Sanguan sg-t2200 problem- Mtbr.com
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  1. #1
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    Sanguan sg-t2200 problem

    My brand new sanguan sg-t2200 light is not working properly.
    -Everytime i ramp the power up past 'low' it lasts for about a minute and then powers back down to 'low'
    -Sometimes it will power up one level before reverting to low.
    -I tried it with a different battery and it did the same thing, so im sure its the light
    - i have tested it stationary in my house and on fast moving descents on cool nights and produced the same results.

    Is this a common problem and/or something i can fix? it was a group purchase from a friend of a friend so i dont think i'll be able to come up with the receipt for warranty.
    Thanks

  2. #2
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    Sounds like a thermal protection scheme working. Is the body of the light hot? I'd bet it is not. It is pretty common for the cheap Chinese lights to have a poor thermal path to get heat from the LEDs and driver board out to the housing.
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

  3. #3
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    Yes it has felt hot to the touch sometimes but not everytime. at times the light has not even been on for a minute before powering down.
    Unfortunately it wasnt exactly a cheap light! and all of my friends lights who got them are working fine. is this something i can fix or is it just not worth it?

  4. #4
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    As far as "worth it" to fix, probably not. I don't know if Sanguan lights are special or what, but similar looking lights are available for less than $30. Since it sounds like warranty claim is not possible, there is not much to lose in opening it up and looking for obvious problems. If you have some electronics background you might be able to go beyond the obvious and test for bad components etc. Poor soldering is common in the Chinese assembly process.
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

  5. #5
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    ok thanks

  6. #6
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    in case anyone was interested.... i had a friend good with electronics open up the light....found some melted wire and poor sodering. after addressing those issues, the light works perfect, so far anyways after 1 ride.

  7. #7
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    Cool!

    Poor soldering is a pretty common problem.
    GoPro adapters for bike lights http://www.pacifier.com/~kevinb/index.html

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