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Netgear CG814WG v2 cable modem blinking lights.

Discussion in 'Electronic Repair' started by David Farber, Jan 13, 2013.

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  1. David Farber

    David Farber Guest

    I have a Netgear CG814WG v2 cable modem. The internet went out this morning
    and I checked the lights on the modem. The power light comes on, then the
    connected ports light up, then all the lights on the modem go on, then they
    all go off. This cycle repeats continuously. I held down the reset button
    for 10 seconds but that didn't clear up the problem. I thought it was weird
    that even though I was holding down the reset button, the lights continued
    to cycle on and off just like before.

    In my efforts to narrow down the problem, I have the following question.
    Shouldn't the lights remain steady even if there is nothing hooked up to the
    ethernet ports on the modem? I called the cable company and the tech agreed
    with me and said he never heard of that happening before (all the lights
    cycling through an on/off pattern). I left it powered off for a few hours
    and powered it back on, same thing.

    Thanks for your reply.
  2. I'm reminded of the old riddle "What time is it when a clock strikes 13?" --
    "Time to get a new clock."

    In general, none of the router output lights should be illuminated unless the
    output is actually connected to computer. The symptoms you describe suggest a
    bad router.
  3. hr(bob)

    hr(bob) Guest

    You power cycled it, that's about the most you can so, take it back to
    your cable company and get a replacement. If necessary, demonstrate
    to them that it's dead at their office. Mention that you have been
    without service for X days and want a refund on the internet portion
    of your cable bill.
  4. David Farber

    David Farber Guest

    Hi Jeff and everyone else who posted before,

    The first thing I tested was the power supply. It read a steady 5 volts dc.
    I tried every type of reset. It didn't help. It is now more than 12 hours
    since the problem happened. Then it dawned on me, what does the output
    sticker on the power supply say? Really? *12* volts dc? I couldn't find
    another 12V 1A wall adapter in my box of power adapters. But I do have a 12V
    portable jump start car battery with a built in air compressor AND a dc
    output jack. I rummaged through my stuff again and found a car cigarette
    lighter (do we still call them cigarette lighters?) attachment with a
    standard small plug on the other end. I hooked it all up and now it's
    working again. My next question is until I find a suitable AC adapter
    replacement, can I just keep this 3-in-1 jump starter plugged into the AC
    all the time to keep it charged? This is what it looks like though I got it
    from Costco many years ago

    Thanks for your reply.
  5. hr(bob)

    hr(bob) Guest

    If you have two 5V adapters, you might be able to put the two outputs
    in series to get 10V. That might be enuf to power the electronics,
    they are somewhat tolerant of lower input voltages. Can't hurt to try
    since you already know 5V didn't harm anything.
  6. David Farber

    David Farber Guest

    Interesting suggestion. I think I will try popping the case open on the
    original one and see if there are some dried out caps. Any suggestions on
    how to get a screwdriver into the seam of the case and prying it open
    without destroying the whole thing? On the other hand, I just found this on

    Thanks for your reply.
  7. David Farber

    David Farber Guest

    Hi Jeff,

    Wow. I must have that 5 volt number stuck in my head. Thanks for pointing
    that out. Must be the stress from not having internet for more than half a

    You can dock me points for not using a scope and then more points, make that
    dollars, when I almost ordered the wrong power supply. Why would I need to
    test it with a load when it's already less than half the voltage it's
    supposed to be? This was one of those situations where I did a quick memory
    scan of everything I had ever fixed. Replacing a power adapter that had a
    low output (not including ones that were totally dead) wasn't on the list.
    Anyway, I found an online video on how to crack these things open. A small
    butter knife and a rubber mallet to strike the knife along the seam of the
    case popped it right open. It took only a few minutes to find the bad cap.
    470uf @ 25 volts. I had a 35 volt one in my box and it just barely fit into
    the case. I powered it up and it works fine now.

    Thanks for your reply.
  8. David Farber

    David Farber Guest

    3 months of bad caps or one, ok maybe two, old Mitsubishi TV's. (-;

    The ESR meter is what I used to find the culprit. The other caps seemed to
    be in the normal range.

    Thanks for your reply.
  9. hr(bob)

    hr(bob) Guest

    This whole interchnge of e-mails just shows how importannt little
    things turn out to be<g>.
  10. David Farber

    David Farber Guest


    Thanks for your reply.
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