Question about Yamaha RX-797 Receiver

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Yamaha RX-730 Display Does not Light Up

I have the very same issue. I am the original owner of a RX-730 receiver with a non-functioning display. I am not sure when it went out, but the unit has been sitting on a shelf in my basement for at least 16 years. Ipulled it out, and can't believe how much better the tuner works than a couple of Sony's that I have had in the interim. Therefore I am motivated to get it fully functional again because it's kind of hard to tune without a display!

It doesn't look like a cheap fix though. It will probably need both a display controller board and the display itself. I think that the display is ok, but it has about 50-60 solder joints to the board that would have to be undone. It seems like it will be easier to just solder up a couple of new parts which will cost $$$.

I'm searching for a service manual right now and I'll update the post when I get it figured out.

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The display is backlit with an incandescent bulb an easy fix. Two wires from power supply to a white plastic hollow reflector assy, similar to the back of an auto headlight assy. unplug at pwer supply and remove bulb from reflector insert new bulb and your done. Be careful not to damage pc board above reflector it's the controller for the LCD dislplay.

Posted on Nov 18, 2009

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Cd snit is right, it's really easy to do just plugs in like a car headlight. i have the same problem with mine. backlight bulb burns out. (no setting to turn display off on this old unit). i replaced the backlight once with a small light bulb from radio shack but it quickly burned out the new one too. i'm pretty sure the the circuit feeding the bulb is hinky & it surges on power up & blows the bulbs. we've just gotton along without the display as we only use the old thing for occasional listening.

Posted on Dec 19, 2009

  • marty k Jun 13, 2012

    ok so after the wife was complaining about not being able to see the display i took some time to figure out what kind of bulb would work in this thing. found out that a 12v automotive bulb does the trick. measured voltage was just under 9v (after i toasted the resistor in that circuit by trying to measure the current the wrong way). anyway, i connected a type 37 bulb (12v dash light) and it seems to be working ok now for the last 2 weeks. i was worried about the heat generated by the bulb so drilled a couple holes in the white plastic shroud for ventilation.

  • ximuhonorsoc
    ximuhonorsoc Jun 14, 2012

    After I got hold of a service manual, I was able to determine the specification on the bulb and find a suitable substitute that plugs right into the backlight reflector. My replacement bulb has been going strong for almost three years now without any issues. I've got a few extras, so anybody stumbling across this post can contact me at mfw @ mechanova (dot) com and we can work something out. Put a period in the email address where the word dot is spelled out

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  • Yamaha Master
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Have you checked the settings on the receiver? You can turn the display "off" on many Yamaha receivers. If you don't have the manual, post a comment and I will PDF one to you. Hope this helps

Posted on Jul 26, 2009

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Hi and welcome to FixYa,

Have seen a lot of similar issues here at the site and on the field.

I have posted in your original problem, excerpt below:
Initially, a workaround:
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Even if it were a compatibility issue or HDMI processor issue on the receiver, the above should get you going.

Then the non functional HDMI could be attended to at your convenience. Technically, it would appear to the the HDMI signal processor of the receiver.

Good luck and Thank you for using FixYa. Happy Holidays.

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