Yamaha RX-V650 won't power on

thiPo · Guest

When i came back from a holliday, my receiver won't power up anymore.
Only after unplugging and replugging the mains plug, i am able to turn it on.

At first I only needed to unplug once, but now i sometimes have to try ten times or more. I noticed as well that it gets worse when the receiver is allready warm.

I can't hear the mains relay click when i press the on button.
When it does click, the receiver works without a problem, although, sometimes it just powers down by itself.

The receiver in won't come in "Failsafe" (DIAG) mode either.

Has anyone allready fixed a receiver with these problems, or can anyone hazard a guess as to what's going on?

Thanks in advance,
Pol

jts1957 · Joined: 24 Nov 2008 Posts: 2476 Location: Far, Far Away

Puffed electrolytics in a power supply?

thiPo · Guest

Drdave · Joined: 11 Jun 2009 Posts: 24 Location: South Florida

Check the mains relay and make sure it is passing a AC to the power transformer.We have had a few cases of intermittent mains relays.
Let us know.

thiPo · Guest

I couldn't find any puffed capacitors or burned/marked spots on the power PCB. There isn't any notice in the diag mode either.

The main relay seems fine: when presseng the power/standby button, one side gets drawn to ground, and the relay clicks. So the relay seems fine. When the receiver won't come on, one leg of the relay isn't drawn to the ground.
I checked the diode, below the relay, and they had their required values.

The powerbutten (pushbutton) seems to be working as normal as well.

Drdave have you found cases where the relay only failed when the receiver was plugged in, for some time?

Could the problem be a capacitor with an excessive leaking current? So over time the capacitor gets charged, and when "full" the relay haven't got enough power? to stay on?[/b]

jts1957 · Joined: 24 Nov 2008 Posts: 2476 Location: Far, Far Away

Try electrolytic in power source that feeds the coil of that relay (usually in 47ufd to 330ufd value range). Wink

Guest · Posted: Sun Sep 06, 2009 4:28 pm Post subject:

Justmanuals · Joined: 21 Aug 2004 Posts: 1948

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thiPo · Guest

I allready have a service manual,
but thanks anyway Smile

Btw, the guest post was mine as well.

hdtkid · Guest

i have the same yamaha reciever and same isue. well to start anyhow.

mine started with me needing to unplug and reconect the power cord for the unit to make it power up.

tho more recently its become alot worse. now after its been on for a wile (times from say 1hour and over) it can begin to turn it self off and then straight back on again.

other times its will turn off stay off for maybe 20-30min then turn it self back on.

last night it turned off again, after doing some searching online i disconected the power supply and cleaned the terminals ect... reseated what conections i could reach and stragely after being with out power for 40-50min as soon as i reconected everything and pluged in the power it turned it self on. so the relay or a microchip (something in the unit) still knew it was ment to be switched on.

i have tryed the unit with a fan in front, on a cold night and still turns off, also tryed with a heater in the room on a hot day and it didnt make it turn off for 4 hours (i started to feal sick b4 the unit turned off)

im out of idears. i hope this extra info can be of use to ThiPo and DrDave to assist us.

with my google search it seams there are many RX-v650s with the same problem