Yamaha RX-V361 receiver damaged after overheating

Discussion in 'General Electronics Chat' started by Managre, Mar 11, 2014.

  1. Managre

    Thread Starter New Member

    Mar 11, 2014
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    Protection circuit activates after few seconds. Relay clicks. Display does not work. What elements are likely to be damaged due to overheating? What should I test?

    Image gallery:

    http://imgur.com/a/BDQNI
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    sounds like its the speaker protection relays, or de-thump circuit, i would say its the two ic modules that are blown (long black chips bolted to heatsinks) with white compound on
     
  3. Managre

    Thread Starter New Member

    Mar 11, 2014
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    Ah, I hope ICs are alright as 2 of those cost more than used receiver.
    Is there a way to test them?
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    only by swapping them for new ones..

    you can download.. manual here
     
    Last edited: Mar 11, 2014
  5. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Disconnect the speaker cables at the receiver and try again. Make sure you don't have a short in your cable or speaker.

    Also, there is a self-diagnosis procedure in the manual that DodgyDave posted (see his link) - it should be able to tell you why the protection mode activated.
     
    Last edited: Mar 11, 2014
  6. Managre

    Thread Starter New Member

    Mar 11, 2014
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    Everything is disconnected from the receiver. I can't use the self-diagnosis as display doesn't turn on.
     
  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Yes, you can assume that is the case, or you can actually READ THE MANUAL!!! It tells you how to override the protection mode so you can keep the unit on and display the protection errors.
     
  8. Managre

    Thread Starter New Member

    Mar 11, 2014
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    It doesn't work, there is no way to turn on the display.
     
  9. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    See page22 to start in "cancel mode"

    =============

    Starting DIAG in the protection cancel mode
    If the protection function works and causes hindrance to trouble diagnosis, cancel the protection function as described below, and it will be possible to enter the DIAG mode. (The protection functions other than the excess current detect function will be disabled.)
    Press the “STANDBY/ON” key while simultaneously pressing those two keys indicated in the figure above. At this time, keep pressing those two keys for 3 sec- onds or longer.
    In this mode, the [SLEEP] segment of the FL display of the main unit flashes to indicate that the mode is DIAG mode with the protection functions disabled.

    ==============

    If this doesn't work, then you have an over current issue.
     
    Last edited: Mar 11, 2014
  10. Managre

    Thread Starter New Member

    Mar 11, 2014
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    I tried it and it doesn't work. I am sure it's an over current issue as display doesn't even turn on, it doesn't even flash for a second or something.
     
  11. dmshropshire

    Member

    Dec 1, 2013
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    This looks dangerously close to the same thing, id give it a quick look. It sounds like a common problem with Yamaha receivers. Not saying this is it but its worth a quick view.
    http://www.youtube.com/watch?v=MwvjAtSr5t8
    There is a part 1 as well.
     
  12. Managre

    Thread Starter New Member

    Mar 11, 2014
    8
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    Following your suggestion I checked some elements in the opening circuit. I found a problem:

    [​IMG]

    Could this diode be a cause? Luckily I ordered a whole diode kit few months ago. Tomorrow I will solder find a replacement and solder it.
     
  13. Managre

    Thread Starter New Member

    Mar 11, 2014
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    Replaced diode with 1N4148, still not fixed.
     
  14. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    Protection circuits are usually triggered by some kind of overload on the power supply. Really could be just about anything, but old electrolytics are always the first suspects.
     
  15. bwilliams60

    Active Member

    Nov 18, 2012
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    Do you have the entire schematic for this unit? If so, could you possibly send it to me?
     
  16. Managre

    Thread Starter New Member

    Mar 11, 2014
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    fisher70 likes this.
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