TL;DR: I'm troubleshooting an old PC that won't POST anymore and the only symptom out of the ordinary is that the PSU 3.3V rail is reading 3.7V on a cheap PSU tester. Can that be it??
I have an old PC that used to work fine (passing several stress tests and all), and now it won't post. It powers on, CPU and case fans spin ok, RBG lights turn on, but about 8 seconds later it turns off. Then after 2 seconds it turns on again and repeats the process. In the process I get no video and no POST beep (which I used to).
Here are the specs:
I'm now planning on probing the PSU with a scope. I have a few tools available for that, but I'm not sure what I should look for. Just voltage level and ripples? I know I should hook up some loads to reach minimum current specs, but I don't have the right power resistors handy.
There's a bit more info here:
View: https://www.reddit.com/r/buildapc/comments/o6ej8i/suggestions_for_troubleshooting_an_old_i53570_rig/?utm_source=share&utm_medium=web2x&context=3
Thanks!!
I have an old PC that used to work fine (passing several stress tests and all), and now it won't post. It powers on, CPU and case fans spin ok, RBG lights turn on, but about 8 seconds later it turns off. Then after 2 seconds it turns on again and repeats the process. In the process I get no video and no POST beep (which I used to).
Here are the specs:
- CPU: Intel i3-2100/i5-3570 (non-K)
- Mobo: Gigabyte GA B75M D3V
- RAM: Corsair Vengeance LP 8GB (2x4GB) 1600Mhz DDR3 C9 Black - CML8GX3M2A1600C9
- GPU: integrated Intel graphics
- PSU: Nameless 500W
- SSD: Kingston A400 240GB
- I've removed the mobo from the case and tested on my bench (table with non-conductive mat): no change;
- I've tested the rig with each RAM stick in each slot (there's 2 in this mobo): no change;
- I've removed both RAM sticks so the mobo ran without any RAM: the board beeps continuously without stopping or turning off... beep, beep, beep, beep, beep... so the beeper works. No video.
- I've replaced the i5-3570 with the i3-2100 I have laying around. No change, except in the way the CPU fan is driven:
- With the i5-3570: gently turns the CPU on at low RPM;
- With the i3-2100: full throttle, like the fan is a jet engine;
I'm now planning on probing the PSU with a scope. I have a few tools available for that, but I'm not sure what I should look for. Just voltage level and ripples? I know I should hook up some loads to reach minimum current specs, but I don't have the right power resistors handy.
There's a bit more info here:
View: https://www.reddit.com/r/buildapc/comments/o6ej8i/suggestions_for_troubleshooting_an_old_i53570_rig/?utm_source=share&utm_medium=web2x&context=3
Thanks!!