Problem with fluorescent lamp or ballast

Discussion in 'Home Repair' started by Yong Huang, Jul 20, 2008.

  1. Yong Huang

    Yong Huang Guest

    One pair of the fluorescent lamps in the kitchen stopped working. I
    replaced with the other pair in the same big box on the ceiling. They
    still didn't work. Then I bought a ballast from Home Depot, a magnetic
    type, and installed it. One of the two bulbs can flash with dim light.
    I did this before (in a different place). Replacing ballast and all
    was well. But this time I'm at a loss.

    Can somebody tell me how I check the ballast or circuit? I did all the
    following measurements. Both ballasts are like this:

    _________
    Blk | | Blu
    W | | Blu
    Y | | R
    Y |_________| R

    Old ballast:
    Blk to W: 12ohm; Y to Y: <2 ohm
    Blu to Blu or R to R: <2 ohm; no continuity between Blu and R
    Blk to Blu: 3ohm; W to Blu: 10ohm

    New ballast:
    Blk to W: 8ohm; Y to Y: no continuity
    Blu to Blu or R to R or : no continuity
    Blk to one Blu: 1.5ohm; Blk to the other Blu: no continuity
    W to the first Blu: 8ohm; W to the other Blu: no continuity

    After I turned power on, I checked the voltage on the wires when the
    new ballast is installed:
    Blk: 120v; Y and W: 0
    Blu: 120v; one R: 0; the other R: 140v

    Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
    120V. The other 3 are 0.

    I don't know what I should measure exactly. Thanks for help.

    Yong Huang
     
    Yong Huang, Jul 20, 2008
    #1
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  2. On Jul 20, 6:46 pm, Yong Huang <> wrote:
    > One pair of the fluorescent lamps in the kitchen stopped working. I
    > replaced with the other pair in the same big box on the ceiling. They
    > still didn't work. Then I bought a ballast from Home Depot, a magnetic
    > type, and installed it. One of the two bulbs can flash with dim light.
    > I did this before (in a different place). Replacing ballast and all
    > was well. But this time I'm at a loss.
    >
    > Can somebody tell me how I check the ballast or circuit? I did all the
    > following measurements. Both ballasts are like this:
    >
    > _________
    > Blk | | Blu
    > W | | Blu
    > Y | | R
    > Y |_________| R
    >
    > Old ballast:
    > Blk to W: 12ohm; Y to Y: <2 ohm
    > Blu to Blu or R to R: <2 ohm; no continuity between Blu and R
    > Blk to Blu: 3ohm; W to Blu: 10ohm
    >
    > New ballast:
    > Blk to W: 8ohm; Y to Y: no continuity
    > Blu to Blu or R to R or : no continuity
    > Blk to one Blu: 1.5ohm; Blk to the other Blu: no continuity
    > W to the first Blu: 8ohm; W to the other Blu: no continuity
    >
    > After I turned power on, I checked the voltage on the wires when the
    > new ballast is installed:
    > Blk: 120v; Y and W: 0
    > Blu: 120v; one R: 0; the other R: 140v
    >
    > Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
    > 120V. The other 3 are 0.
    >
    > I don't know what I should measure exactly. Thanks for help.
    >
    > Yong Huang


    Do the tubes light up when you brush a hand over them?
    Check your ground. Tubes must be within 1/2" of a
    grounded metal surface (the chassis) or they won't
    start.
     
    Father Haskell, Jul 21, 2008
    #2
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  3. Yong Huang

    Yong Huang Guest

    On Jul 20, 8:59 pm, Father Haskell <> wrote:
    > On Jul 20, 6:46 pm, Yong Huang <> wrote:
    >
    >
    >
    > > One pair of the fluorescent lamps in the kitchen stopped working. I
    > > replaced with the other pair in the same big box on the ceiling. They
    > > still didn't work. Then I bought a ballast from Home Depot, a magnetic
    > > type, and installed it. One of the two bulbs can flash with dim light.
    > > I did this before (in a different place). Replacing ballast and all
    > > was well. But this time I'm at a loss.

    >
    > > Can somebody tell me how I check the ballast or circuit? I did all the
    > > following measurements. Both ballasts are like this:

    >
    > > _________
    > > Blk | | Blu
    > > W | | Blu
    > > Y | | R
    > > Y |_________| R

    >
    > > Old ballast:
    > > Blk to W: 12ohm; Y to Y: <2 ohm
    > > Blu to Blu or R to R: <2 ohm; no continuity between Blu and R
    > > Blk to Blu: 3ohm; W to Blu: 10ohm

    >
    > > New ballast:
    > > Blk to W: 8ohm; Y to Y: no continuity
    > > Blu to Blu or R to R or : no continuity
    > > Blk to one Blu: 1.5ohm; Blk to the other Blu: no continuity
    > > W to the first Blu: 8ohm; W to the other Blu: no continuity

    >
    > > After I turned power on, I checked the voltage on the wires when the
    > > new ballast is installed:
    > > Blk: 120v; Y and W: 0
    > > Blu: 120v; one R: 0; the other R: 140v

    >
    > > Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
    > > 120V. The other 3 are 0.

    >
    > > I don't know what I should measure exactly. Thanks for help.

    >
    > > Yong Huang

    >
    > Do the tubes light up when you brush a hand over them?
    > Check your ground. Tubes must be within 1/2" of a
    > grounded metal surface (the chassis) or they won't
    > start.


    One of the tubes will show dim flickering light if I rub on it. The
    other one still doesn't work.

    To Art, I even moved the other known good tubes into these two
    sockets. They still don't work. I checked the inside of the sockets. I
    didn't see rust or anything. Thanks.

    Yong
     
    Yong Huang, Jul 21, 2008
    #3
  4. Yong Huang

    Tony Hwang Guest

    Yong Huang wrote:
    > On Jul 20, 8:59 pm, Father Haskell <> wrote:
    >> On Jul 20, 6:46 pm, Yong Huang <> wrote:
    >>
    >>
    >>
    >>> One pair of the fluorescent lamps in the kitchen stopped working. I
    >>> replaced with the other pair in the same big box on the ceiling. They
    >>> still didn't work. Then I bought a ballast from Home Depot, a magnetic
    >>> type, and installed it. One of the two bulbs can flash with dim light.
    >>> I did this before (in a different place). Replacing ballast and all
    >>> was well. But this time I'm at a loss.
    >>> Can somebody tell me how I check the ballast or circuit? I did all the
    >>> following measurements. Both ballasts are like this:
    >>> _________
    >>> Blk | | Blu
    >>> W | | Blu
    >>> Y | | R
    >>> Y |_________| R
    >>> Old ballast:
    >>> Blk to W: 12ohm; Y to Y: <2 ohm
    >>> Blu to Blu or R to R: <2 ohm; no continuity between Blu and R
    >>> Blk to Blu: 3ohm; W to Blu: 10ohm
    >>> New ballast:
    >>> Blk to W: 8ohm; Y to Y: no continuity
    >>> Blu to Blu or R to R or : no continuity
    >>> Blk to one Blu: 1.5ohm; Blk to the other Blu: no continuity
    >>> W to the first Blu: 8ohm; W to the other Blu: no continuity
    >>> After I turned power on, I checked the voltage on the wires when the
    >>> new ballast is installed:
    >>> Blk: 120v; Y and W: 0
    >>> Blu: 120v; one R: 0; the other R: 140v
    >>> Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
    >>> 120V. The other 3 are 0.
    >>> I don't know what I should measure exactly. Thanks for help.
    >>> Yong Huang

    >> Do the tubes light up when you brush a hand over them?
    >> Check your ground. Tubes must be within 1/2" of a
    >> grounded metal surface (the chassis) or they won't
    >> start.

    >
    > One of the tubes will show dim flickering light if I rub on it. The
    > other one still doesn't work.
    >
    > To Art, I even moved the other known good tubes into these two
    > sockets. They still don't work. I checked the inside of the sockets. I
    > didn't see rust or anything. Thanks.
    >
    > Yong

    Hi,
    Did you check the groundiung of the fixture or not? Those lamps are
    cheap, why not try a pair of brand new one. Also there are older 40W
    lamps and newer power miser 37W ones. They act different.
     
    Tony Hwang, Jul 21, 2008
    #4
  5. On Jul 21, 8:23 am, Yong Huang <> wrote:
    > On Jul 20, 8:59 pm, Father Haskell <> wrote:
    >
    >
    >
    > > On Jul 20, 6:46 pm, Yong Huang <> wrote:

    >
    > > > One pair of the fluorescent lamps in the kitchen stopped working. I
    > > > replaced with the other pair in the same big box on the ceiling. They
    > > > still didn't work. Then I bought a ballast from Home Depot, a magnetic
    > > > type, and installed it. One of the two bulbs can flash with dim light.
    > > > I did this before (in a different place). Replacing ballast and all
    > > > was well. But this time I'm at a loss.

    >
    > > > Can somebody tell me how I check the ballast or circuit? I did all the
    > > > following measurements. Both ballasts are like this:

    >
    > > > _________
    > > > Blk | | Blu
    > > > W | | Blu
    > > > Y | | R
    > > > Y |_________| R

    >
    > > > Old ballast:
    > > > Blk to W: 12ohm; Y to Y: <2 ohm
    > > > Blu to Blu or R to R: <2 ohm; no continuity between Blu and R
    > > > Blk to Blu: 3ohm; W to Blu: 10ohm

    >
    > > > New ballast:
    > > > Blk to W: 8ohm; Y to Y: no continuity
    > > > Blu to Blu or R to R or : no continuity
    > > > Blk to one Blu: 1.5ohm; Blk to the other Blu: no continuity
    > > > W to the first Blu: 8ohm; W to the other Blu: no continuity

    >
    > > > After I turned power on, I checked the voltage on the wires when the
    > > > new ballast is installed:
    > > > Blk: 120v; Y and W: 0
    > > > Blu: 120v; one R: 0; the other R: 140v

    >
    > > > Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
    > > > 120V. The other 3 are 0.

    >
    > > > I don't know what I should measure exactly. Thanks for help.

    >
    > > > Yong Huang

    >
    > > Do the tubes light up when you brush a hand over them?
    > > Check your ground. Tubes must be within 1/2" of a
    > > grounded metal surface (the chassis) or they won't
    > > start.

    >
    > One of the tubes will show dim flickering light if I rub on it. The
    > other one still doesn't work.
    >
    > To Art, I even moved the other known good tubes into these two
    > sockets. They still don't work. I checked the inside of the sockets. I
    > didn't see rust or anything. Thanks.
    >
    > Yong


    Wrap a grounded wire around the tube (watch the end so
    it doesn't short out a terminal pin). Tube should light up
    with no problems.
     
    Father Haskell, Jul 22, 2008
    #5
  6. Yong Huang

    Yong Huang Guest

    On Jul 20, 5:46 pm, Yong Huang <> wrote:
    > One pair of the fluorescent lamps in the kitchen stopped working. I
    > replaced with the other pair in the same big box on the ceiling. They
    > still didn't work. Then I bought a ballast from Home Depot, a magnetic
    > type, and installed it. One of the two bulbs can flash with dim light.
    > I did this before (in a different place). Replacing ballast and all
    > was well. But this time I'm at a loss.
    >
    > Can somebody tell me how I check the ballast or circuit? I did all the
    > following measurements. Both ballasts are like this:
    >
    > _________
    > Blk | | Blu
    > W | | Blu
    > Y | | R
    > Y |_________| R
    >

    ....
    >
    > Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
    > 120V. The other 3 are 0.


    This is a follow-up to my question. I solved the problem by finding
    out how dumb I was. The two red wires on the ballast are supposed to
    each connect to each of the two red wires in the box (I mean the box
    that has the lamp sockets). But instead I accidentally connected the
    two red wires on the ballast to themselves, and did the same to the
    two red on the box. No wonder the socket the two red wires go in
    didn't have power. It's embarrassing to admit it. But people in this
    newsgroup seem quite friendly so I thouhght it a good idea to post a
    follow-up. Thanks everyone.

    Yong Huang
     
    Yong Huang, Jul 27, 2008
    #6
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