Help repairing a WRT54G, not firmware related. blown power

Discussion in 'Cisco/Linksys Wireless Routers' started by wolfsterz, May 2, 2006.

  1. wolfsterz

    wolfsterz Network Guru Member

    I have a WRT54G v2.2 that I KILLED , what happened was... I was going to set this particular one up, as a repeater, on top of a hill, running off a deep cycle battery and a solar panel. When i was testing powering it from the battery, I had the wires switched, positive/negative. I cut the wires off the adapter it came with, I've since tried it with a know good power adapter from another wrt54g and its totally dead, no lights at all. So I was wondering if anyone had any ideas on how to fix it? maybe resolder on a capacitor or two? or a fuse?

  2. FaQso

    FaQso Network Guru Member

    In any case, you must open it and check for blown/burned parts.
    You could have fried the power regulator. A little part with a "AC" (AnaChip) symbol written on it. In this case, good luck. I tried to change that part, but couldn't get one that is the same.
    If you've blown just a capacitor, you'll see. It will be splattered all over the top of the casing of the router.
  3. wolfsterz

    wolfsterz Network Guru Member

    did some more testing...

    There is no evidence of a blown capcitor or any burn marks at all on the board, I did some testing with a voltmeter and the first capcitor shows 15v, but the 2nd capacitor, only moves the volt meter slightly, they are the same capacitor (220uf 25v) could that 2nd capacitor be the problem?

  4. FaQso

    FaQso Network Guru Member

    The first one seems to be fine.
    If you tested right, than there's a problem with the second one.
    But, just for precaution, test the components in between (if there are any). Hope that it's really just the capacitor. :thumb:
    Try mesuring the power regulator too.
    Input power is the first pin from left (12v - 15v, depends on load), output power is the second pin from left (3.3v, constantly). But first you must repair the power circuit to there.
  5. u3gyxap

    u3gyxap Network Guru Member

    I killed mine as well. The very same case - powered it by reversed polarity. The voltade regulator blew up, even made a flash and a small "BAM" noise like a firecracker. It split on two parts. I tried to put a voltage regulator from another WRT54G, but it appeared that some other components after the voltage regulator have gone bad too. So now it is a blue-black brick.
    I hope you revive yours.
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