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Slow start up

Discussion in 'Electronic Repair' started by z, Nov 4, 2006.

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  1. z

    z Guest

    I have the following symptoms on my panasonic tx-w28r3

    Slow start up, getting progressively worse. I understand
    this should be a dried out capacitor. Any ideas where
    to look?
     
  2. Arfa Daily

    Arfa Daily Guest

    Power supply. Suspect any small electrolytic positioned close to any
    component which runs hot in normal use, including nearby heatsinks.

    Arfa
     
  3. b

    b Guest

    z ha escrito:
    euro3 chassis.
    be careful when poking around in the power supply. there are high
    voltages stored there, in the main filter capacitor which can give a
    nasty belt even when the unit is unplugged. If at all in doubt about
    your ability to handle this , or solder , get the set to a tech.
    -B
     
  4. Arfa Daily

    Arfa Daily Guest

    Absolutely agreed

    Arfa
     
  5. z

    z Guest

    What sort of high voltage, 220v ? Which capacitor is that, the big
    electrolytic one?

    I already poked around, and I am still here, so maybe it alright
    after all?
     
  6. Arfa Daily

    Arfa Daily Guest

    That's the cap. So long as the psu has started up, charge on that cap is not
    normally an issue, as when you power off, the primary side circuitry will
    keep drawing current from the cap until the voltage across it has dropped
    low enough that psu operation can no longer be sustained. The problem comes
    if the psu has not started up. That cap will be charged to the peak voltage
    of the line power - around 360v in the uk, but less in the US - and it will
    remain so after the power has been removed. A cap in good condition can stay
    charged enough to give you a nasty belt for hours, and in some cases days,
    after removal of power. Bear in mind also, that this voltage is derived
    directly from the line power, with no isolation or current limiting, other
    than the input fuse, so is potentially lethal.

    Arfa
     
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