Enlight GPS-350CN-101

[pfrcom]

I've not had my hands on an Enlight power supply before, and this one seems an impressive build, with beautifully soldered PCB

Let down by the larger 'crapacitor' in the secondaries, a Capxon - others seem to be LTEC

[mockingbird]

Re: Enlight GPS-350CN-101

It's the same one like in this thread...

Interesting... So Enlight used Delta later on as an OEM. I wonder which case of theirs this came in (I'm not aware of Enlight selling PSUs without cases).

[Wester547]

Re: Enlight GPS-350CN-101

As usual, the one CapXon on the secondary is bulging and leaking electrolyte. Delta seem to spread around UCC, Nichicon, Rubycon, Ltec, Taicon, and CapXon as though they were all equal in quality...

[goodpsusearch]

Re: Enlight GPS-350CN-101

You should consider removing some of the glue, especially from the hot zones of the power supply.

Keep an eye on the B647 PNP transistor located under the 3.3V toroid coil. Mine was covered in glue and got toasty, tripping the psu protections every time it tried to switch on.

I notice that your unit as well comes without an extra daughterboard and passive PFC coil.

Please, can you post a photo of the fan label? The Delta GPS-350 I got for free had its own removed.

[pfrcom]

Re: Enlight GPS-350CN-101

I knew I should have tested it first, so I was working from a known position

Having replaced the offending Capxon with a Panasonic FC recycled from a defunct motherboard, it now won't power on

The Panasonic showed .00 on Dick Smith ESR meter, and ~2100uf on UT61E

I've forgotten the exact amount, but 5VSB measures well over 6V

What should I check now ?

Pic as requested, and pics of replacement

[pfrcom]

Re: Enlight GPS-350CN-101

I wonder which case of theirs this came in

Assuming Enlight cases are made from decent metal, I doubt it was an Enlight case from which this came

It was a flimsy generic case, pop-riveted together

[pfrcom]

Re: Enlight GPS-350CN-101

I looked at the plastic front cover of that "flimsy generic case" after my previous post

Should have done it before - because moulded inside it says "Enlight PM2402"

[goodpsusearch]

Re: Enlight GPS-350CN-101

I knew I should have tested it first, so I was working from a known position

Having replaced the offending Capxon with a Panasonic FC recycled from a defunct motherboard, it now won't power on

The Panasonic showed .00 on Dick Smith ESR meter, and ~2100uf on UT61E

I've forgotten the exact amount, but 5VSB measures well over 6V

What should I check now ?

Pic as requested, and pics of replacement

First, fix the 5vsb overshoot.

Look at the cap I have circled in the photo attached. This is the 5vsb critical cap. If it goes high esr the 5vsb can go too high and killl the motherboard. Please replace it with good cap and check the 5vsb again.

[ben7]

Re: Enlight GPS-350CN-101

First, fix the 5vsb overshoot.

Look at the cap I have circled in the photo attached. This is the 5vsb critical cap. If it goes high esr the 5vsb can go too high and killl the motherboard. Please replace it with good cap and check the 5vsb again.

I second this. 5VSB measuring in at 6V and up is bad! The first thing I thought when I saw the pics of the PSU guts was, oh no, it's got what looks like a 2 transistor 5VSB circuit

[mockingbird]

Re: Enlight GPS-350CN-101

I looked at the plastic front cover of that "flimsy generic case" after my previous post

Should have done it before - because moulded inside it says "Enlight PM2402"

Here it is:



Looks like their quality went downhill in their later years.

Measuring the steel on my 7237, it easily reaches 0.9mm where it's not folded over. But I'm under the impression that even later revisions of old models were built with much thinner steel as well. Mine is from the 90s.

[pfrcom]

Re: Enlight GPS-350CN-101

Please replace it with good cap and check the 5vsb again.

Thanks goodpsusearch

That Ltec 47uf 25v wouldn't measure on Dick Smith ESR meter, and showed ~28uf on UT61E

Only 47uf 25v cap I had on hand was a recycled Licon which did ~1.7 ESR and 47uf

Better than some new questionable brand 47uf 50v I also have, at ~1.6 and 40uf

So I used the Licon, and 5vsb is now ~5.2v - although if I hold DMM probes in place, it will drop by 0.01 decrements to ~5.1v

It still won't start though

What next ? - get some decent 47uf 25v caps and replace the lot ?

[goodpsusearch]

Re: Enlight GPS-350CN-101

Just replace every small cap in the primary. My unit has 2 x 4.7uF 50V Ltec and the critical cap you already replaced.

You should also check every cap and make sure it is in specs.

Did you check the TO-92 transistor under the 3.3V toroid? Mine was dead.

[pfrcom]

Re: Enlight GPS-350CN-101

I checked both 4.7uf 50v caps in the primary, plus another one the other side of the transformer

All seemed OK, around 0.14 ESR and 4.5uf

The transistor at Q301 also seems OK - testing with Continuity / Diode test of Fluke 77, gives a quick beep with one lead at centre leg and other lead to either side leg

I notice fan twitch when I switch power on

What should I try now ?

[goodpsusearch]

Re: Enlight GPS-350CN-101



Notice that base is not the center leg and that it's PNP, not NPN.

[stj]

Re: Enlight GPS-350CN-101

you should have just done a full recap with FR, FK & FC.

then taken it from here.
if all the electrolytics are good then start metering ceramics for a short.

[pfrcom]

Re: Enlight GPS-350CN-101

Notice that base is not the center leg and that it's PNP, not NPN.

If DMM shows Zero with Com (Black) to Base and Ohm (Red) to both Emitter & Collector, does this mean transistor is faulty ?

[stj]

Re: Enlight GPS-350CN-101

maybe, or something connected to it.
are you talking about on-board testing, or off-board?

[pfrcom]

Re: Enlight GPS-350CN-101

Sorry, should have been clearer

Transistors desoldered from boards, and using method 3 from:
http://www.wikihow.com/Test-a-Transistor

I get ~55 Mohm with Ohm (Red) on Base, but nothing if Com (Black) is on Base

Plural after acquiring another two of these discarded for rubbish collection

[pfrcom]

Re: Enlight GPS-350CN-101

Did you check the TO-92 transistor under the 3.3V toroid?

If DMM shows Zero with Com (Black) to Base and Ohm (Red) to both Emitter & Collector, does this mean transistor is faulty ?

Anyone ?

[goodpsusearch]

Re: Enlight GPS-350CN-101

diode mode, not ohms