I had to change the ATX 20-pin contact on my EP-8KHA motherboard, but I'm afraid I managed to damage one of the connecting points. As far as I can tell, the -5V is not connected to the circuits on the board any longer. Could someone please guide me to another point that is electrically the same as where the -5V pin of the 20-pin contact should be connected? (Then I can connect the -5V pin to that point using a cable.)
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Check the voltage on the Power supply. (5V STB is on pin no. 9).
Check the voltage (on pin no. 9) from the back of the motherboard on ATX socket.
Check the voltages on the Front Panel connector for 3.3v, 5v and ground.
Check for shorting by placing one probe of multimeter on the ground and the other one by one in pin no. 1,2, 4, 6, 8,9,10,11,12,14,19,20 also on the CPU connector. If there is shorting the problem is with some component on the motherboard.
I think probably the Power Supply (SMPS) is faulty.
Black=0V(GND) Yellow=12V Red=5V Orange=3.3V Purple=5Vsb(everytime on) Gray is PWRGOOD or PWROK(pwr=power) must be at 5v White=-5V(optional) Blue=-12V Green is PWRon must be connected to a black wire to turn on the PSU
Looks like it comes with a 550w power supply, so anything in that range would be fine.
Below are the specifics if you need them.
Best of luck,
" Replacement power supply for Compaq Presario SR2020NX- 550 Watt Replacement Power Supply Upgrade - One (1) 20+4 ATX Power Connection - Two (2) SATA Connections - Four (4) large molex connector (4-pin) - One (1) One (1) floppy connector (4-pin) - One (1) ATX 12V connector (4-pin) - One (1) 6-pin PCI-Express Connection (6-pin) - ATX Form Factor - 575 Watt Replacement Power Supply - Input Voltage: 100 - 240 Volts AC - Width: 5.75"; Height: 3.25"; Depth: 6.0" - Voltage: +3.3V (38A); +5V (40A); +12V (25A); -5V (0.5A); -12V (0.8A); +5V (2A) SATA Support - Supports both 20 and 24 pin motherboard. Great Power Supply Replacement or Upgrade. Compaq PSU Presario SR2020NX Power Supply Replacement"
ATX Version 1.2 - 20 wire motherboard connector
The color scheme used for the voltages in the 20 pin connector holds for the other ATX standard power supply connectors. However, brand name manufacturers often build proprietary power supplies or make up their own color coding, so I wouldn't throw out a power supply that supplies 5V where you think it should supply 3.3V. It's more likely a proprietary design than a failure.
If the power supply had a problem then it is likely that the motherboard and/or the CPU got damage from that. I would check the 12V and the 3.3V lines from the PSU.
Without more information I cannot say specifically what the problem is. You can try disconnecting everything from the motherboard except video card, CPU, and RAM to see if it would work that way. If it does then you can start connecting devices until it does not work any more then you have found the problem. If that does not work at all then unplug the video card and RAM see if anything changes (you should get a beep code without the video or RAM). If nothing changes then either the CPU or motherboard is bad and the only way that I know of to find out which one is to either try the CPU in another motherboard or try a different CPU in that motherboard.