Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

[goodpsusearch]

This came to me dead. 5vsb was 1.21V, no burnt components inside, all the caps were tested in circuit and out of circuit when needed and were found ok.

But let's see if it is worth repairing...

-Passive PFC

-Full input filter with 4 Y Caps and MOV protection!

-GBU606 6A bridge rectifier

-2x 560uF 200V YC caps. Their real capacitance is 505uF and 510uF, so they are in specs.

-2x D209L (Ic = 12A, Ic pulsed = 25A)

-DM311 IC regulates 5VSB

-2005ASZ chip of the year PWM.

-Adequate heatsinks for 300W

-The soldering is not good. Long uncut leads could lead to short circuit

-Sleeve bearing Globe fan thermally controlled from an add-on board attached to secondary heatsink.

5vsb: 2x1500uF 10V YC

-3.3V: SB3045ST (30A), 1x 10V 2200uF YC & 1x 10V 1500uF YC

-5V: MBR6045PT (60A), 2x 10V 2200uF YC

-12V: S30C60(30A), 1x 16V 2200uF YC & 1x 16V 1800uF YC

The label claims it has dual 12V rails which is a lie.

[goodpsusearch]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

I fixed it!

There was an smd diode on the PCB that was shorted. The diode was in paraller with another diode that was found ok. I replaced it with a general purpose diode. The new diode is also smd, but bigger sized compared to the original. That will hopefully keep it from failing again.

The 5vsb came alive and the psu works without any problem.

[momaka]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

Congrats!
Seems like Deer/Allied/Solytech has started to pick up their at a little bit now. No more 2-transistor 5VSB either - they are learning!!!
I wouldn't call this PSU excellent by any means, but it is decent enough and definitely worth fixing, so good thing that you did .

[Pentium4]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

Good job! Nice save It looks good, and capable of 300W. Might get a little loud though.

I like the newer heatsinks they're using, they have quite a bit of fins.

Those YC caps should last a while but should be replaced eventually, especially with how crammed they are in there. Also, check the oil in the bearing of that Globe Fan. It might need some oil!!! Seen quite a bit of them fail

I think it's funny how they heatshrinked that little cap (to the left of C17)

[goodpsusearch]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

I tweaked the fan controller, putting a 9.13Kohm resistor in parallel with the thermistor to make the fan move more air because the psu was cooking itself when I tested it with a Pentium 4 Prescott 3GHZ, nvidia 6600GT, midi ATX case with most of its ventilation holes blocked. Now it gets loud If I had recapped it with Japanese capacitors I would put a bigger resistor, maybe 10kohm or 12kohm.

I oiled the fan with singer sewing machine oil.

I was impressed with the voltage regulation. All the values were very close to nominal and they were steady during all the tests.

[c_hegge]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

Nice.

btw, here's what Solytech has been up to lately - http://hardwareinsights.com/wp/aywun...pply-review/3/. That one was overrated by Aywun, but if it were sold as a 450W unit and had better caps, it would actually be quite a decent product. I ended up recapping it and using it in a new PC I built for my grandmother recently, which won't push it much harder than 150W as it only has integrated Intel graphics.

[Agent24]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

Solytech have never been terrible, in New Zealand they came under the brand 'Hyena' and they were not great but still a good step away from being the worst.

They always had the biggest heatsinks out of the budget PSUs I saw, they had line filters etc and they had proper gauge wire.

The things that let them down the most were the Fuhjyyu capacitors and the shitty fans.

[c_hegge]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

Solytech have never been terrible...

They can be...

[Agent24]

Re: Allied AL-300TFX the best Allied/Deer I've seen so far, still failed

They can be...

Well, that one is pretty shitty. The heatsinks are almost as lame as an ancient TL494 based AT PSU I have. Maybe they have got worse in recent years? The ones I saw here in NZ were Hyena, they all looked like this: https://www.badcaps.net/forum/showthread.php?t=24673 (Minus the PPFC choke)

Not bad apart from rubbish capacitors and probably the fan too.