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WRT54G v1 Smoke Test

Discussion in 'Cisco/Linksys Wireless Routers' started by steevo1, Apr 26, 2007.

  1. steevo1

    steevo1 LI Guru Member

    I found a WRT54G v1.1 (20 LEDs, mini PCI) at the swapmeet.

    It didn't come with a power adapter. I looked at the linksys page on it and it seemed to use a 12v center + adapter.

    I found a suitable adapter and plugged it in. Couple of lights blinked on the front, then there was a pop, then I could smell burning.

    Great, just great.

    A physical examination of the board does not show any visible damage.
    I read some references to a protection diode. I have been looking around the board for that. I found a couple of square surface mount diodes but they don't appear failed.

    Can anyone direct me? I tried the linksysinfo.org forum search but that is broken, none of the returned links are valid, so I can't search the forums here for this. Someone should fix that.
     
  2. crawdaddy

    crawdaddy Network Guru Member

    I want to say that the v1 models run off of 5vdc, not 12vdc. So, you probably blew the protection diode or some other part. I'd call it trash, especially if you can't find the failed part on the board.
     
  3. steevo1

    steevo1 LI Guru Member

    Not trash yet, and it is 12v

    Not according to the linksys docs on that unit. The spec sheet says 12v 500ma.

    As to trash, I am not done looking, I just wanted some others to weigh in with experience before I look further.
     
  4. mstombs

    mstombs Network Guru Member

  5. steevo1

    steevo1 LI Guru Member

    I read that stuff, it doesn't really give enough details.
    I would hope a 3.3v regulator would be able to take 12v for a little while. This was instantaneous. FWIW it's a very small surface mount regulator. I see two on the board, I think. Because of the smoke and smell I would think you would be able to see something, and I looked at them both carefully with a microscope today. I checked all the diodes in that circuitry, they are good.

    Here is the data sheet from linksys.
    ftp://ftp.linksys.com/datasheet/wrt54g_ds.pdf

    But it doesn't seem to give the power specs. The one I looked at there before did. Odd.
     
  6. Slimey

    Slimey Network Guru Member

    the V1 takes 5VDC power adapter
     
  7. mstombs

    mstombs Network Guru Member

    I have had to replace a small 3.3V 1A surface mount regulator in an ADSL2MUE (5V 1A external psu). Part No was LD1117AV33, datasheet says absolute maximum input voltage 10V. The chip design includes some thermal protection, the failed one just wouldn't pass more than 0.5A - I guess half had failed open circuit. No idea if similar part used in old WRT54G.
     

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