Got the same problem and did some searching. Strange thing is that next day the amp works fine. This is what I found on http://www.forums.hcsd.com.au/Blah.pl?m-1210733289/s-8/
SYMPTOM: The power cannot be turned on, or the protection circuit is activated to turn off the power. CAUSE:
Fluid leakage occurs from the backup capacitor C633 0.047F 5.5V (C662
in the case of RX-V3000/DSP-AX2) on the Function PCB and causes a short
with the adjacent components and between patterns, resulting in
operation of the protection circuit. Fluid leakage tends to occur with
this capacitor particularly with high internal cabinet temperatures,
with or without the power on. Often, the leakage is only visible with
very careful inspection.
SOLUTION: Two types of backup
capacitors are now available with a longer expected service life. When
servicing, thoroughly clean the leaked fluid from the PCB and from
under any nearby components before replacing the capacitor. There are
models other than those mentioned above that use the subject backup
capacitor. Check them for fluid leakage and replace the capacitor as
needed. PART(S): Old Ref. No. Part No. Description Remarks C633 or C662 VT740700 V3860300 ELECTROLYTIC CAP 0.047F/5.5V Vertical type * VU545000 ELECTROLYTIC CAP 0.047F/5.5V Horizontal type New Ref. No. Part No. Description Remarks C633 or C662 WD294400 ELECTROLYTIC CAP 0.047F/5.5V Vertical type * WD292000 ELECTROLYTIC CAP 0.047F/5.5V Horizontal type
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check ur speaker wires, try disconnect all wires from back of unit and then try to turn on unit . if it stays on whit no wires attached than u have short connection at speaker wires . if doesn`t come on then try to fasten screws at back of the unit , may sound like BS but if amp board don`t have good ground connection it can go in protection mode happened to me on RX-V592
Generally speaking, an amp attempts to protect 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 'nekkid'. 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.
When you turn it up do you hear the relay or a clicking sound, then you turn it on and it comes back below the +2db?
Try unplugging All the speaker wires from the unit. Turn on the unit and listen for the click. after the click, turn it up past the 2+ db mark and see if you hear it click or shut down. If it did not click off, then suspect a shorted crossover on one of your speakers. 2nd test is to plug in One speaker, and test it at high volume, it will not harm it. If it shuts off disconnect that speaker and try another. Only one at a time. If it works at high volume, you need to isolate one of your speakers and i bet it has a shorted crossover that has been cooked. P.S. If one is bad, suspect they will fail at a later date. If they all fail, use a friends speaker and try it before sending it to a repair shop.
P.S. i found one on ebay i think you can get for under $100 bucks in the box.
Seems like you have a shorted output channel, remove all your speaker connections and try again, if the problem persist, good chances are that you need to replace a couple of power transistors, let me know if you need more help, I've fixed some Yamaha amplifiers with this problem
This maybe an easy one. Have you unhooked all the wires going in to the stereo. "SP wires" means you have wires to the speakers are touching and the stereo is shutting down to avoid overloading. Hope this helps...