Powers on but immediately goes into protect and powers off

Receiver functioned fine for almost 2 years and now is powering off immediately like it is in a protect mode and the led by the power button flashes. It sounds like it is going to power up and as soon as you hear the "click" for the output mute it powers down. I am unable to measure the output on the transistors because it powers down right away.

5 Related Answers

Anonymous

3130 Answers

SOURCE: No sound from speakers

In most recivers or amps yes if there is a short in one channel all the amps go into shutdown or into the protect mode. Now if you know how an amp works then you should be able with a schematic to find out what amp is causing the over load simply by see in the schematic where the speaker output is on the curcuit and then measure for a DC B+ . Thats the amp you would disconnect to conferm that all the others were ok as an output on an amp curcuit shouldnt have more then .3 to .8 volts dc unless its unbalanced.. Seek a pro to assit you if you dont have the equipment to test the amp and for sure get a service manual or schematic diagram. Good Luck

Posted on May 16, 2006

Anonymous

119 Answers

SOURCE: Kenwood KR V8080 receiver

if you sent 110v down the speaker wires & into the amp you most likely have damaged the audio outputs or the output ic. Look for a big aluminum heatsing & on one side you may find 1 or 2 ic's or numerous transistors, the ic's are hard to check, the transistors are easier to check, if transistors replace in pairs. also check for burnt /open resistors near outputs

Posted on Nov 02, 2006

Anonymous

1067 Answers

SOURCE: Kenwood 1080VR - shuts down

try unpluging it all plug in sumware else see if it just turns on

Posted on Jan 27, 2008

Francisco Mauricio G

1551 Answers

SOURCE: Kenwood vrs-7100 surround sound receiver turns on and shuts off

The audio amplifier IC are fried

Posted on Aug 12, 2009

Anonymous

8546 Answers

SOURCE: Anyone know the protection reset button combo for

Plug it back in WHILE HOLDING the POWER key.

Posted on Mar 11, 2010

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If the protect function works but is causing you problems, cancelling the protection function should help, and it will be possible to enter the self-diagnostic function mode. This should disable all functions of the protection mode, excluding the 'excess electrical current detection' feature.

While pressing the "Tone Control" and "Info" keys, try pressing the power key to turn on the power. Keep pressing those 2 keys for 3 seconds longer.

this should activate the Self Diagnostic function, with your Protection Mode disabled.

in this mode the 'sleep' section on the tv's fluorescent display flashes to indicate that the mode is properly activated.

just be very aware, this function is normally there as a safety feature and i cant guarantee that disabling it altogether won't cause other problems down the road. best of luck!

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THE GOAL HEAR IS TO DETERMINE IF THE INSTALLATION IS CAUSING YOUR PROTECTION FAULT OR IS IT THE RECEIVER ITSELF HAVING INTERNAL DAMAGE. REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION (POWERS OFF), THEN THE RECEIVER WILL NEED TO BE SERVICED, AS YOU HAVE TOTALLY SIMULATED A BENCHED CONDITION THAT IS TOTALLY INDEPENDENT OF YOUR INSTALLATION. MOST TIMES, THE RECEIVE WILL GO INTO PROTECTION WHEN IT SEES AN EXCESSIVE LOAD WHEN TURNING UP THE VOLUME, WHICH IS USUALLY CAUSED BY TOO MANY SPEAKERS OR DAMAGED SPEAKERS, BUT IF NO SPEAKERS CONNECTED, THEN IT IS USUALLY BECAUSE THE RECEIVER SEES AN EXCESSIVE LOAD DUE TO ITS OUTPUT SECTION BEING DAMAGED. IN ANY CASE, ONCE REPAIRED, YOU MUST CHECK YOUR SPEAKERS FOR BURNED VOICE-COILS, WHICH WILL IMPOSE AN EXCESSIVE LOAD TO THE AMPLIFIER AND CAN CAUSE IT TO FAIL AGAIN. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

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First, disconnect all speaker wires from the unit and power it back up. If it does not go into protect. post a comment and I can walk you thru troubleshooting. If it goes into protect, it needs to be serviced.

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