or the chopper transistor(s); this could lead to an expensive repair, particularly if surface-mounted components on the copper side of the board are short-circuited.

NOTE: when servicing switchmode power supplies, with electrolytic capacitors, it is standard practice to replace ALL the caps in this circuit to ensure reliability and to minimise the likelihood of a service recall later - even if the ESR of some caps measures OK, they should still be replaced, and in a lot of cases, the working voltages and values of those capacitors which are replaced may be uprated/increased.

As I said, unless you have knowledge (and experience) with this type of circuit, submit your unit to an authorised repair centre, get a quote on the likely repair cost(s) and/or a second opinion from an authorised technician as to the extent of the fault(s) in your unit, then make a firm decision afterwards as to what you want to do about it.

It's up to you - either spend a fortune in repairs to this one, or, if it is NOT a DVD recorder, buy a new player - but only as a last resort. I suggest that you get the repair quote first before going any further.

Posted on Mar 31, 2011

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