Receiver stays on 3-5 seconds then turns off

SOURCE: yamaha receiver RXV-1400 turning off after 3 seconds.

Hi
there are several reasons, but the most common is because a high power trasistor is shorted, most yamaha receivers use the same names for the failure signals, such as PRD, PRI, PRY
The PRI is the signal that "tells" to the microprocessor that something is wrong with the power amplifier stage. so my recommendation is that look with the ohmeter a power transistor shorted usually if one if damaged, the next one or complimentary is too, there is a small transistor between the two big ones, usually is the number is D1915, if this is damaged, USE the SAME, also look for resistors damaged, specially the low value like the big white this resistor is 2 in 1 and some times just one resistor opens.

I hope this helps

Miguel

SOURCE: When i turn on my receiver, it starts up for a

first of all , check all your speaker wiring make sure none are touching acrros(frayed) . if good disconnect 1 speaker at a time and turn on unit . if it stys on you found your problem- a shorted speaker.
If none of these things work, disconnected all speaker aand check with a volt ohm meter( you can get a cheapie at Radio Shack)- acroos each speaker you should have either 4ohms, 6 ohms or 8 ohms, depending on the rating on the back of the speaker. if any read lower, replace speaker.

If all else fails, go to yamaha.com/usa and go to support, call service center for repair listed on site.
hope this helps ! Steve A.

SOURCE: when I turn on my

Generally speaking, an amp protects itself from heat, shorts and overloads.

Overloads can be from excessive periods of high output 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 hands-on tech.