Blowing Fuses

  bob1234 18:38 31 Dec 03
Locked

Happy New Year all.

New PC, AMD 1.6, 256MB DDR Ram, CD ROM nothing special, Working fine 24 Dec thru to 6pm 31/12 Now blowing fuses? Anyone suggest a possible cause? Thanks.

  johnnyrocker 18:42 31 Dec 03

which fuses and any idea what they feed? could be a trapped wire shorting to the case, etcmore info needed.


johnny.

  DieSse 20:19 31 Dec 03

Probably a faulty PSU, if it's the tower that's causing the problem.

  bob1234 20:49 31 Dec 03

Just the Tower itself. No trapped wires, am sure of that. The Monitor, printer etc are all OK.

  BlueMeanie 13:23 01 Jan 04

Accept that the PSU has blown...

Do NOT attemp to open the PSU or repair it (far too dangerous - I've tried it!), but call into your nearest PC shop or fair and purchase a new power supply unit. They are not too dear - take along your old one so thay match it up. At the fairs they cost from £12 upwards depending on specification.....

Regards and seasonal greetings.

  AubreyS 13:28 01 Jan 04

If its new, take it back. Its under warranty.

  bob1234 18:45 01 Jan 04

But why is everyone so sure its the PSU?

  Wilham 19:40 01 Jan 04

The mains goes into the psu, it's rectified into intermittent DC, smoothed by a capacitor (weakest link),current is chopped by a semicoductor, outflow almost shortcircuited by a choke/transformer, more smoothng, voltage sensed to provide feedback to a 14 dual-in-line integrated circuit that supplies the mark/space control (not the frequency) of the chopper.
There are refinements; above is the basic structure.
If one component blows then many of the diodes etc. break down as well, including the fuse in the plug. It's part of the design as a safety measure.

Is it the mains lead fuse that connects to the tower? What is the rating of the fuse that is blowing?

  Diemmess 21:20 01 Jan 04

AubreyS said it. Whatever the fault it is only days old. Don't weaken your case by delay.

The probability is a fault in the case switch or even in the PSU, because if it were later in the circuit, a fuse in the PSU itself would blow. It would be interesting to know exactly what has gone wrong, but in this case better by far to wheel out your chariot and return it!

  DieSse 23:17 01 Jan 04

"The probability is a fault in the case switch"

Impossible with ATX supplies - the case switch is merely a signal via the motherboard to instruct the PSU to turn on/off - it's nothing to do with the mains supply.

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