Needing a power supply to test some older Socket A boards, I dug out and gave this a clean
Was it worth the effort ?
Was it worth the effort ?
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better to keep quiet and be thought a fool, than to open your mouth and remove all doubt -
Re: Is this oldie a goodie ? - Macron MPT-A230W
Not really something I would use...
Doesn't look that bad from a far, but still in the 'avoid' range... -
Re: Is this oldie a goodie ? - Macron MPT-A230W
Wow, that's an ancient Macron!
Single-transistor 5VSB without feedback and likely 7805 output regulator for the 5VSB. If the 5VSB section doesn't look too burned/charred/darkened from heat, it should be okay to use. Unlike its 2-transistor cousin, the single-transistor 5VSB with 7805 output regulator usually only kills itself if something goes wrong and not the motherboard.
I should note that this is not the best build quality I've seen from Macron though - in fact this looks a bit gutless. If you do have some spare caps, though, this might make a decent PSU since there is space on the secondary side for 12.5 mm caps (something you don't see very often in PSUs).
As for whether you can use it for testing - that denpends on the output rectifiers and the particular socket A motherboard you are testing. Older socket A boards pull more power from the 5V rail while newer ones with the 4-pin 12V CPU connector pull more power from 12V rail. With that in mind, if testing a 5V-based system, then make sure the output rectifer for the 5V rail is rated for at least 16A. Likewise, if testing a 12V-based system, then make sure the output rectifier for the 12V rail is rated for at least 10A.
Also, I highly suggest using either onboard video card or some low-end, low-power GPU if using this PSU to test. Avoid high power graphics cards or anything with a separate power connector.
Last but not least, if this power supply hasn't been powered in the last 5 years, I suggest to first plug it in the wall and let it sit for something like 30 minutes. If everything is still good after that, then try hooking up either a junk hard drive or a bunch of fans and turn it on (by jumpering PS to ground). If the PSU doesn't make any weird screeching or whining noises, it should be okay to use.Last edited by momaka; 08-06-2014, 08:57 AM.Comment
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Re: Is this oldie a goodie ? - Macron MPT-A230W
Doesn't look too bad for 230W depending on the secondary rectifiers. They're all TO-220 though so it's unlikely that any of them are rated more than 20A, and not even the 5V has two in parallel, usually these old ones do.. Do the matching transistors on the primary heatsink say 13007 on them?
You may want to consider larger input capacitors, and some Y capacitors, and I'm sure almost 100% of the caps are out of spec. Even the large ones that aren't bulging probably read very high capacitance
Going by the first picture, what is that cap directly adjacent to the main toroid coil? It looks like it has a Rubycon vent (It's probably fake)
Is that a Power Logic fan?Comment
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Re: Is this oldie a goodie ? - Macron MPT-A230W
200 Watts, top, on a good day IMO.Comment
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Re: Is this oldie a goodie ? - Macron MPT-A230W
Don't bother with that!Comment
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So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.
In the process of poking around, I also lost a zener diode that stabilize the voltage coming from... -
Hi,
Finally replaced all of the shorted 4148's and resistors and an blown tl431 on my FSP300-60GTF after 5VSB going crazy and destroying it self. Those components also made the secondary transistors appear shorted (while in reality they weren't).
Powered it on through my dim bulb tester and they (bulbs) only flash once meaning primary caps are getting charged, but that's it. No 5VSB, PS_ON voltages.
I am sure I have replaced the components correctly and that there weren't any shorted/blown traces left.
Any ideas where to go next? -
This one should make @Pentium4 smile
(if he is still reading BCN forums) – I got a new old stock / open box Casing Power MPT-301 PSU on eBay for $4 total. 
Yes, it’s a very generic-looking box, but the manufacturer isn’t (at least not back in the days), which is…
Macron Power Technology Co. LTD.
Let’s look at the PSU itself.
The shell/case also appears quite generic, like many “sold-with-the-PC-case” units. However, the shell is well-formed and has decent steel thickness. In terms of... -
Hello...
I got my self a dead CM V700 PSU, with nothing on +5vsb
I have tried to fix it for the past 2 week, and I'm stuck... so i guess i post it here to get some pointer before i scrap it..
As you can see in photo, the psu still pretty clean, no visible damage or bulging cap.. when i got it, it still has CM seal on it
The +5vsb system use ICE2QR4765, I have trace and measure the voltage on ICE2QR4765 and the only voltage reading i got is in VCC 4.8v, Drain 310v and FB 3v.
I have read the datasheet and and still can not... -
Rescued this one
Started it up in the computer case, and noticed that it would shut down after about 10s in the BIOS
Took it out, connected to hard drive and it loses all power on all rails (except for 5VSB) after about 40s or so. (the same result happens without a hard drive connected)
The 5VSB drops to 2.5V when it 'shuts down'
And the voltage across the primary cap falls from 335V to 330V at the same moment
I think that the 5VSB is regulated by an A6069H PWM chip (which was initially dropping to 2.5V even before the the PS-ON was grounded - but it now stays at...
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