Results 1 to 3 of 3

Thread: Danger - faulty switchmode power supplies

  1. #1
    Senior Member
    Join Date
    Aug 2007
    Posts
    387
    Thanks
    20
    Thanked
    30 times in 21 posts

    Danger - faulty switchmode power supplies

    I recently bought a cheap USB hub from Ebay - Chinese made, ridiculously cheap, and came with a small switch-mode PSU not much bigger than a 13A mains plug. After a couple of weeks use, the PSU emitted a loud bang, and showered bits of hot metal and burning plastic across the room. Closer inspection revealed no CE marking; taking it apart, half of one resistor had vapourised and there was clear signs of overheating on other components, with some local melting of the case.

    The label identifies it as 'AC Adaptor Model KS868 Input AC 110 - 140V 50/60Hz Output DC5V +-0.2v DC500mA+-30mA' - output connector is a wired-in circular DC connector plug, not a USB cable.

    Pictures at https://picasaweb.google.com/1158460...eat=directlink

    If you have one of these, obviously please don't use it!

    Please repost this on any appropriate forum and to your Facebook contacts - might stop somebody's house burning down, may even save a life.

  2. #2
    Senior Member
    Join Date
    Feb 2008
    Posts
    887
    Thanks
    4
    Thanked
    144 times in 133 posts
    • smargh's system
      • Motherboard:
      • Gigabyte GA-EP45-UD3P
      • CPU:
      • Xeon E5450 with 775-to-771 Mod
      • Memory:
      • 16GB Crucial
      • Storage:
      • Intel X25-M G2 80GB/Adaptec 3405 4x 2TB Ultrastar RAID1 / 1x 6TB Hitachi He6 / Dying 2TB Samsung
      • Graphics card(s):
      • GTX 750 Ti
      • PSU:
      • Seasonic X-560
      • Case:
      • Lian-Li PC-A71
      • Operating System:
      • Windows 7 Ultimate 64bit
      • Monitor(s):
      • BenQ G2400WD
      • Internet:
      • Really Crap ADSL2 <3Mbit

    Re: Danger - faulty switchmode power supplies

    I had a similar problem with the PSU of a USB hub a few years ago, but that just stopped working - no molten lead shower. When disassembled, some bits were obviously burned.

    This is a feature of electrical products in a cut-throat economy. I once tried looking for a visibily high quality USB hub, but couldn't find one.

    I sometimes pay silly amounts for quality PSUs. Those for my ADSL router and bedside alarm clock cost £34 and £23 from Farnell. I have another 12v Mascot branded PSU for a WRT54G, a 9v for a fibre-copper media converter and an 18v for a firewall, all costing similar amounts. I just don't trust cheap power supplies.

  3. #3
    Admin team peterb's Avatar
    Join Date
    Aug 2005
    Location
    Southampton
    Posts
    19,381
    Thanks
    2,892
    Thanked
    3,403 times in 2,693 posts
    • peterb's system
      • Motherboard:
      • Nascom 2
      • CPU:
      • Z80B
      • Memory:
      • 48K 8 bit memory on separate card
      • Storage:
      • Audio cassette tape - home built 5.25" floppy drive
      • Graphics card(s):
      • text output (composite video)
      • PSU:
      • Home built
      • Case:
      • Home built
      • Operating System:
      • Nas-sys
      • Monitor(s):
      • 12" monocrome composite video input
      • Internet:
      • No networking capability on this machine

    Re: Danger - faulty switchmode power supplies

    Quote Originally Posted by greenalien View Post
    <---snip

    If you have one of these, obviously please don't use it!

    Please repost this on any appropriate forum and to your Facebook contacts - might stop somebody's house burning down, may even save a life.
    Better still, report it to trading standards, weho may be able to track down the importer, stop any further imports, and get the product recalled.

    Also worth reporting it to Ebay.
    (\__/)
    (='.'=)
    (")_(")

    Been helped or just 'Like' a post? Use the Thanks button!
    My broadband speed - 750 Meganibbles/minute

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 23
    Last Post: 18-06-2007, 08:31 AM
  2. how to choose a PSU?
    By loriel60 in forum PC Hardware and Components
    Replies: 8
    Last Post: 14-01-2004, 04:40 PM
  3. Need Help P4vmm2 Mainboard Burns Power Supplies
    By Megadeth in forum PC Hardware and Components
    Replies: 3
    Last Post: 16-10-2003, 08:26 PM
  4. power supplies
    By petrefax in forum PC Hardware and Components
    Replies: 24
    Last Post: 31-07-2003, 02:12 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •