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Low SMPS current output

Discussion in 'Troubleshooting and Repair' started by mido_ameer, Nov 9, 2012.

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  1. mido_ameer

    mido_ameer

    2
    0
    Nov 9, 2012
    I have 12VDC switching power supply adapter of my ADSL router
    when I connect it to the mains the router doesn't come on, it has to stay 3 days until the router switches on and operate.
    when I tested the power supply's output volt it is 12V (11.88V), but when I connect a load (12VDC-150mA computer fan) the voltage drops to 2.5V, where even the fan cannot rotate.
    I tried to change the opto-coupler and its switching transistor but no result.
    Can anybody got the knowledge help me, please.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,808
    2,438
    Nov 17, 2011
    Get a new power supply. You're dealing with dangerous voltages here and if you don't know what you do you risk your life.

    Harald
     
  3. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Word of advice... It's generally NOT a good idea to leave improperly or not functioning items plugged in, especially for 3 days :confused: this can lead to very bad things, like fires...

    As Harald said just get a new wall wart, they are about $5 delivered from China... Just match the mA rating to what the router needs plus at least 25% the higher the rating the better even if it's 2 or 3 times what you need as long as it's cost effective...
     
  4. mido_ameer

    mido_ameer

    2
    0
    Nov 9, 2012
    Thanks guys

    Thank you guys for replying, but I was wondering how to fix it to know more about switching power supplies and learn it :D
     
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