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Old 11-05-2019, 04:23 PM   #1
starengose
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Default Problem with TX650 Corsair Power Supply

Dear All,

Sorry for my english.
I need some help concerning this power supply. It doesn't works anymore, any output voltage.
I put some pictures of power supply I trying to test it most of capacitors tested are ok. It's difficult to test small cms capacitors sometimes my multimeter doesn't display something. I've tested also with power on but impossible to get logical values for example I have alternative voltage in parts of continue voltage.
I've tested most of component I changed a opto-coupler but I don't think it was damaged. As you can see in picture 225300 when I open cover I found burn part (metalic ring) between two tracks. I removed it but you can see burn marks.
If someone can help or can get a shematic because it's difficult to me to fix board with alternative voltage because I don't have oscilloscope.
I have also a problem with cms diode I don't know the sense.

Thanks for your help.
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File Type: jpg IMG_20191105_225300.jpg (729.6 KB, 17 views)
File Type: jpg diode missing.jpg (123.0 KB, 18 views)
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Old 11-05-2019, 05:39 PM   #2
RJARRRPCGP
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Default Re: Problem with TX650 Corsair Power Supply

Code:
RJARRRPCGP system error: One or more photos unreadable. (blurring)
Well, one of the photos appear to be improperly focused.
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Old 11-06-2019, 12:50 PM   #3
starengose
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Default Re: Problem with TX650 Corsair Power Supply

Dear Rjarrrpcgp, sorry I am not expert to take picture properly.
Here you are thanks.
Attached Images
File Type: jpg IMG_20191106_194445.jpg (584.8 KB, 17 views)
File Type: jpg IMG_20191106_194125.jpg (664.5 KB, 19 views)
File Type: jpg IMG_20191106_193239.jpg (791.9 KB, 25 views)

Last edited by starengose; 11-06-2019 at 01:14 PM..
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Old 11-06-2019, 05:16 PM   #4
xmetal
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Default Re: Problem with TX650 Corsair Power Supply

Those green electrolytic capacitors in the last photo look like they are bulging and will likely need replacing. Do you have an ESR tester for checking the caps?

Last edited by xmetal; 11-06-2019 at 05:19 PM..
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Old 11-07-2019, 12:08 AM   #5
RJARRRPCGP
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Default Re: Problem with TX650 Corsair Power Supply

Doesn't look like actual bulging. (no bulge at the vent seams)
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Old 11-07-2019, 01:07 AM   #6
starengose
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Default Re: Problem with TX650 Corsair Power Supply

Thanks for your replies, I confirm that most of caps are ok I've disoldering most of them (big one not cms) and values are ok. Now I am suspected UP3861P and components around it (small board outside main board in picture). but I need way to test it only with multimeter.
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Old 11-07-2019, 08:29 AM   #7
sam_sam_sam
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Default Re: Problem with TX650 Corsair Power Supply

This just me but when I find any type switching power regulator I suspect that might be problem I replace it if the part is easy to get
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Old 11-08-2019, 12:52 AM   #8
starengose
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Default Re: Problem with TX650 Corsair Power Supply

Dear All, I fixed PSU, I've only refresh solders on small board (caps) but about diode I put in same sense than other in board (cathode to ground) but with multimeter in one sense I've got 0.5V and other sense I've got 2.8V thereas normally I have to get only 0.5V in one sense and other infinite. I'll test it with motherboard and graphic card to know his durability.
Thanks for your help.
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