There is a problem for this receiver. When I turn on the power switch on receiver, stanby lamp shortly blinks once, but receiver is still off.
I searched forum site to fix this problem and common result was checking the protection circuit, mainly output transistor and the resistors, capacitors.
When I opened the receiver, I couldn't discriminate the protection circuit. But I can discriminate the elements such as transistor (BJT/MOSFET), resistor, capacitor and so on.
Which one is output transistor ?
Could you let me know which part is protection part ? Then I can check whether the circuit is shorted or not by myself using multimeter.
In addition, if any, could you give another cause for the problem ?
Because the warranty is over, I have to fix it. I don't want to pass it away.
Look for a large aluminum heat sink with the output transistors bolted to it. You should see anywhere from 4 or more large transistors bolted to it. I doubt that the protection circuit is malfunctioning. I would bet that it is doing exaclty what it is supposed to do. If you do find some bad output transistors, be sure to check all the components that work in conjunction with those transistors. Good luck.
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This could be caused by a direct short circuit on the speaker outputs. Try disconnecting all the speaker connections at the back of the receiver and then power back on. You can also try a factory reset by holding the surround mode + clear button for 3 seconds.
If the red led is blinking fast (8x/second) the power supply is likely damaged and the unit will need to be serviced. If blinking slow, the most likely cause would be a shorted speaker connection. To help find the cause, unplug everything including the power and speakers. Connect only the power and try to turn the unit on. If the light doesn't blink, you know you have a shorted connection. Power off and connect the inputs and then power back on. If the light is not blinking, you know the problem is with an output connection. Just find the bad connection by process of elimination.
You have an internal short in your receiver could be power supply or most likely a output transister. There is a code to the blinking red light check your manual it may list the number of blinks with problem. However its not a simple fix. plus make sure HDMI cable is unplugged when reseting receiver if this cable has a short it may cause it to. Sorry to hear the bad news, nice receiver
There is most likely a fault in the power supply that is causing the amplifier to go into protection. This receiver more than likely has a switching power supply you can tell by the weight of the amp. Heavy = linear power supply and light = switching power supply. Common problems with switch mode power supplies are the FETs used for switching and the PWM (pulse width modulation generator) If you know someone into electronic repair it should be too difficult. The FETs won't be cheap. Though. All in all the unit should be no more than 100 dollars to repair between labor and parts.
speaker terminal are short circuit,switch power off connect speaker properly then switch power back. -the ventilation holes of the set are blocked-turn power off and make good ventilation around leave the set to cool and turn power back. -the unit is operating at continuous high power turn it of and allow for cool down and switch it back.
This is the thermal overload for the amplifier section. unplug unit and check all speaker connections for a crossed wire. After all connections are checked and are in good condition, plug the amp back in and power up. Note: the polarity of the speakers when the wires are plugged in. Use the painted line on the speaker wire as a guide for which one is positive(+) and negative (-). If an amplifier is operated out of phase for too long ( positive and negative reversed), you can damage the amp. A bad speaker coil can cause the overload as well. If it still does it, disconnect all speakers and power it up. If these remedies do not solve it, you amplifier IC is shorted and needs replaced.
The trouble your describing tells me that theres a short in the output circuit of this unit. Unless you know how to troubleshoot solid state electronics, Please take to a pro to have it serviced , as there are no user serviceable parts inside this unit. Good Luck