Question about Sherwood RX-4103 Receiver

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My rx4103 receiver shuts off after 3 secs even before sound is heard what should i do

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Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Posted on Mar 20, 2011

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Sounds like the wires touching shorted out one of the amp ic's. Would have to get that ic replaced before it will power up again.

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Disconnect speakers and wires. Bad wiring or defective speakers may be loading the amp down and causing the protection circuits inside to disconnect (no sound). If the HK is heating up (beyond what you perceive as normal) with no wires or speakers connected then you have a problem requiring expert repair.

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Sounds like you have a bad amp IC or transistors.
When these go bad they almost always put roughly 40 volts dc from the amp power supply to the speaker terminals. The protection circuit senses this dangerous (to your speakers) dc voltage and disconnects the speaker terminals from the amp via internal relays (the ones you hear click) and puts it into protect mode. If it didn't the dc voltage would quickly toast the voice coils of the connected speaker.

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It shuts off afer 5 seconds when powered on.


Does the unit output sound when powered on? If no sound can be heard, and you only hear a click after 5 sec. then your power circuit may have a faulty diode.

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My receiver shuts down frequently , wakes back after 2 or 3 sec .


do you have sufficient space around the unit? If it is in an enclosed space, has other components on top, etc, you may be overheating the receiver. Once it gets too hot it can potentially cause the issues you mention above.

If you have other components on top, try moving them to another shelf or below the receiver, and if you have a door on an entertainment center, leave the door open to help with air flow.

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Receiver shuts off abruptly when loud sounds are heard.


Are they new speakers you are using? some receivers have a overload seting so you don't mess up or blow anything, sometimes this can interfear with your music, etc..

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What is an output transistor?


output tranisister is the transister that give the finial output of sound.
some use a output IC for the same purpose.

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Start up it gets to receiver on the displayit shuts off and Power indicator starts fashion red to green


Having too loud sound cannot damage the unit, the loud maximum sound is design for that unit, when its brand new one or 2 years old its okey.But when 2 to 3 or more years when voluming the maximum the it create a vibration that cause the "solder crack" and results intermittent sound goes on, goes off, that is your problem. You open the unit and got to supply section reheat or resolder the resistor, capacitor diode, transistor and most of all switching IC. when finish, go to audio section, do what u did in the supply section.Bear in mind not tosolder it causes trouble. When reheat all the solder, your unit is good as new.

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