Rx-v795a reciever shuts off after 5 min or more can not hear fan in reciever for cooling.

Shutting down on safety. It's likely a pressure switch, possibly low pressure if fan is running.

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Do you hear a click sound as the compressor shuts down? If so that is the clixon (heat sensitive circuit breaker) that is opening and shutting down the compressor when it overheats. You have not had the AC filled with refrigerant so overfilling the unit cannot be an issue.
And if it is not overfilled overheating is caused by excessive current going into the motor which could indicate a problem with the motor windings..

OR, If the thermostat is faulty it could be prematurely shutting down the compressor. If you jump (bypass) the therm and unit does not shut off then you have found the culprit.

Can you hear the "whirl" of the fan? It is possible the fan is not turning & cooling the oven therefore it will shut down when it reaches a certain temperature. This could be caused by a supply fault to the fan or the fan motor, either way it would need to be tested by a qulified engineer.

There is a Microprocessor(computer) that controls the display. This Micro can be bad, the display can be bad, the connections between the two, as well. For more information, please visit my website at audioserviceclinic.com. Thank you.

For my YAMAHA RX-V795a, Replaced the relay DG1U, which is controlled by the on/off button. Because the switching contacts in the relay were burned in. (Relay of which you hear the click when you switch on or off)
And everything works again. But replacing it is a bit of work...

You have to, after opening the case, among other things, loosen the screws of the main transformer and some more things, to be able to turn over the PCB on which the relay sits, to loosen the 4 solder points of the relay.
The relay is Type DG1U, 12VDC coil , switching contacts 8A 250V AC and is a Chinese brand DEC.
They are sold by Aliexpress, among others.

See if you can reposition the thermister on the facing of the evaporator coils. That could be it or the thermister might be bad. They don't use copper/mercury sensing bulbs these days. They use these cheap thermisters.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

You may have a cooling problem (with older computers), if you hear your fan running excessively and then it shuts down on you. Otherwise it is more likely a hard drive issue.

Check the speakers maybe one is already about to burn

Its necessary to run cooling fan because Amplifiers in home theater system produce heat during its operation. If you shut down cooling fan, Amplifier ICs may be damaged due to over heat.

There is a relay right next to the fuses on the inside dg1u it says on the top. I cleaned it and pressed down firmly on it and it seem to have fixed it. It fired up for the first time.. The relay might need to be replaced if this doesnt work for ya.
I found a solution at: http://www.diyforums.net/forums/domestic-electronics/11098-yamaha-rxv795-receiver-shuts-itself-down-after-some-time.html