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Sony davs 500

My sony davs 500 has just gone dead.. No power at all no lights on. Took case off and internal fuse still ok.

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  • jude35 Nov 09, 2008

    Hi again they is no lights on at all and the internal fuse that is still ok is F901

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Does its standby light lit?
Can you mention what fuse you checked and found OK. Please write fuse circuit number like F600, F201 etc

Posted on Nov 08, 2008

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1 Answer

Sony DAV-FC7 won't power on. I bought it new and have only had it for about 2 years.


I suspect you might have a power failure caused by an internal fuse. Fuses rarely just go on their own, so it might be caused by an overload, generally caused by a faulty output device.
If you have any knowledge to repair one or no someone who has you can or they can look around inside. Otherwise it's off to the repair shop with it. Unless you have a five year warranty on it or have paid for extra cover, then you will be liable for the full cost of the repair. If you have a five year cover or extended plan, contact the manufactory or the service plan provider. But do NOT open the unit yourself.

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check if power supply is ok and cable securely connected.
check if the power switch is ok - sometimes it takes several attempts to power on.
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Two thing here.
#one the internal fuse has blown unlikely as the standby light is powered.
Two the power supply unit or switch is faulty.

get some one electrical component with the unit unpluged open the case and check any internal fuses have not blown.
Two check capacities on the power board these are large cylindrical shaped objects. These can dry out and or exploded if faulty relatively cheap to replace.
Second check the power switch actual powers the unit again someone with a multi meter and electrical compertent.
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Andrea my sony dav-dz260 will not turn on , fuse in plug is ok small fuse on power board ok power all over three circut boards but will not light up


In this case what is required is a probe using a multimeter and you must be technically inclined to check this out. Please be careful not to short and unless you are confident to use a multimeter with the selected range to check for the Secondary LT voltages to the circuit , it is not recommended.
If you can get a tutorital on use of multimeter, you can start from the secondary power supply , check out each sections of the DC outputs to the respective board .
If power seems good then you need to know the basics of the block sections of the amplifier to proceed further so as to identify.

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Turn off your unit at the power button. Check speaker outputs for a short circuit - also check other end of speaker cables for a short. If you can't find an obvious problem then disconnect all speakers and power up the unit. If all is OK then connect speakers one at a time (this should be done with the unit powered OFF) and power up after each conection. This should identify which output is causing the problem.

If that does not work then it's an internal fault that will require a service engineer to identify - but I hope that is not the case!

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dead short. Check wiring inside case. Power Protect keeps it for catching fire or electrical shock. Tech Fix only in most cases.

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Open it up and check the main fuse. It is located on the board where the wall plug enters the chassis.

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I am having this same problem. I have checked all fuses and all seem ok. Does anyone know what else might be keeping this from powering on? Any common problems that this one had to cause this? Also does anyone have a diagram of the schematics or the service manual?
Thanks in Advanced.

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try to identify the location of fuse and try to change.

Jul 12, 2007 | Sony DAV-BC150 System

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