good day,

well i have here atx compaq psu that only spins its fan a second then
stops.its first symptoms was low voltage. I measure the voltage on red
- +4 , yellow - +9 should be +12. Now when i try to turn it on again,
it only produces a jolt of energy then fan stops. is it a shorted
component on the secondary side? other possibilities.

regards,

ian

"yhan" wrote in message
oups.com...
good day,

well i have here atx compaq psu that only spins its fan a second then
stops.its first symptoms was low voltage. I measure the voltage on red
- +4 , yellow - +9 should be +12. Now when i try to turn it on again,
it only produces a jolt of energy then fan stops. is it a shorted
component on the secondary side? other possibilities.


Could be capacitors. The smoothing caps and/or the small value electrolytics
in the regulator circuit.

Dave

In message .com, yhan
writes
good day,

well i have here atx compaq psu that only spins its fan a second then
stops.its first symptoms was low voltage. I measure the voltage on red
- +4 , yellow - +9 should be +12. Now when i try to turn it on again,
it only produces a jolt of energy then fan stops. is it a shorted
component on the secondary side? other possibilities.

regards,

ian

What part number?
--
Clint Sharp

What part number?

hi!
its model is HP 212
PART NO. 278740-001

"yhan" wrote in news:1126688436.704976.312430
@g49g2000cwa.googlegroups.com:

good day,

well i have here atx compaq psu that only spins its fan a second then
stops.its first symptoms was low voltage. I measure the voltage on red
- +4 , yellow - +9 should be +12. Now when i try to turn it on again,
it only produces a jolt of energy then fan stops. is it a shorted
component on the secondary side? other possibilities.

regards,

ian


Do you have a proper load on the supply?

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hi,
i connected two hard disks in the supply.

i worked on a compaq recently that did the same thing.
it didn't like having a second cdrom(burner).
it worked fine with either drive but as soon as i put both in it would
power on for half a second then shut down.
i decided to leave out the cdrom and it worked fine.
have you tried it with just the floppy connected to see if it posts?

yhan wrote:
hi,
i connected two hard disks in the supply.

hi tom,

not yet. i'll try sooner. i also tried turning it on while no load but
w/ same effect.

ian

Dave D ha scritto:


"yhan" wrote in message
oups.com...
good day,

well i have here atx compaq psu that only spins its fan a second then
stops.its first symptoms was low voltage. I measure the voltage on red
- +4 , yellow - +9 should be +12. Now when i try to turn it on again,
it only produces a jolt of energy then fan stops. is it a shorted
component on the secondary side? other possibilities.


Could be capacitors. The smoothing caps and/or the small value
electrolytics
in the regulator circuit.

More probably the first : smoothing caps on the secondary sides, make sure
you mount low-ESR caps, you can gett them from another power supply with
another fault, (i.e. : an irreparable esemplar)

Dave



--
I.