sherwood Newcastle R-672 A/V Receiver Shuts down

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Virden1
    New Member
    • Nov 2012
    • 4
    • USA
    #1

    sherwood Newcastle R-672 A/V Receiver Shuts down

    I have a R-672 that powers down to standby mode randomly. It was in a cabinet that held a lot of heat, and was wondering if it was triggering a heat sensor or something from getting too hot. I took it out of this cabinet and and let it sit to cool down for several hours. I unplugged everything but the power just to make sure there wasn't a short from a wire or something and still had the same issue. I then did a factory reset to the reveiver, powered it up, and still had the same issue. I took the cover off the unit and saw no visible problems to any capacitors or anything. Any ideas of what's going on?

    Thanks,

    Steve
    Tags: None
    • 999999999
      Badcaps Veteran
      • Sep 2006
      • 774
      • USA
      #2
      Re: sherwood Newcastle R-672 A/V Receiver Shuts down

      Probably a leaky transistor causing excessive current -> overheat condition. Look at the output stage, the main output transistor, then those that bias it and so on.

        Comment

        • Virden1
          New Member
          • Nov 2012
          • 4
          • USA
          #3
          Re: sherwood Newcastle R-672 A/V Receiver Shuts down

          Ok will do!

            Comment

            Previous template Next

            Related Topics

            Collapse
            • BigPete
              Intermittent display on Sherwood Newcastle R-965 Receiver
              by BigPete
              Hi all,

              I'm working on a Sherwood R-965 at the moment. It came in with relays clicking constantly and also going into protect mode.
              I've re-soldered a lot of dry joints and replaced quite a few capacitors and now it works, but I still have one problem I haven't solved and would like some opinions.
              The vacuum display is quite intermittent. Sometimes it won't turn on, sometimes it will turn on but the characters, numbers and letters are frozen on, regardless of which buttons are pushed. And sometimes it works flawlessly. If the display doesn't turn on initially, restarting...
              08-25-2024, 02:48 AM
            • huzo
              HP Omen shuts down when loading OS
              by huzo
              The model is 15ec-1061nm
              Board number is DAG3EDMB8D0​

              SO i turn the laptop on , and as soon as it starts booting from disk, from usb, windows,linux,HBCD,anything i boot it just turns off....while in bios menu or in linux boot menu it stays on normally...It's like when it starts to use graphics it shuts down...But i measured 0.72V while working on the GPU power line,no excess heat is comming from GPU or CPU, i even removed the heatsink and turned the laptop on and everything worked fine, got a bit hot, fan span to full speed, but it worked like that for few minutes in bios...
              10-29-2024, 12:05 AM
            • CdDvdFlash
              DSE GE6878 possible TV receiver dying remote not working well
              by CdDvdFlash
              For this Dick Smith TV GE6878 (Thompson) I replaced the broken remote with a universal it kinda works though if its more than a few meters away sometimes the buttons register and sometimes they wont so I bought another remote from another brand and it has the same problem, I've had an old TV in the past that the sensor died completely and I replaced it to fix it could this be a similar problem? I tried looking for a service manual, spare parts for a receiver and a parts list but I couldnt find any info. can someone please help me to find the info online for a service manual or where I can buy...
              07-03-2024, 03:55 AM
            • JordanW
              Diagnosing NAD receiver -- unexplained shut-downs
              by JordanW
              Everyone -- I am trying to troubleshoot my NAD C740 stereo receiver, which either won't power on or won't consistently stay powered on.

              I will start by saying that I am a hobbyist, and while I am decently handy with basic DC stuff, I am more hesitant when it comes to mains-powered equipment (that is, reluctant to poke around with a multimeter when it is powered on)

              The central issue is that after a long period of non-use, the receiver powers on and all functions seem to behave normally, but after a couple of minutes, it powers itself off.

              If I attempt...
              01-02-2023, 11:43 AM
            • JayPoorJay
              TV that only has headphone out to receiver/amp
              by JayPoorJay
              Hello All... Grateful for this site!

              I just repaired a 70inch Sharp flat screen I found on the curb in NYC (there are 1000s) thanks to the good folks on this site

              I have a question about an audio signal from a TV that only has a headphone jack as a audio output source. I have it hooked up now with a headphone style adapter that converts the headphone plug to an RCA. I plug this into my PHONO input on the receiver. To play it this way I need to turn volume waaaay down on TV and volume up higher than I think I should on the receiver. I get undertone hissy sound, blunt...
              02-20-2022, 09:03 AM
            • Loading...
            • No more items.
            Working...