Thread: Does anybody use OPUS 120PSU with MB870? - Problem

Does anybody use OPUS 120PSU with MB870?

Hello, I have ITX case from OPUS with OPUS 120PSU It`s rebooting when come to Windows XP logo (tested a lot of times) sometimes (rarely) it`s boots to the end & then reboots again, but with normal (desktop) ATX PSU it`s not!

its wired by 20 ATX connector & 4-pin P-IV 12V connectors from DCX.3.120p to motherboard Ibase MB870 but it works also with only the 20 ATX connector.

Tried with AC power loss - off/on/previous state - same result

I used for tests:
Pentium 4 2.4GHz (512KB)
& Celeron 1,7GHz (128KB)
& Celeron 2.0Ghz (128KB)
with 256MB DDR memory & even 128MB DDR, - same results
So the total power consumption is much lesser than 120Watts

LED - blink 1 time after I turn on system, then it`s green all the time & is green before, after & in time system rebooting. (not blinking or smth.)

also I tried to test memory under DOS & used SEM (like SNM in windows) to test stability it works fine (under DOS).

also I noticed that voltages are not same from DCX.3.120P & my ATX are not the same, and voltages from DCX.3.120P are changing all the time.

voltages (from BIOS monitoring):

ATX DCX.3.120P
1.50 1.49-1.53
3.39 3.35-3.39
5.16 5.01-5.08
11.97 12.20-12.22
-11.78 -12.40-12.61
3.12 3.11-3.15
5.09 5.01-5.06

There is no additional stuff connected to the MB (like USB/PCI devices & so on), also tries to connect HDD with another power supply - with no result.

So it`s rebooting inminimal configuration like: MB870 + CEL 2.0 (have lesser power consumption than CEL 1.7 (52.8W against 63.5W)) + 128 DDR RAM

Also doublecheked all temp - they are not more than 50`C.