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power supply

Discussion in 'Troubleshooting and Repair' started by vitorG, Dec 18, 2012.

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  1. vitorG

    vitorG

    9
    0
    Aug 13, 2012
    Hello I have a power supply from a satellite receiver that when I check the output voltages they are pulsating from 0V to the right voltage and back to 0V. is it capacitor or rectifier problem??:confused:
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,482
    2,830
    Jan 21, 2010
    It's hard to be certain.

    You should check both.

    If *all* the rails pop up to the correct value, then it's far less likely to be the rectifiers. (And the one's you're looking at will be the ones on heatsinks, NOT the ones which rectify the mains)
     
  3. vitorG

    vitorG

    9
    0
    Aug 13, 2012
    thanks Steve I'll check also the voltage regulator it seems like a regulator problem...
     
  4. Relayer

    Relayer

    39
    0
    Dec 15, 2012
    Sounds like the power supply is hiccuping due to a short in the secondary of the unit.
    Would it be possible to get a photo of the units circuitry?
    Regards,
    Relayer :D
     
  5. Jotto

    Jotto

    120
    0
    Aug 24, 2012
    If you have a PMPS there is a cap on the PWM and FET, value should be about 47-100mf usually at 50vdc. This is a very common problem with this type of power supply.

    Not sure what type of receiver you have.
     
  6. vitorG

    vitorG

    9
    0
    Aug 13, 2012
    Thank you guys. Jotto the receiver is a sonicview 360 premier it is discontinued but I'd like to get it working...
     
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