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LOW VOLTAGES POWER SUPPLY

I'm servicing one colord tv ,the problem is low voltages instead of 190 volts i only got 70 volts on the horezontal output

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  • Anonymous Nov 07, 2007

    What should the +B voltage be for a Philips 25PT2252/79R TV be.

    I have 120 volts and a narrow picture.

  • Anonymous Nov 07, 2007

    I have a Philips 25PT2252/79R TV.Narrow picture + B voltage 120 volts.



    Any clues

  • desmond cassisa Nov 07, 2007

    I have a Philips 25PT2252/79R TV. Narrow picture. +B voltage 120volts

    Any clues

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  • 372 Answers

Hi. It will be easier to help you if you tell us the make & model of your tv set.

Posted on Sep 21, 2007

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Would that be an LED (Light Emitting Diode), blinking on the back of the Power Supply?

If so, instead of being an LED that indicates the Power Supply has power to it, it has now turned into a diagnostic LED (Light), and is telling you the Power Supply is bad.

Do you have an economical multimeter, so I can guide you in testing the 3 low DC Voltages; that come out of the Power Supply?
An economical multimeter can be purchased for as little as $5 to $12.
I have seen them on checkout aisle racks, in major discount stores.

The dangerous high AC voltage, is kept contained within the metal case of the Power Supply.
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The Power Supply is a Converter.
It converts the high AC voltage into 3 low DC Voltages;
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In comparison two D cell flashlight batteries produce 3 Volts DC.

OR;
Use a KNOWN to be good, Compatible power supply; for a temporary test unit.

{"Honey, I'm going to borrow the Power Supply out of your computer.
I'll put it back when I'm done."
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Also, is the inside of the computer dirty?
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Post back in a Comment.
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next step is to remove the board and replace the capacitor, using a soldering iron and making sure to solder with no slop.
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  • proceed as given after your power supply is ok (your statement)
  • isolate power supply from h/output stage.
  • check diodes & capacitors connected with flyback transformer.
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  • ckeck h/output transistor.
  • connect supply to h/output stage.
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  • hope this will help.
  • good luck

still there is a drop in voltage then your fly back transformer faulty.

 

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