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Philips Boombox AZ790/12 The power supply AZ 787 has 0V DC out.

josefouchard 1119 10
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  • #1 21076915
    josefouchard
    Level 2  

    Philips Boombox AZ790/12
    The power supply AZ 787 has 0V DC out. What can I do?

    Quelqu'un sait-il si je peux simplement remplacer cette platine par une alimentation 220v AC/12V DC 2A du commerce?
    Does qualified somebody know if I could replace that PCB by a conventional power supply ? What is the out DC voltage & Amperes from the PCB ? Nowhere written
    Does Somebody can help to repair or replace that PCB ?
    Thank you very much to you. Close-up of the interior of a Philips AZ790/12 boombox with a visible power board.
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  • #2 21079889
    Telo
    Service technician RTV  
    Fit a typical power supply with the same voltage as the voltage on the batteries and the current should not be enough.
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  • #3 21080966
    josefouchard
    Level 2  

    Voltage of batteries is 9V 6 units.
    What is "current"? voltage or Amperage? Enough or not enough? Pls be more specific. Would it be risky to fitting a power supply of 12V?
  • #4 21118372
    Vortex1987
    Level 23  
    What size batteries are used there?
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  • #5 21118565
    aksakal
    Tube devices specialist  
    The battery type is indicated in the photo. The original power supply is for sale. https://ndsalesvs.pics/ product_details/89903488.html Pictured is a diagram of the original power supply. The image shows a close-up of a circuit board with numbers 1, 2, 3, and 4 marked on circuit components. Electrical schematic of the original power supply. Avoid experimenting with increasing the power supply voltage as this can lead to problems.
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  • #7 21118738
    aksakal
    Tube devices specialist  
    Why are you giving a damaging recommendation? The power drawn from the mains supply is 15W and the 9V 1A is only 9W. Do you want the subject author to be looking for a new power supply in a day or two? You need a 9V 2A power supply.
  • #8 21118827
    Telo
    Service technician RTV  
    What's written and what's in action is different, let the subject author test the equipment on a workshop power supply how much current it actually draws at maximum volume.
  • #9 21118866
    aksakal
    Tube devices specialist  
    Before writing any nonsense, you should, at the very least, read the technical specifications of the product - The Philips AZ790/12 has a total output power of 12 W RMS.
  • #10 21143054
    josefouchard
    Level 2  
    Hello,
    I installed one power supply 9V 5A. The box started. The display works, the radio works, I suppose the cassette works, but the CD player does not work anymore. The menu works but the reading does not start. The reading stays at 00. The disk turns OK, I can change the number of the music recorded but the mobile laser light does not move at all of its resting place. I think it is blocked. Does someone know anything in the repair of CD disk player?
  • #11 21143085
    bodzioluban
    Level 15  
    After all, it is possible to buy a 12v/2-4A power supply for less than £20 without any problem.
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Topic summary

The discussion revolves around the Philips Boombox AZ790/12, specifically addressing the issue of the power supply AZ 787 outputting 0V DC. Users suggest replacing the original power supply with a compatible one, emphasizing the importance of matching voltage and current specifications. The original battery configuration is noted as 9V from six units, and recommendations include using a 9V/2A power supply to avoid damage. One user reports success with a 9V 5A power supply, although they encounter issues with the CD player not functioning properly afterward. The conversation highlights the risks of using incorrect voltage and the need for careful testing of current draw.
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