Question about Sony STR-DE945 Receiver

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My STR-DE945 5.1 channel, works "fine" just a small issue that started to bother me... when i start the thing the 5 speakers have sound (also the bass), but after like 5 or 6 minutes, i hear a clicking sound and then the 5 front speakers just shut off, and they have no sound at all, if i turn the device for a couple of hours, then they start with the sound again, this has occurred to me every day of this week... (10 march 2011) till today... now that the weather is a bit hotter, could it be that my device needs some inner cleaning? it has a dvd player sitting on top of it, but it is on a well ventilated space... I wanna know what to do... Every speaker works just fine for like 5 minutes, then the 2 frontal speakers just stop working after the Receiver makes a clicking sound

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Commonly your problem is a result in bad thermal connectivity on the power transistors.

Each power transistor is coupled to a heat sink with thermal paste / thermal conductor. When they run hot, they **** more power. There is commonly a thermistor which acts as a protection from blowing out the transistors.

There is probably a transistor that is nearing the end of its life. It will work for a while (when you power up the system) but after a couple of minutes, it starts to **** power, heat up, and trigger an thermistor up stream of the transistor, and it shuts the power stage of the amp off.

This is unfortunately a problem for a technician, or you would need to be armed with a schematic to be able to work with this problem effectively.

Posted on Mar 17, 2011

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