Question about Philips VR550 VHS VCR

3 Answers

Blown fuse/ power supply vr550

Fuse keeps blowing at power inlet a flash appears on what I think is a rectifier diode/transistor

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  • Del bone Sep 24, 2008

    vcr only used twice

  • Del bone Sep 24, 2008

    thanks for info .Please advise on component and spec. can solder this in thanks.Del bone

  • Del bone Sep 24, 2008

    PS what is fuse value i.e.milamps

    Del bone

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3 Answers

Could not locate heatsink previously mentioned,only a "v" shaped slot beneath tranistor close to transformer,could you please furnish information on transistor so that I can replace it.

Delbone

Posted on Sep 29, 2008

Could not locate heatsink, component in question is located over a small "v" slot about 1/2 inch long in front of transformer, hope this helps to locate said component.
Del bone

Posted on Sep 27, 2008

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  • Master
  • 4,234 Answers

There is a small glass fuse there as well. These units have aswitch mode power supply and the transistor that is attached to the heatsink sometimes gets shorted. This is the most likely problem. If you feel comfortable working on these and can solder, let me know and I'll provide more detailed information.

Dan

Posted on Sep 24, 2008

  • ABRsvcs Sep 24, 2008

    The fuse is usually a 3.15 Amp fuse (GMA type). I need to look up the transistor.



    Dan

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The likely cause of this is a dead short in the power supply. I don't receal the specifics of this unit, but there should be a set of four(4) diodes or a single bridge rectifier in the main power supply area. Check this/these for a direct short using a diode checker. Other than that, the output transistors being shorted can cause hte same symptom. Without seeing the actual unit, I can not tell for sure. If you know how, check the output transistors as well. Report your results here.

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Hello
If fuse blows off repetedly, it shows that there is a direct short inside the power supply section. You just check the mains rectifier diodes for short. iIf a rectifier stack is used desolder it out and check for short. In some sansui sets, ther is a metal oxide variste connected across the supply line inside directly. It is for line spike suppression and an overvoltage protection. If any of the above appears on the power line, the varistor will get shorted, and the fuse will go out, to prevent further damage to the circuits. Check that varistor for short. Check the resistance across main filter capacitor for any direct short. If it seems shorted, check the switching transistor for collectror to emitter leak, Resolder it out and check. These are the main reasons for blowing fuse. If the switching transistor has got leaked, you must check the entire SMPS control section, especially in case of used zener diodes, before replaceing a new transistor. OK.
If you wants anu further assistance, inform me through Fixya. Ok.

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In the amp section any semi-conductor on the heat-sink.

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Very often they have holes, or damage, or have burnt up with this kind of fault.
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