Replacement Laptop Power Supplies: Is This One Good or Bad?

[jazzie366]

Hey guys, this year I'm doing my own eBay store so I've contacted a lot of manufacturers of various products.

I found this one and they make some really decent shit and have a good reputation. They make a very simple replacement power supplies that will be fine for most applications. The two pictures below are of a 24v, 2.5A power supply. I tested it by putting it under 3A of load, voltage drop wasn't too bad, and it didn't even get that warm. Under rated load it performed beautifully with 0 hiccups whatsoever and perfect voltage.

The caps used are KYS branded and LScon branded. I've not seen LScon before, I've seen KYS in a LOT of logitech products, never had a problem with them so I'm okay with that. The LScons I've never seen, but they seem to do okay? They both test perfectly (there are two, one is 100uF 400V, the other 50V 10uF) Who knows, time will tell.

Main mosfet is a MagnaChip MDF7N60B 600V 7A rated, I'm definitely okay with that. Rectifier is a KBP206, 1000V 2A. for something that's not even gonna draw an amp, I'm impressed so far as to how overkill a lot of these parts are. The output rectifier is a Diodes Incorporated MBR20100C, it's a schottky rectifier rated 100V peak/working, 10A. I'm impressed with this little shit. For being rated so low, it's got a lot more beef in it than is necessary. I know my 4A 24v power supply has a 100uF primary and the same amount of output filtering.

As far a as safety goes, this thing packs a massive isolation isolation gap, and loads of white glue which was very hard to remove over all of the components. Capacitors, wires, and the PCB and transformer were all glued to the case. This thing was definitely made with quality in mind.

This does pass CE, RoHS, and FCC certifications, as do all of their products. The lack of input filtering sucks, but that's only because this is meant for being a basic power supply, not for a laptop. The laptop ones have filtering if I am not mistaken. Also for those complaining about the lack of output filtering, there is a coil in the cable itself, oldschool style, no inductors on the PCB.

Forgot to mention, there is shielding on the inside of the case it came in, that's how it passes FCC standards.

Also, the damage to the PCB was done by me and a chisel trying to get this infernal thing open. It took so long to open it, I was impressed by the case thickness.

Now, the real kicker is the price of these things, 2.47$ USD each. Price gets lower with higher quantities. After shipping it'll be a little bit more, but it's worth it. I should be able to sell these for around 7-10$ usd, and know they're not going to fucking kill someone from a shitty solder joint or faulty transformer.

If there is anything I am missing, or am not noticing, please inform me. I want to sell decent products, not the best out there. Just want to try and launch this business off the ground and see what happens.

[budm]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

What do they use to isolate the two legs of the main filter cap from touching the heatsink?
What are the printing on the casing? Pictures of the case?

[jazzie366]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

What do they use to isolate the two legs of the main filter cap from touching the heatsink?
What are the printing on the casing? Pictures of the case?

Shit tons of glue on the PCB are what holds the pins back from touching the heatsink. While there's no physical barrier other than air, there's glue going the entire length of the cap holding it to the PCB. I had to use a screwdriver to pry it up.

Case pics:



No dodgy English on the label either, unlike most of the Chinese junk.

[Behemot]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

Another chinese crap with third of the components missing…

While there may be a company which can make decent PSUs with good components and stuff, findind is like with the needle in a haystack. Plus I think will all the proper certifications, import costs etc. it wil be close to the price of quality ones. On top of that I expect you do not have the equipment and knowledge to test this thing. So better go to some US manufacturer and distributor (basically any larger reputable company) for quality PSUs.

Tried the same, ended with this decision, and I can tell the quality and performance unlike you (no offense). It will be more expensive, but pretty much effortless and you can rely on gome-based company for RMA etc. How do you expect to process RMA with these things? I know most of those chinese idiots only want immediate profits, that's their mentality, they can not plan for future, they want everything RIGHT NOW. When a problem comes, you are often screwed, especially with these cheap craps.

[budm]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

No manufacturer name? Model CP065U? Lots of power supply with the same model but different Voltages.
http://www.ebay.ie/itm/Toshiba-Satel...U/151893367601
FCC logo but no FCC ID number.
Fake labels.

[Per Hansson]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

It might be good for target practice, other than that I don't know!

[Behemot]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

No manufacturer name? Model CP065U? Lots of power supply with the same model but different Voltages.
http://www.ebay.ie/itm/Toshiba-Satel...U/151893367601
FCC logo but no FCC ID number.
Fake labels.

Well what would you expect for that price. Quality unit won't be under 10 even in high quantity. And even that's great price man, I've checked end prices for Meanwell which is decent but still chinese company and I almost passed out

[sam_sam_sam]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

At one time wasn't Meanwell power supply's a good quality or am I wrong about this

[jazzie366]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

Another chinese crap with third of the components missing…

While there may be a company which can make decent PSUs with good components and stuff, findind is like with the needle in a haystack. Plus I think will all the proper certifications, import costs etc. it wil be close to the price of quality ones. On top of that I expect you do not have the equipment and knowledge to test this thing. So better go to some US manufacturer and distributor (basically any larger reputable company) for quality PSUs.

Tried the same, ended with this decision, and I can tell the quality and performance unlike you (no offense). It will be more expensive, but pretty much effortless and you can rely on gome-based company for RMA etc. How do you expect to process RMA with these things? I know most of those chinese idiots only want immediate profits, that's their mentality, they can not plan for future, they want everything RIGHT NOW. When a problem comes, you are often screwed, especially with these cheap craps.

None taken.

There are manufacturers that do make much, much better power supplies. But you're right, they do cost a lot more.

Believe it or not, the manufacturer sends these out with a 1 year warranty on them, being one of the better rated manufacturers in China, I thought I'd give them a shot.

At one time wasn't Meanwell power supply's a good quality or am I wrong about this

Meanwell is still good, but nobody wants to purchase their power supplies due to the increased cost. Snap-On tools uses Meanwell power supplies in their training and calibration equipment for torque wrenches and trainer circuits.

The only reason I wanted to try these guys is because most of the chinese shit I get on eBay has minimal separation, and they use Tocon capacitors. Not to mention most of the filtering is underrated for the PSU.

What got me interested in this was a professor at my university came to me one day saying his son's PC wouldn't turn on. Had a 7$ eBay replacement adapter with it. I tore the thing open and it hadn't lasted a day before the caps burst. It had 560uF caps on the output, which is kinda small. Input wasn't much better at a tiny 47uF 400V cap. I just wanted to compete with those assholes who sell that shit and put something that might last a few years at best instead of it being a hit or miss.

In then end, I'm trying to sell better power supplies and other various things that won't kill someone or destroy a computer, they'll do their job for a limited amount of time and then be done.

[Behemot]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

If you can make them make it better for say 5 bucks, you can still compete with at least half-decent stuff for reasonable price, for non-heavy use, compared to really expensive HW. But now, in the curent state, it is still crap, there does not even seem to be the secondary TL431, or is it elsewhere? I can only see vacant spot. Does it even regulate voltage properly? And where's the input filtering?

BTW how can you be sure the transformer insulation is any good, I think good transformer for 60 W costs close to 2 bucks itself, here you have the whole thing for 2 bucks…

With quality things, you just don't compete with crap. You can, from time to time, explain ppl why that crap is bad, but usually it's better to shoot your own leg than talk with these ppl. Those are just not customers for you.

Those who have half a brain and usually already had some accident with those El Cheapo wonders and learned from it can value quality. Those are your customers.

[cpt.charlie]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

Just a chinese PSU, at least the pcb seems to be clean, but long term reability and security cannot be waranteed, BTW the CE symbol is likely fake, a classic chinese trick, that symbol means "china export".

Most problems with this kind of replacements are related to low quallity cable/connector and failures at the primary stage (shorted mosfet or dead IC)

[Behemot]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

In these simple units most often caps go bad, including the primary one. Only than things start exploding

[cpt.charlie]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

In most chinese laptop PSUs i have opened just a few had damaged caps, most seem to blow the primary mosfet (but the most common issue by far is related to a poor quality dc connector)

BTW, i have received the caps, everything OK, now i'm waiting to use them.

[Behemot]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

Ah, I have mostly experience with 12V or similar bricks for displays.

[cpt.charlie]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

I used to work in a computer shop and i have thown to recycle a couple 100's of this kind of cheap psus, i still have a few lying arround.
The good thing about these PSUs is that you can easilly modify the output voltage with a potentiometer instead using the fixed value resistors of the TL431, very handy PSUs for non criticar/demanding tasks like my li-po battery charger, at long term capacitors tend to fail due to low quallity and very high operational temperatures (terrible eficcency) i remember of a guy that made a test of these PSUs and despite the unit was able to deliver it's rated power, after some time the interior reached >100ºC ooops no overheating protection and risk of fire!

[jazzie366]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

I used to work in a computer shop and i have thown to recycle a couple 100's of this kind of cheap psus, i still have a few lying arround.
The good thing about these PSUs is that you can easilly modify the output voltage with a potentiometer instead using the fixed value resistors of the TL431, very handy PSUs for non criticar/demanding tasks like my li-po battery charger, at long term capacitors tend to fail due to low quallity and very high operational temperatures (terrible eficcency) i remember of a guy that made a test of these PSUs and despite the unit was able to deliver it's rated power, after some time the interior reached >100ºC ooops no overheating protection and risk of fire!

Had an experience with one of these before. Friend I know through the automotive industry came to me one day to repair his PC. It came with one of those shit chargers and it weighed less than a pound, probably 8oz at best. I opened it up and found a transformer no bigger than double a 2A usb charger transformer.

The complaint was the unit wouldn't charge sometimes and it had a broken screen. Gave him a new charger and put in a new screen and sent him on his way.

Also, if you didn't see what I wrote before, I did say I had tested it under a 3A load, voltage drop was obviously out of tolerance but that was because it was overloaded. Under rated load this thing never got hotter than most normal adapters do. I think this is probably because of the internal components being rated for higher loads than what it's seeing.

As for voltage controlling, it uses an OB2269C chip, datasheet here: http://www.datasheet4u.com/pdf/OB226...19109#download

Now, for this power supply I'm going to deny the manufacturer's offer for these and find someone else and request another sample that might be better.

If I find one that looks more decent, I'll ask you guys.

Thanks for the input everyone.

[jazzie366]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

Alrighty, an update to this PSU situation:

I contacted another manufacturer, and I requested a sample. The supplies cost much, much more than the others. They have the proper paperwork for their products showing that they actually conform to CE standards and RoHS. They also meet ISO9001:2008 standards. Hopefully they will be of higher quality. They cost 9$ each instead, so I'm hoping they're built better.

We will see in time though, I should have the sample some time next week.

[Behemot]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

That's just PWM controller, there should be something for feedback. Though if it's some flyback I guess it can be done through optocoupler only. But usually it's combined with TL431 or something similar.

I can cooperate with you on that as I'd also like to get reasonably good units. Just don't have the time and nerves to talk hours with those operators who no nothing anyway. Though it would have to be 100-250V to satisfy our line voltage

[cpt.charlie]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

Consider a look at ac-bell they won't be the cheapest but the units i've opened looked quite decent.

[jazzie366]

Re: Replacement Laptop Power Supplies: Is This One Good or Bad?

That's just PWM controller, there should be something for feedback. Though if it's some flyback I guess it can be done through optocoupler only. But usually it's combined with TL431 or something similar.

I can cooperate with you on that as I'd also like to get reasonably good units. Just don't have the time and nerves to talk hours with those operators who no nothing anyway. Though it would have to be 100-250V to satisfy our line voltage

I don't accept the charger unless it's rated for worldwide, which is what the new one is just as the old one was as well.

I'm good with talking to overseas manufacturers, I know what they want to hear and how to get an invoice and sample within a few messages.