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  1. #31
    Senior Member
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    Sep 2007
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    Aberdeen, UK
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    My Radio was running continuously on external power but one day it died. I checked the power supply on another Radio and it was fine. I suspected that it may be the internal connection to the power input so I inserted a battery, and whoof my Q3 went up in smoke. So I’ve replaced that but it hasn’t got the Radio working again, and I’m wondering what the best sequence of replacement of items should be assuming (per the SB3 C16 and C20 capacitors) that there is a most likely failure mode. Any advice? I can solder capacitors, but that U2 power amplifier looks beyond my capabilities.

  2. #32
    Senior Member JoeMuc2009's Avatar
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    Jan 2009
    Location
    Muenster, Germany
    Posts
    216
    Hi all,

    got another failed Radio here, burnt Q3 and short circuit across the power amplifier outputs. However, it turned out that the short circuit continues to exist even after the power amp chip was desoldered.
    The owner told me he was not aware of any battery in the device but the battery (original model) was actually in there. Seems that the battery being in there can trigger the self-destruction out nowhere anytime.
    So I would recommend everyone to remove the battery for good and forget about it. Many devices seem to fail the moment the battery is inserted, but it might also happen in a power outage when the circuitry switches from external power supply to battery or back after external power is restored. Every one of these transitions is apparently very dangerous for the entire device.
    Things around the battery look like an afterthought. Logitech seems to have implemented this part of the circuitry in a hurry. I can just say, do not use it.

    Regards,
    Joe


    PN me if your Boom / Classic / Transporter display has issues!

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  3. #33
    Senior Member SlimChances's Avatar
    Join Date
    Apr 2005
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    1,873
    Quote Originally Posted by JoeMuc2009 View Post
    Hi all,

    got another failed Radio here, burnt Q3 and short circuit across the power amplifier outputs. However, it turned out that the short circuit continues to exist even after the power amp chip was desoldered.
    The owner told me he was not aware of any battery in the device but the battery (original model) was actually in there. Seems that the battery being in there can trigger the self-destruction out nowhere anytime.
    So I would recommend everyone to remove the battery for good and forget about it. Many devices seem to fail the moment the battery is inserted, but it might also happen in a power outage when the circuitry switches from external power supply to battery or back after external power is restored. Every one of these transitions is apparently very dangerous for the entire device.
    Things around the battery look like an afterthought. Logitech seems to have implemented this part of the circuitry in a hurry. I can just say, do not use it.

    Regards,
    Joe
    I have not read the whole thread but your post caught my eye. Will using a battery in the SB Radio pose a fire hazard or is will it just possibly damage the radio? I have used mine on battery and on mains with the battery always inserted for a few years now with no issues. Is this just asking for trouble?
    Version: 8.3.0 - 1655802730 @ Tue 21 Jun 2022 11:24:25 AM CEST
    • Operating system: Debian - EN - utf8
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    One SB Touch connected by Ethernet - Denon AVR -1912 Receiver, Paradigm 4.1 speakers
    One wireless SB Touch connected by Optical to Sabaj A4
    amp and Energy bookshelf speakers
    Two SB Radios wireless

  4. #34
    Senior Member
    Join Date
    Jan 2010
    Location
    Hertfordshire
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    9,452
    Quote Originally Posted by JoeMuc2009 View Post
    Hi all,

    got another failed Radio here, burnt Q3 and short circuit across the power amplifier outputs. However, it turned out that the short circuit continues to exist even after the power amp chip was desoldered.
    The owner told me he was not aware of any battery in the device but the battery (original model) was actually in there. Seems that the battery being in there can trigger the self-destruction out nowhere anytime.
    So I would recommend everyone to remove the battery for good and forget about it. Many devices seem to fail the moment the battery is inserted, but it might also happen in a power outage when the circuitry switches from external power supply to battery or back after external power is restored. Every one of these transitions is apparently very dangerous for the entire device.
    Things around the battery look like an afterthought. Logitech seems to have implemented this part of the circuitry in a hurry. I can just say, do not use it.

    Regards,
    Joe
    They can can fail without battery so this seems a bit over the top.
    https://forums.slimdevices.com/showthread.php?p=861151

    https://forums.slimdevices.com/showthread.php?p=909389
    Sent from my SM-G900F using Tapatalk

  5. #35
    Senior Member JoeMuc2009's Avatar
    Join Date
    Jan 2009
    Location
    Muenster, Germany
    Posts
    216
    There's no way of knowing what is going to happen. It's true, the Radio can also fail without ever seeing a battery at all, but from what I read here, most of these incidents involve the battery so that's suspicious.


    PN me if your Boom / Classic / Transporter display has issues!

    Blog: https://www.blogger.com/blogger.g?ri...50753#allposts

  6. #36
    Junior Member
    Join Date
    Jun 2016
    Posts
    4

    Again Dead :(

    So after it was working for 2 1/2 years my SB Radio died again. It went dead after it was running for several hours, before it was only used for a few minutes a day. Actually I am waiting for a new TPA but already replaced a blown diode (D6) which was short. I´ll keep you updated...

    Bye habee

  7. #37
    Junior Member
    Join Date
    Jun 2016
    Posts
    4
    Two Resistors (R328 and R316) are also blown. I think these were 10K Resistors, because the other ones around are. But they are so tiny, its hard to solder....

  8. #38
    Junior Member
    Join Date
    Dec 2009
    Posts
    4

    Radio working again, back from the graveyard

    I posted in this thread in 2013 about my SB Radio dying. I just checked back in and thanks to subsequent forum posts, I was able to repair my radio last night and now have it restored and fully working. I replaced Q3 and found a bad capacitor by following the suggestion of ramping up supply current while feeling for hot components. If it helps anyone, the capacitor is C348. I replaced it with a 10nF cap. Now I have 2 working SB radios again. I will probably avoid using a battery pack on this newly repaired radio, since I suspect my homebrew battery might have been at least a partial cause of the original melt-down.

    A few days ago I finally got around to looking at options for hosting my digital music collection on an at-home server. I am using a Raspberry Pi. I checked out Volumio and Moode also, and decided that piCorePlayer + LMS was the best. I am playing from the Pi via an I2C DAC ($15 AliExpress) into my Logitech Z-5300 5.1 amp+speakers (bought in 2006), and now using my 2 SB radios as players too. I like how they work together, syncronizing audio, etc. I made a small ESP8266-based controller to remote control the Z-5300 via MQTT / Node-Red I already had running locally on a separate Raspberry Pi.

    Great fun to bring together parts old and new for minimal additional cost and have a nice sounding powerful system to play my music.

    -Ed

  9. #39
    Senior Member
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    Apr 2005
    Location
    UK/London
    Posts
    5,999
    Welcome back after 9 years
    Paul Webster
    Author of "Now Playing" plugins covering Radio France (FIP etc), PlanetRadio (Bauer - Kiss, Absolute, Scala, JazzFM etc), KCRW, ABC Australia and CBC/Radio-Canada
    and, via the extra "Radio Now Playing" plugin lots more - see https://forums.slimdevices.com/showt...Playing-plugin

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