No power RX-V681

[Aukreutzer]

I just inherited a Yamaha Rx-V681, recently the previous owners House was struck by lightning and blew all attached electronics. Assumed that only the 8A 125V fuse blew. Replaced Fuse but still no power. I am trying to see what I need to do to get this working? I have a multimeter, but no idea where to start or look into, or what to measure. There is no noise when pressing the main power button, no lights or ability to put into auto diagnostic mode. Any help would be greatly appreciated!

 

[WHONOES]

If your Yamaha has suffered a lightning strike, the best thing you could do with it is throw it away.

 

[Ylli]

If your Yamaha has suffered a lightning strike, the best thing you could do with it is throw it away.

My first thought is: No! it would make a nice platform to learn a thing or two. But since I can not find a service manual for it online, that may be the best advice.

 

[WHONOES]

I think so. It is likely that just about everything has been fried.

 

[Ylli]

Could be, or could be a Zener diode in the standby regulator is fried. But no way to tell without at least a schematic and a voltmeter.

 

[bushtech]

I found a service manual for my RXV479 so maybe do a bit of digging

 

[Martaine2005]

I wouldn’t be so quick to write it off.
At the very least, check the obvious internal fuse/s and inrush current devices and bridge rectifier etc.

When I lived in rural France, lightning was the number one electronics killer.
We went through 6 (equivalent) Sky boxes and 4 laptops thanks to lightning strikes.
The sky boxes were all MOV issues. The laptops were chargers only, diode and capacitor blown.

You may be lucky and find you are in a similar situation with your unit.
Open it up and check.

Martin

 

[shrtrnd]

I've spent a large part of my life repairing and returning units to life after other people threw them away.
I agree with Martaine2005, that since you appear to be willing, open it up and see what you can see.
You MAY find a device or two burned, that will point the way to where you should look first.

 

[PETERDECO]

It can go either way. Over the years when I was fixing stereo receivers that were hit by lightning, sometimes they were repairable without too much damage. Other times the whole thing was fried ; power supply, amplifier, tuner, etc.

 

[Aukreutzer]

I do want to check out the internals, I just do not know where to begin....I took the subwoofer and all it needed was the fuse replaced, like I said I completed this with the receiver. Anyone know what points I should check? I saw a few posts in regards to checking resistance of the transformer but unsure on how that is accomplished other than place my multimeter On ohms, any help on where to check or picture a schematic on where to poke around I can do all the digging.

 

[Aukreutzer]

I found this, does this help with someone getting me started on attempting to fix this?