Question about NEC VT460 Multimedia Projector

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Where is it

Where is the   secondry power area is this where the lampis placed

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No Sir, Main power supply has 2 portion, 1st is called primary and 2nd is called secondary. Primary power area is connected to ac oulet directly and secondry power area is isolated and source of power to projector circuits. Lamp power supply calls "Blast Power Supply" in projectors (Its very high voltage area). Please be careful while testing power supplies.

Posted on Jul 25, 2008


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Posted on Jan 02, 2017


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These sets opperate on what is called a switch mode power supply . that means that the power is electronicaly switched on inside the set after you push the remote or on button . A primary power circuit passes the current thrrough a series of rectifiers and transformers to control the smooth flow of electricty within the set , on the secondry side , the circuit alters the power again via transformers and circuit reducers to go to the different parts of the set the PSU is primarily a distributor .. the noise you can hear is probably the secondry side of the transformer oscilating due to a short or a component malfunction . the short can be in many places within the set especially within the High tension part of the circuit that generates up to 25,ooo volts in some cases per cathode ray tube and most Crt projection units have 3 Red Blue and Green that converge onto one spot to give the primary colours and the picture .
under each tube is the line output transformer this is responsible for generating the High tension it does this by means of an Oscillating transistor usually fitted to a large heat sink near the transformer if these go this will cause the type of fault you describe as the transformer trys to start a squeal is heard ( the tubes trying to charge ) and the set shuts down on most sets the sound circuit will be fed from one of these transformers and will fail at the same time and this is just one possible scenario .. I hope this helps you and must state that unqualified persons who remove the covers of live equipment are at risk of fatal electric shock .. and it is advised that no one without proper training should attempt this . Regards Vortash

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Thats ok, In my openion, projector has power supply problem. Please open it and check fuses in secondry power area. Atleast one fuse is open there.

Jul 25, 2008 | NEC VT460 Multimedia Projector

1 Answer

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Sounds like your lampis going out.

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