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Yamaha home theatre receiver - won't power up

Discussion in 'Electronic Repair' started by Matthew Kirkcaldie, Feb 24, 2007.

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  1. Hi all,

    Just on the chance that someone has seen this kind of thing before - a
    friend's Yamaha RX-V520 5.1 receiver won't power up by the switch on the
    front or the remote.

    A quick look inside shows everything looking OK - fuses are also fine.

    Lacking a service manual I'm not sure where to go from there. Has
    anyone seen this problem before?

    Thanks for any help,

  2. Arfa Daily

    Arfa Daily Guest

    Any activity at all ? Standby LED ? Powers for a moment and then shuts down
    immediately ? Yammy AV amps are very complex, and not for the faint hearted,
    but if it is *totally* dead rather than not coming or staying out of
    standby, you might stand a better chance with it.

  3. jango2

    jango2 Guest

    Does the unit have a small standy power transformer?. If so, isolate
    and check for an open primary.
  4. Totally dead, no LED, no nothing. As Jango suggested I'll look for a
    small standby transformer - I was thinking it must be something like
    that to power the logic for the controls on the front while it's off.

    Thanks Arfa, give my regards to Terry - I might come and see you about a
    tasty motor sometime.


  5. Arfa Daily

    Arfa Daily Guest

    You're welcome, and your kind regards have been passed to Terry ...( ! )
    Jango's suggestion is a good one, and exactly what I would have said. He too
    is an experienced engineer. If the worst comes to the worst, I have access
    to Yammy service info. Mail me off-group if you get to the point of needing
    it, and I'll see what I can do for you.

  6. jango2

    jango2 Guest

    Thanks for the endorsement Arfa :), what are you busy with these
    Well, Matthew, how's the progress on the RX-V520 going?. I try my best
    to post final results on a successfully completed job here so people
    may refer to it later.
  7. Arfa Daily

    Arfa Daily Guest

    Hi Jango

    Same old same old. Still pitting my wits against recalcitrant hifi's, DVDs,
    DVDRs, PVRs, group amps and the plethora of other nonsense and rubbish that
    the poor old public have inflicted on them as the latest "must have". Guess
    you're probably about the same. We are also working on an updated version of
    the three-changer video, and perhaps a couple of others like the Pan
    5-changer. Watch this space, as they say ...

  8. Bit hectic here, probably have to wait until next weekend! But I will
    definitely post my outcome.

    Cheers, MK.
  9. In one of the more awesome pieces of long-distance diagnosis I have
    known, it turns out the small standby power transformer has an open

    Now - my problem is to find out what to replace it with. It runs on
    240VAC (Australian mains) and the markings on the side are

    XW608 AO
    TAM M 0118

    It's only got one primary and one secondary as far as I can see.

    I have a schematic for the RX-V420, which is a slightly less powerful
    version with the same features (this one is RX-V520), and the
    transformer is on the schematic. It's component T161, listed as an
    "XW608" for the Australian model in the parts list on the right. Seems
    like the same components are used in this part of both models.

    The schematic shows "AC 12.8" as the voltage measurement across the

    I am a bit naive in these things but I am assuming

    (a) that 12.8 is VRMS, and
    (b) that a 240V AC transformer with a 12.8V RMS output, of similar
    physical size, would be a good replacement (I can't see a power rating
    and I assume it would be small given that it probably only runs the
    standby switch, IR receiver and a relay).

    How critical is the voltage likely to be? It looks like there is some
    kind of regulatory circuitry downstream. I can supply that part of the
    schematic if it would help.

    Thank you SO MUCH for your incredible suggestion.


  10. Ah well, didn't work. It was a classic case of finding what I set out
    to look for - I had been using the continuity beeper on my multimeter to
    see if the primary and secondary were open or not - turns out the
    primary WAS OK but its resistance was slightly higher than my meter will
    beep for. So that wasn't the fault after all. I've given up and will
    pass it back to my mate in the hope he can take it to someone who
    actually knows what he/she is doing.

    Thanks to everyone who helped.


  11. larry


    Jul 2, 2009
    Yamaha RX-V650 receiver won't power on

    I have a similar problem with my RX and trolling the internet reveals it is not uncommon.Is there a fix yet?
    regards Larry
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