First post, by havli
I discovered this board in storage and realized it possibly could make great little late DOS and win9x PC. I used this board in 2015 I think for some benchmarks, it definitely worked fine back then. It still posts now, even loaded overclock of 6% from the old times 😁
The problem is it doesn't recognise any keyboard - PS/2 and neither USB. I suspected the overclock to mess up stuff (although it was perfectly stable in the past). So I cleared the CMOS.... didn't help. The board is definitely alive as it even booted DOS from attached SSD before I cleared the CMOS. Now it is stuck at the message "defaults loaded, press f1 to continue".
I measured the voltages across the board and it is more or less as expected (1.1V for CPU, 1.8V for DDR2) and PSU also seems to be fine (12V, 5V, 3.3V, 5V SB). But all usb ports (there are 8 of them) and both PS/2 ports only read 3.4V. There are fuses to protect these ports from over current. But they read 3.4V on both sides, so they seem to be fine, the problem must be before them. The PSU is microATX FSP200-50GSB, it is relatively new and works fine with different boards.
I always thought these ports are powered either from 5V or 5V SB rail directly. Some boards even have jumper to confugure this (not this one). I am sure there are people experienced with repairs of PC hardware. 😀 Any ideas what could be wrong here?
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