Meanwell Switching power supplies intermittent every capacitor under 100uf

[sam_sam_sam]

Here is the eBay website link where I bought them from

https://www.ebay.com/itm/276135936202

I have been waiting for these switching power supplies to come well they came in today so I took one apart and found that it Capcon and EIite and another brand that is on my list of capacitors to replace on site it has several 0.47uf @ 50 volts ESR value twice the reading of a new one 10 UF @ 50 volts almost twice the ESR value of a new one 47 UF @ 59 volts with double the ESR value 100 UF almost the same as a new one it got replaced for good measure Iit was a brand if I see them I replace them

After running if for about 45 to 60 minutes the cooling fan became very noisy it has to be replaced with a quieter fan in the lot of the ones that I have

I bought a lot of 17 plus shipping for about $90.00 ( another words about $5.30 each not bad considering the cost of a new one plus the shipping cost )

I have taken a few apart and just about everyone of them needs to be carefully cleaned and recapped and find some used cooling fans because I found one that was very rough when turning it and one of them is very noisy after it has been running for a while

I have some 3.3 volt LED panels that I going to use one of them to power it off of and I going to use one to charge some high current battery packs that I am going to build

I do not know if I can repair all of them yet or not if it is not repairable then I will use it for parts it has some nice heat sinks on them some other parts as well

[CapLeaker]

I've been using Meanwell PSUs for years with good luck. I use these as Nortel power supply replacements in telephone systems. The ones I use are bricks not this type you are using, but overall this manufacturer seems to be decent.

[sam_sam_sam]

Yes they do seem to be well built except for the brands of capacitors that were used in them
I thought about using one for a 4.2 volt battery charger but I have to figure out how to get the fan to change speed depending on the temperature of the enclosure but that is another project that I will post this one when I get to that point I have to see what voltage these fans run at and maybe put temperature fan speed controller in it as well

More on that later when I get to this point it might be a few weeks before I might have time to work on them

[CapLeaker]

why do you need a fan speed control? For noise?

[sam_sam_sam]

why do you need a fan speed control? For noise?

Yes because at 7 watts maybe a little bit more than that the fan speed is fairly high and noisy the enclosure is barely warm so I think the fan speed could be lower and not so noisy

[CapLeaker]

Put a noctua fan in it and all is good.

[sam_sam_sam]

Put a noctua fan in it and all is good.

Thanks for the information I have to measure the fan size and order a couple of them and try them

The ones I use are bricks not this type you are using, but overall this manufacturer seems to be decent.

Can you post a website link to the type that you use for your application

On a slightly different topic but related to these switching power supplies in general the size of this switching transformer is a lot bigger than I am used to seeing is it possible to rewind it to a switching power supply that the transformer core is way too small for the amount of current that is being pushed through it this question is for information purposes only at this point of time

Because I have a couple battery tool chargers that the switching transformer is over heating to the point that it to me is unsafe to use it the way it is designed for my application of just putting the battery on charge and walking away from the charger and not worrying about it catching on fire

I tried to run these on a separate switching power supply but the issue with doing this the charger monitoring system circuit is very picky about the voltage level is and errors out so this is not an option for the way this charger is designed the other issue is that the BMS circuitry is part of the charging circuit not like most other tool battery chargers are designed

On this particular topic about this battery chargers I did find a double slot battery charger for these batteries and the enclosure is some what bigger and has two USB charging ports on it and has enough room for two 30mm cooling fans which helps a lot and the electrical components are more spaced out and a slightly better design but knowing how this manufacturer design these battery charger I knew that I was going to have to put cooling fans I just used 7 volt cooling fans and run them off of the USB charging ports for the power and these cooling fans came with a power cord connector that I use to turn on the fans when I am charging the battery packs and the results are very except able for my application and the way I want to use it ( I might put a couple switches for turning ON and OFF the fans if I can find the right switches for this enclosure )

​

[stj]

al the screws are missing - what fucker loses the screws?

[sam_sam_sam]

al the screws are missing - what fucker loses the screws?

I thought the same exact thing as well so you are not alone

No they are not all missing they were in a baggie in the box that they were shipped in but because this box was so heavy the box was ripping apart when I received it yesterday but the switching power supply were individually wrapped and had padding in it as well so the seller did a good job of packing it

[CapLeaker]

Thanks for the information I have to measure the fan size and order a couple of them and try them



Can you post a website link to the type that you use for your application

On a slightly different topic but related to these switching power supplies in general the size of this switching transformer is a lot bigger than I am used to seeing is it possible to rewind it to a switching power supply that the transformer core is way too small for the amount of current that is being pushed through it this question is for information purposes only at this point of time

Because I have a couple battery tool chargers that the switching transformer is over heating to the point that it to me is unsafe to use it the way it is designed for my application of just putting the battery on charge and walking away from the charger and not worrying about it catching on fire

I tried to run these on a separate switching power supply but the issue with doing this the charger monitoring system circuit is very picky about the voltage level is and errors out so this is not an option for the way this charger is designed the other issue is that the BMS circuitry is part of the charging circuit not like most other tool battery chargers are designed

On this particular topic about this battery chargers I did find a double slot battery charger for these batteries and the enclosure is some what bigger and has two USB charging ports on it and has enough room for two 30mm cooling fans which helps a lot and the electrical components are more spaced out and a slightly better design but knowing how this manufacturer design these battery charger I knew that I was going to have to put cooling fans I just used 7 volt cooling fans and run them off of the USB charging ports for the power and these cooling fans came with a power cord connector that I use to turn on the fans when I am charging the battery packs and the results are very except able for my application and the way I want to use it ( I might put a couple switches for turning ON and OFF the fans if I can find the right switches for this enclosure )

​

I am using these Mean Well GST and SGA series. I'm using these to replace failing Nortel bricks.
https://www.digikey.ca/en/products/f...BygCYD3PIuzRkA

[sam_sam_sam]

Well I managed to repair a second one and this one the 0.47uf capacitor was 10 times the ESR reading compared to a new one and I also found that several cooling fans do not work either one of them that I started to repair one of the ceramic capacitors had just crumpled apart I just set that one aside for the time being

[sam_sam_sam]

Put a noctua fan in it and all is good.

I can not find a noctua fan that is 60mmx60mmx25mm with a 2 pin power connector
I can find plenty of 4 pin ones and 3 pins but not as many but can find them do they even have a 2 pin fan

[CapLeaker]

I can not find a noctua fan that is 60mmx60mmx25mm with a 2 pin power connector
I can find plenty of 4 pin ones and 3 pins but not as many but can find them do they even have a 2 pin fan

Just take a 3 pin fan and don’t hook up the yellow wire. Done.

[sam_sam_sam]

Just take a 3 pin fan and don’t hook up the yellow wire. Done.

I thought about doing that but I would have to change the connector and use the yellow wire for the indicator light that the fan was running

Thanks for the suggestion and information

[stj]

?
if the old fan was 2 wire you only need 2 wires - is the original fan soldered or on a 2.54mm connector?

[sam_sam_sam]

Pin connector but I going to use the original connector and just use the yellow wire for a light indicator that the fan is spinning

[stj]

the yellow wire has almost no current capability - you would need to add a chip.

[CapLeaker]

Never tried to take the yellow wire as like an indicator light to drive an LED. Stj is right, the yellow wire has almost no current capability, but exact how much? I don’t know.

[stj]

data - most fans use simlar chips
look at page 8 - 4mA max

[sam_sam_sam]

data - most fans use simlar chips
look at page 8 - 4mA max

If I remember correctly I think I have done this with a low current LED light bulb but I will try it again on a few fans that I have that are three wires and post the results thanks for posting the data sheet for this fan because I have several of this brand

Because I could not remember how you were supposed to hook it up I remember that you had to use a resistor to limit the current but I could not remember if you had to use the positive rail where you put the resistor then the LED light bulb to the yellow wire

The first switching power supply was ran for three nights that was also partially recapped as well and had no issues either and as far as I am concerned it has been repaired as well

An update on the second switching power supply that was partially recapped it was ran for three nights in a row with no issues so as far as I am concerned it has been repaired

So if I can repair several more of these switching power supply I have gotten my money worth for what I paid for all 17 of them hopefully I can repair most of them with out spending any money on parts other than the capacitors that I already have in my parts ben

I have come to realize that most of the cooling fans in these switching power supply are pretty much history because apparently these switching power supply were used outside in LED signs and were in a harsh environment some of the circuit boards show some signs of dust and dirt residue but look pretty good once cleaned

Because I have so far found several cooling fans that either do not work at all or are very noisy and all of them very dirty so I will probably need to replace the fans in ones that I plan on using on a regular basis so the cost of each switching power supply is probably going to be more $5.50 each but it still will not be as much as o new would be