Re: PSU no start on some PCs, ok on others



You'd think that, but actually the Athlon 1.8GHz is the Shuttle the PSU came with. Today I opened it up again, and this time I noticed a few bad capacitors (one leaky, 2-3 slightly bulged), so [B]kc8adu[/B], you got it there (and they are indeed Fuhkkyu, the bad ones are 1000uF, 10V, black - don't know color codes or anything).

Any suggestion on a reliable substitute?Re: PSU no start on some PCs, ok on others



You'd think that, but actually the Athlon 1.8GHz is the Shuttle the...

This is not the same PSU I mention in my other thread, it's from an old Shuttle Athlon XP, 200W Achme thingy. It appears:

1. half dead (motherboard LEDs come on, but nothing happens when pressing the power button) on these machines:
- Athlon XP 1.4GHz
- Athlon XP 1.8GHz
- Pentium 4 3.06GHz

2. perfectly alive on:
- Celeron 600MHz @900MHz (ancient overclocker, how I loved it!)

Considering that it starts only the weakest machine, I'd say that it just can't produce enough juice, whether on the main rails or the standby rail....

Re: No boot and random shutdown



You explanation makes perfect sense, and I am not at all happy with those low voltages. The PSU is 2 years old though, Dell must have specified it incorrectly for it to go off spec already. Summers are pretty hot and humid in Japan (where the PSU originally was), but hey, still too early!

Anyway, it's done it again!!

Stress testing ok for a couple of hours, constant temperature (just 42°C for the CPU, 30 something°C for the other sensors), the voltage increased a bit when i quit prime95 (regulation not...

Re: No boot and random shutdown

Hi guys, thanks all for all the suggestions / info.

I'm stressing the PSU right now on yet another PC (old athlon Xp 2200+... I really should start to throw away some stuff, at least P3 era components!! ). The 12V is, according to the monitoring utility, [B]a bit out of spec: 11.264V[/B], without fluctuations. 5V is 4.86V, 3.3V is 3.28V, so within 5%. With a meter, 5VSB was 4.85V and 12V is 11.4V (I don't know what to trust more, the crappy multimeter or the internal probe), 5V also was slightly more, all very stable (but again,...

Re: No boot and random shutdown



... and in fact today the little bugger started again .
I also agree on the fact that some machines seem to have more problems than others: my guess (totally unsubstantiated by any hard fact) is that for one reason or another the PSU can't cope with the current demand, so it either fails to start or shuts down, and of course different machines put different loads on it.
Whether this is a problem fixable by changing capacitors or something else... I have no idea.

starfury1: YES, it is a completely standard...

Re: No boot and random shutdown



Thanks, but don't go look for it, I got it, here:

[url]https://www.badcaps.net/forum/showthread.php?t=4961&highlight=liteon[/url]

and here:

[url]https://www.badcaps.net/forum/showthread.php?t=4929[/url]

stevo1210's problem does indeed sound like mine, but my PSU doesn't make any funny noises and it doesnt bootloop: it either starts and then randomly shuts down (moments or hours later) or just stays off.
The 5V standby should be ok: there is an LED on the mobo that...

Hi all,

First post here, I found the site looking for my problem... which is, well, the title says it all I guess. The PSU is a Liteon PS-6351-1DFS from a Dell Dimension 8400, I saw it mentioned already in this forum. It started as random shutdowns, then the PC wouldn't boot at all unless the PC was unplugged and left to rest for some time (few minutes to hours). The PSU behaves exactly the same on two other PCs: first time in it works beautifully, very silent, even under heavy load (2x Prime95 on Athlon X2 @ 2500MHz and P4 Northwood @ 3GHz). Then, the next day, nothing. I actually...