Question about Dell (58GGC) Motherboard
The computer is a Dell Dimension (300?). It uses the standard 24 pin supply. The computer will not power up. With the PSU disconnected or connected to the MB I can read approximately 5V on the Supply voltage pin and +3.85V on the Power On pin which I believe to be correct in the PSU off state. This computer uses a power switch/USB circuit card for power up. I have tested this card in another unit and it functioned normally. I measured +3.84V on input connector and across switch (switch open) as well as 0V (switch closed). The +5V supply was on in both states. In the unit in question the voltage across the power switch (switch open) is low at only +0.75V (even though the PSU input connector still measures 3.84). So I am dropping approximately 3V somewhere on the MB. This is the case whether the CPU is installed or removed. Where should I look for the voltage loss? Is there a component(s) sharing this signal line? Where on the MB does this Power On signal go...CPU...RAM...etc? Any help would be appreciated.
CHECK YOURE POWER HOOK UP ON THE BOARD MAKE SURE THEY ARE HOOKED UP ON THE RIGHT ONE IF THEY OR OFF ONE PEG IT WILL NOT POWER UP
Posted on Aug 21, 2007
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