Question about Cyberhome DVD320 DVD Player

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Replaced fuse and now the circuit seems to have blown

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  • Cyberhome Master
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I am not sure exactly what you mean here; do you mean the whole unit is dead? no functions? no front LED? If it is dead, the 'blown circuit' after replacing the fuse would be the power supply. Chances are, there may be several short-circuit/leaky components within this area.

IC regulators, power/chopper transistors, diodes (may be leaky or shorted), resistors (fusible and standard colour-coded types) may be open-circuit, and of course a whole lot of electrolytic capacitors may have leaked/failed. In other words, it could be an expensive repair job if you were to take it to a workshop and had them fix it. The most likely culprits in this instance would be the electrolytics; these capacitors may be poorly engineered. so they leak or burst their vents (the impressions in the tops of the caps split open and electrolyte comes out). When these caps fail, the subsequent result is increased DC voltage being passed through the lower output rails (due to decreased DC filtering) and they often take several other parts with them. Electrolyte is highly corrosive, so if any gets on to the copper side of a PCB, it will eat the track; which could render the entire board U/S. Let's hope that is not the case here, and hope the surface mounted components on that side are not affected in any way. It might be something simple, which a competent technician with adequate facilities and equipment can ascertain.

BUT - you can submit it to a service centre/workshop, and obtain a quote on the likely repair/parts cost first, this way you can make a decision as to whether it is economical/worthwhile repairing or not.

Or if you have some technical knowledge of basic circuits, you could probably opt to replace ALL the electrolytic capacitors (uprate their working voltages and values where necessary, whilst observing their polarity) and perhaps change the IC regulator(s) as required (assuming you can obtain the correct type and voltage rating of these). Don't forget to check the resistors and diodes for leakage (out of circuit if possible).

I have yet to find a power supply in any appliance manufactured recently with high quality low failure rated components on it.

If when you get the workshop quote on possible repair(s) for this unit, and you find it a tad high, consider cutting your losses and perhaps buy a new DVD player (or a recorder if you want one) with extended warranty - if you do; but only as a last resort.

Of course, all this is entirely up to you. The power supply is the main problem in this unit.

Posted on Mar 15, 2011

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