A DC offset on any channel will cause this.
Also a repeated high volume overload causes a lock out. That requires a system reset.
Cannot remember the sequence. Another more savvy member will know.
My Yamaha RX-V590 Receiver has just developed a problem. When I turn it on it switches off after about 2 seconds. Looking on the internet it seems that this is a common problem with these amps but I cannot nail down the problem. With the speakers disconnected I have checked there is no short circuit causing it. I have even held up the mains relay but there is another relay on the main board that switches off as well. Anyone have any suggestions?
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A DC offset on any channel will cause this.
Also a repeated high volume overload causes a lock out. That requires a system reset.
Cannot remember the sequence. Another more savvy member will know.
Well the service manual is easy to get once you pass the annoying recaptcha:
I doubt there is a single known solution for this 'common' problem.
You got the schematics, so now you need to do the work and trace first all the power supply rails if any of the voltages are out of value or shorted.
There is a self check mode, you can see if stays on, I doubt it but worth a try.
Otherwise you will need to work passively and check for shorts on those rails including low voltage ones.
Usual stuff, filter caps, power transistors, bridge rectifiers which could also be (partly)open circuit.
Last edited by Uncle Fester; 20-04-21 at 10:26 PM.
Update: A deletion of features that work well and ain't broke but are deemed outdated in order to add things that are up to date and broken.
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Thanks guys. I think it must be a leaky cap because if I leave it off for a while it takes longer for the thing to shut down. I might just have to junk it. It's a pity really because it is a good quality amp.
hinekadon (22-04-21)
If it's a "really good quality amp" why don't you attempt to fix it?
If you lack the expertise, get it repaired by someone who knows what they are doing.
Just because we live in a so-called "throwaway society", does not mean that you have to be part of it!!!
Why not "donate" the unit to someone who will value it and not consign it to landfill?
Think outside the square.
Give it to a local radio/electronics club.
Advertise it on Gumtree or similar.
Don't take the "easy way out".
gungadin (21-04-21),hinekadon (22-04-21),mtv (21-04-21),Uncle Fester (21-04-21)
There is a common fault where the receiver will switch off a couple of seconds after applying power. A cap in the power supply is usually the fault. Here is video of a similar fault in a yammy rx-v557.
Yours may not be exactly the same, but the fault is common to a lot of models.
Thanks all for your help on this. I have isolated the area where the fault is. When the speaker relay clicks in the +5V rail goes to +7.68V which then trips the mains relay out. I have been round and round that part of the circuit but can't track down the problem so I have taken tristan's idea on board and put it on gumtree.
Here is the link:
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