Re: PC Power supply
- From: Franc Zabkar <fzabkar@xxxxxxxxxxxxxxxxx>
- Date: Mon, 28 Apr 2008 06:01:18 +1000
On Fri, 25 Apr 2008 13:22:02 -0400, "Charlie Bress"
<left@xxxxxxxxxxxxx> put finger to keyboard and composed:
My son has an E-Machine T3828 that will not power up. Unfortunately he is
around 100 miles away so I do not have more information. There were no
changes made to the PC that might have caused this.
At first glance it is easy to blame the P/S itself, but a new replacement
did not help.
A detail: He reports that with either supply there is a single LED on the
M/B that lights up. What controls this light?
On either P/S there is no other sign of life. No fans turn on.
What are the likely causes?
I have considered some. The power switch may have failed. Or the mechanical
link from the front panel to the switch.
Use a multimeter to monitor the PS_ON pin (pin 14, green) in the ATX
PS connector. It should go low when you press the front panel power
switch. The +5VSB pin (pin 9, purple) should measure +5V.
See http://pinouts.ru/Power/atxpower_pinout.shtml
If PS_ON doesn't go low, then something is wrong with the motherboard.
In this case it won't be the CPU or the RAM because neither are
powered in standby mode.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
.
- References:
- PC Power supply
- From: Charlie Bress
- PC Power supply
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