Yamaha rx-v373 power supply problem

[thomas.p]

I have a Yamaha rx-v373 receiver that does not power up. I checked for 120v ac coming in, and there is 120v AC going to power supply. The fuse is OK also. I don't have 120v ac coming off the connectors on the power supply that go to the big transformer. I get no voltage at all across the pins that are on the power supply, that connect to the transformer. I also tried to power the receiver up by pressing the on/off, straight, and tone control buttons at the same time. When I press these 3 buttons I can hear a relay click, but the receiver still doesn't come on. I am wondering if the problem is related to the power supply, or possible the main bd. if I wanted to try and replace the power supply, would anyone have a idea of what a power supply would cost for this receiver, and where I could purchase one ? Or, if I have to replace the power supply, do you think it's more practical to just buy another receiver ? Any input on this issue would be appreciated, thanks.

[CapLeaker]

Re: Yamaha rx-v373 power supply problem

Maybe this is a help for you?
https://www.badcaps.net/forum/showthread.php?t=32444

[selldoor]

Re: Yamaha rx-v373 power supply problem

Perhaps this as well - someone does mention the thermal fuse in that thread but dont think it was followed up,

https://www.youtube.com/watch?v=1xIlqe-P1CM

At least it seems easy to test.

[thomas.p]

Re: Yamaha rx-v373 power supply problem

Thanks for the advice, will work on receiver as I have time. Would you be able to tell me how to check the thermal fuse the correct way with a mutimeter ?

[thomas.p]

Re: Yamaha rx-v373 power supply problem

I can't view the you tube ( Yamaha rxv power problem repair ) on you tube. It is blocked and I can't view it. Would you be able to tell me where the thermal fuse is located on the transformer ?

[3d0]

Re: Yamaha rx-v373 power supply problem

This is from the youtube video:

Set your DMM to ohms, and check the grey and blue wire, if there is no reading the primary coil could be damaged.

Most likely it's the thermal fuse not the coil, although it is hidden in the transformer. You can bypass the blown thermal fuse, but you need to cut the wires as shown in image 2. You cut the blue wire just before it enters the transformer (circled in yellow).

Solder a new thermal fuse, in the video he bends the thermal fuse and inserts it into the transformer shown in image 4.
After you soldered the fuse, check the blue and grey wire with your dmm, it should show 6 Ohms.

[Tjfix767]

Re: Yamaha rx-v373 power supply problem

What's the fuse rating and or p/n?

Are you able to remove the old one or is it perminately installed?