HP Vectra vl 420 dt short circuit protection problem... (168 Views)
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Occasional Contributor
Toomas Teekivi
Posts: 6
Registered: ‎10-27-2008
Message 1 of 3 (168 Views)

HP Vectra vl 420 dt short circuit protection problem...

[ Edited ]

Hi! I have owned an HP Vectra vl 420 dt computer for a few years. A few days ago it didn't start, instead it emitted a beep code consisting of two beeps (which indicates short circuit protection as you can see from here: http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&locale=...
ypeId=12454&prodSeriesId=45010). This is not the first time this kind of beeping occurred. The other time the problem was fixed by simply plugging out the power cord.

I have tried several things in attempt to fix it:
1) plugging out the power cord, as the official manual suggests;
2) cleaning the motherboard with vacuum cleaner (motherboard and other components stayed in their places);
3) testing the power supply unit by "triggering" it (http://www.duxcw.com/faq/ps/ps4.htm);
4) removing the CMOS battery;
5) replacing the CMOS battery with a battery taken from other PC;
6) unplugging all the cords from motherboard except the main power cord and the front panel power switch;
7) plugging out the power cord, pressing the power button and waiting for more than half an hour (as suggested on 5 answer


None of the above mentioned actions helped.

One interesting thing is that after changing CMOS battery, the power indicator led stayed on, unlike before touching the battery.

I'd greatly appreciate any suggestions, solutions and information about this certain problem.

Thanks in advance! :D

 

P.S. This thread has been moved from Archived Desktops and Workstations Boards-Windows based to Business PCs - Evo, Deskpro, Vectra, Kayak, Brio, e-PC*. -HP Forum Moderator

Honored Contributor
Pieter 't Hart
Posts: 1,984
Registered: ‎09-04-2002
Message 2 of 3 (168 Views)

Re: HP Vectra vl 420 dt short circuit protection problem...

>>> 3) testing the power supply unit by "triggering" it <<<

you didn't report the result of this test?

There are many articles about using an ATX-PSU as PSU for other purposes than in a PC. Mounting a switch between pins 14/15 is not harmfull as long as you connect some load across the outputs.

You can use a disk drive as load (uses both +12V and +5V).
when switched on check the output voltages of the PSU using a Voltmeter.
Try this with all component that are directly connected to the PSU adding one at a time., monitor voltage as devices are added.

- you can remove as much components as possible (memory modules, interface cards, Internal USB cabling) and try to locate the offending component

- search the internet for keyword "badcaps".
Capacitors on motherboard tend to deteriorate. and may need replacement.
(if this device is worthwhile to you).
This can also happen with cap's inside the PSU.

Occasional Contributor
Toomas Teekivi
Posts: 6
Registered: ‎10-27-2008
Message 3 of 3 (168 Views)

Re: HP Vectra vl 420 dt short circuit protection problem...

Thanks for the response, but today, for some reason, it just started to work. I'll follow your instructions whenever the problem occurs again.

The triggering test was actually successful, the PSU's fan started spinning.
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