fault in laptop charger 65 W lenovo usb c (adlx65ycc3d)

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  • claws77
    Senior Member
    • Apr 2024
    • 103
    • India
    #1

    fault in laptop charger 65 W lenovo usb c (adlx65ycc3d)

    this is a cross post.
    the laptop charger does not work. no output voltage.
    removed 18V and GND cable from secondary, left ID cable-- suspecting short in output cord and then measurements were made.
    input cord is fine -- checked. 220 V AC
    primary transformer voltage (V_DE) is fine - checked 310.1 VDC
    secondary transformer voltage is 0V (V_AB) -dont know why
    C1 and C2 are electrolytic caps marked at 470uF but reads 987 uF -- seems connected in parallel. V_c1 =0V and V_c2 = 0V.
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      removed 18V and GND cable from secondary, left ID cable-- suspecting short in output cord and then measurements were made.
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