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PSU operation question

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Name: JimDZ
Date: August 22, 2007 at 17:40:15 Pacific
OS: xp
CPU/Ram: 2.7 celeron/256
Product: e-mach T-2742
Comment:

Hi Ya'll, techno-challenged senior citizen here. My machine died. No nothing. I assumed PSU bad, so got a new one FSP Group ATX350-PA 300W from newegg. removed old one and installed new one. Nothing. I assumed it failed like the PSU on my old e-mach i400 did and new PSU fixed that one right up.

So now I try to do some troubleshooting on the old PSU and shorting the #13 & 14 pins in the big connector runs the fan and I measure some voltages from other pins and they seem OK.

Whats the trouble in my machine? Is it the power switch in the front panel and how can I check that out ? Thanks. Disappointed since I expected it to work after I put the new PSU in



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Response Number 1
Name: jam
Date: August 22, 2007 at 18:06:02 Pacific
Reply:

Power switches rarely fail.


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Response Number 2
Name: JimDZ
Date: August 22, 2007 at 18:23:22 Pacific
Reply:

Further troubleshooting, disconnected the power switch and it indeed has failed. No continuity between the terminals. Problem now is... pulled off the indicator lights for "ON" and HDD also and don't know which pins to connect to see if it will power up. Anyplace to get a motherboard picture or schematic?


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Response Number 3
Name: aegis
Date: August 22, 2007 at 18:38:02 Pacific
Reply:

It looks like there is an installation manual here:

http://www.google.com/search?hl=en&...


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Response Number 4
Name: aegis
Date: August 22, 2007 at 20:29:50 Pacific
Reply:

"No continuity between the terminals."

JimDZ, I hope you are aware that it is a momentary switch, not an on/off.


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Response Number 5
Name: JimDZ
Date: August 22, 2007 at 21:13:15 Pacific
Reply:

Aegis, well I figured that out after I got the MB manual from e-mach tech and read it. So now I do have a functioning switch and a new PSU that should work and an old PSU that seems not to be dead. But still no activity when I try to power it up with either PSU. I removed and checked the BIOS battery 3v indicates 3v on my voltmeter. Now what?


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Response Number 6
Name: Walter Mitty
Date: August 23, 2007 at 02:00:37 Pacific
Reply:

If the PSU is good, does the CPU fan spinup ? If not it may be a dead mobo or CPU!



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Response Number 7
Name: aegis
Date: August 23, 2007 at 10:10:49 Pacific
Reply:

The reason Walter Mitty says it could be a motherboard or CPU problem is because of the following.
When the power on switch is pushed, the motherboard signals the power supply to come up to full power. The motherboard then checks all the voltages and, if they are all withing specs, will send a 'power good' signal back to the power supply. If the power supply does not get this power good signal within a 'very short' time period, it goes back to minimum power mode.


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Response Number 8
Name: jam
Date: August 23, 2007 at 19:36:48 Pacific
Reply:

The PSU you chose is a decent one. Did you connect both the 20+4 pin main ATX plug AND the 4-pin ATX12V plug? The 4-pin plug supplies power to the CPU.


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