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Please be aware of how long your PSU mounting screws are!!


jonnyguru
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  • Corsair Employees

At Corsair, we've seen a number of "dead" PSUs returned to us that have been mounted to the chassis using screws that are much longer than what's included with the PSU. This has either caused damage to internal components of the PSU or a short against the heatsink inside the PSU.

 

We're still investigating which recent chassis are shipping with unusually long screws, including Corsair's own product. In the meantime, we ask that only the screws included with the PSU are used, or, use special attention to make sure the non-Corsair PSU mounting screws you plan to use are not longer than the screws that come with your PSU.

 

Attached are some pictures of PSUs damaged by longer mounting screws.

 

attachment.php?attachmentid=29780&d=1496899432

attachment.php?attachmentid=29781&d=1496899437

attachment.php?attachmentid=29782&d=1496899440

406869135_DSC_0612_RMA20161005(W43)s.thumb.jpg.af53b2d0cf96742afcd4cd2cb402613d.jpg

1931276955_DSC_0664_RMA20161201(W48)s.thumb.jpg.51359c8e93e425855654d9a13bca0b8e.jpg

760845189_DSC_1069_RMA20170502(W19)s.thumb.jpg.987f9cf7300ed9a591e9bf03f9e340f1.jpg

Edited by jonnyguru
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  • 3 months later...

6-32-flathead.jpg

 

I suggest 6-32 3/16" flathead is the best choice for a desktop machine generally. These are low cost on ebay in lots of 50 or 100 for a few dollars.

 

I use them widely as they fit all PSU properly and also also desktop hard disks. DVD drives use the M3 type screws which are a smaller size.

 

the cheapest screws are philips head and they are common with chassis construction screws

 

be more careful as the 3/16" are 5mm, some are 6mm which are longer, use the shorter screws

Edited by Vegan
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  • 1 month later...
  • Corsair Employees
maybe this is the reason why my case used to feel under electrical tension with my hx650 that got installed with included corsair screws no less...

 

No. That would be an incorrect assumption.

 

That's either because:

 

* You have a short somewhere

* Your AC outlet isn't actually grounded

* Your hot and neutral are reversed

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  • 1 year later...
  • Corsair Employees
After looking over my AX760i that just recently failed i would say some of the screws you are shipping with the PSUs are already too long and i have picture for proof if any one wants them.

 

Ok. Show us the pictures.

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I would have posted these last night i just didn't want to upset anyone for filling this topic with pictures.

 

When i first installed this PSU One screw seemed to not tighten all the way down but i didn't force it cause i didn't want to strip the threads, i thought maybe the hole hadn't been tapped fully. Had no idea that it was touching the circuit board. it ran like this for a more than 5 years.

 

A week ago i started having issues, it started randomly shutting down till it wouldn't power up anymore. I unplugged all modular cables and tried to use the test button no lights and no fan spin up, i then pulled the unit out and tried to test it outside the case. this time i got a green light for a few seconds then it went out same for the fan, i was still holding the test button when the light and fan would turn back off. I reinstalled the unit and tried the testing again. I noticed it wouldn't give the green light if i had the screws in.

 

Even though it was giving me the Green led for a few seconds i still could not get the unit to post the system,I even tried the paper clip test.

 

I looked closely at all the screw holes and noticed that the screw i was having issues with not tightening down was chafing the circuit board.

 

2AogXZ_bHbpnB3CLrXyrzovUGddLcn5TFKCQKRqC6lxMJxECgoBwzu13lI8ayV8O2KivofzVIQ_sk7OHGhwALXxyfGY2SP8SKYWxB6DSfJNrNbC_8IqJvPbu4usSrQQBnbrTJlvuFL1HwcmJPfPCp4rYMXbQGNiR0CIcUGagBHhuk0r6UXNacK0gqZJn38MGv4Biil_TvM-Ez8jZW4Kr-Y6My1xDZiR3HKkrANWmmgwrX3Spi-n8p4pUfQzaqvRcATlro9IO-Yho7wUK62jUnVBWolJMErELQr4iaE-LVuE_QIIyEeY7yv8fSCgf5APvCyR3n_kEiFWcG0iNus19RazEHMBTZi04ZMoPFJh-_fj3vFbBQaBwbWxb_OAJFR2diUtRdUchrj446wavrYFRZctK1Yx20HgpfJ0vXPaiP2TjWBJSi9n-dyA3q98-JBMApX47j2TTwo4Jw8bc9nRSUQRVgk7dQ14Tmt1LU75UAd1Wh0u8PLfnvICCaoGdJLGaTCHvkxDH7gK7v89tWsAGNezsPN5t91EVxruQLj8UD4yRtdkxBHoFPbtEV7bIQhjrDR7xKF3SF7q62eb0vub_QKc9vhPTYYukrp88fyw4qQgTh5W7KjCqP0ZgVDS3NnzPZ6-14ccGwuNuaRgzpZcRtzef=w673-h897-no

 

I checked the depth of the screw hole with a cut toothpick

 

LcAjsLB_0CoGOqtKP34EPZFNPkJVpv0KAGngUo4vAyQ8vWkdZGARU3v2njJFZvaub0UzzcLyhUDtANbnNIBkaHf7MEElb90_M-Ko-2Hb30X6TzB0lWKgOpGV_WQSPyfR5XtOG_DN-VhgTYPV2IfooGSKN1bhvO5RUMLj3j0tTC3DBCIweXytRtNOsktEXsYMRAisBshcbszmk2_TzkQpdYdJAV6zW0otua1CCgMwrshPxBdU49jq8VXusbmc4hcpXsQsOtsvO_77XhuOX5eBhCX8q1Yh9oODddg99hcuFfmPIbN_L8qUnkariwMDviPfJlKGuiD4WwBR2NGS120Rfpkn8qbTD9m1vef-_kuHLNTs8haYEQJ0UwdaYZTdwjApKT-XYG2eqi7vEO6xO1e_dq4vMDcLiY-Bqe_4R22PGOebMb8KTisrHg6z2WDiiq1FmgBeYDOffQ1QwE9IFRhtjITXDQ_o46XZIIux7tk97VtWqKooeBCYu0VPJ5HLFJHrieVE9MjbaKDE2-qBoFr1cGaNxfbU1yBg33krsSkC7wefGcM3D1LDi4_4ute3S_Lwo-Hem6ayFKdeMOWPoQEgBldchNH_4J6MmiWYjvbLFkIx5QvD6UOXPyGRzaphVvPV9rkE7XiPGb819MGqdMyxoRtIAiWkF_qihff5x6pJ0QryIfEeYVusicJbGFVXc_bpQCs2vU-ffFfXLlI2BA=w1196-h897-no

 

I then marked the toothpick with a sharp black pen.

 

iGTFTZnq6fyN0ugHhek95vP0v0ykjBrqMCAmECDDSysuuXGkk-qfa9uMTz9DcbWksprSj_JeLihjhqZeTe0tp98WJ99tx2ESfOEZzYK7CoKU6KpQad6y7UqvamEXV5cPyroUJTwgVESCykKcHFOMZa52RRIAobY-gJDUVNOiKyBsMPMM1B8bfoX2DPIi0jJJpIKzAurT-nAcfa5-ntRggPpmpABUCjy0iKo54p7yyujJTFLbmd04vfFIy8HIQmTSdvLIcLtQH2LdMKtIOYCstCYHSwlwOkt94TjfzFpi2ZgsA_A1fOORrjTSqA-BLW8y-nXgBbypMs9tHg5wvLpbeX2hQFq6wd0NA0r9HBDQcG4jww7gmT3e8uX5A9jUMeHd0KQhyF6Zy7NTJPpZEC2chzcNCf7OS9dL2VyX4r6IZyh26A8mNiCUG5Bma0_j4jihtYdtkPGUMtE7xjRLTLNjTMHE9PjjknL8cuJtYAs5iOCmh8QKzHEKbVVDtLwA365BKH-DNkfLzrfX3Jg_9gTJSEpmOUmgutQAxvIygr_e0c4WlkoD5fN3HL7LFL_frkzZmBzL91U01G08LiiITKivJUuTV8vElEfJgU053f5U0ZylQRirxYJQas6ivcYaSwgiMp7ybt3KSaiy8RDRskgaMYdXZXIuMygdmYIRUFDAh_6BAdOYbWey7qqfuik5YQhO3oT-xQsc3KRSwMcPXg=w1196-h897-no

 

I compared the screw to the depth gauge toothpick.

 

sCsCDjQt65a7IdL0l0dOUyuCMgy1QQYK1faA4pa2u9feGNyT2XpsQWHdKEXs2ye00n4vGpUKNxi_HfJn1EysZLOPphDsoVT1avVJf9AzlDgp-LNSCnSBC1jjKxYkBaj7VEoA4r44U6-czioP5kbBQz5WdEzO3DZWjYGlCEQTBWjRbp59fzjpV_p75lNiSGWyeW-z5YDtRax6zlozYmFiW5ic842hV5nw-rWtJFXp47nGxJHvdlR8iTWUagwLKGlJFzFvluTXVcoEaofm-mIBbrUA24_o9Ol5BgblPZZN8dIACKi_3_ct-ensRhv2ywEK_B0OlctdBGQEXHkybTPxpky-ZpKGgr3aahXB3jNFPiRwuMhy0tCLeBDAZ__5kbLdWkAovsrudsbtxU4NE0AjmX6y0LMAuhY0_noq_G2-0uvuHg_tZWHrwEuVlPCUO8TeiL8CtIJFBKuIjjssqo6hhC6fxR66ZnLJaJa8VJBI_udc0dcc27_kIvjcVwmjxcmG6h4370Axcee_aJKYcURESG_Zhwhx65w50e5qpCj9b49SQcQEQoSjoT74vO1e6OTEjWUl6PlbIs5FnZbAbwITMMuCOfZeb0pGlOL5woSxErMNTItpygg0N9duIq50fSGrjKO6EVpzE3X2m20Dh0BexByXaVA-L61FZcuQRDpNh4knh0AfG7mkOY2eJsmo9EFDapMrh4Jd_4nku7fEDQ=w1196-h897-no

 

Here is a picture of the screw fully bottomed out

 

jXvbEPdx-8nzMGyOu4z4ADN2JpL4zdsvZ_Oj2gd9fFbYkWYOWZLFwxUM9sARqM_3-QVgUxM39BRDaGuRDnvIRFoorNPKbckaEJjz-tDSmiR2xPe_SjqbBdGWqasEyI1lNHdKtegWiYSHbjM8vP7zkfwx8bq7mEv5dqFpgTlxefCStUegcHnVpMygBdl2TsXn-jXRxdjSwNZbyk5Q0GD5VPWbDTivXI2P1lPH_Aienrg9NePr9-M9gNEYVuvlfKfPuSqahb2y9I-E8gicuq0F7y99K6NGmcN01Wen9Bep4dkjrBnb2-gnZdn0GeA75yNJ5FtqbKGkrsSr55-vbN1Tf9CNZc_UeVgdSDJYU_X8g1Q5ht2T-7Wn6TiwIfq8uWDtOTP0qnoHQJIcU6CXWhelOCKvrHBbMRi18-QbwiSudRcuivrkxLoy5lCwdgD49MAOlyEsThPG-PrwTSkKxm-ZMM2yWGGsfcyDjuh_SZnG3b_ECpk93iX5MqBd4b_-dokJkhrTRhwWA-vthJCYj2p4wf7oIMvCr6RAwAQPxEvsbNzGB4YAs2eumppJq2w6CnBxxhZzL3pfcWiWZkai-hizzsKGgadv5iEpW_JG62qA_y1hFN0TtQunuLQVWcRvO3wdgLD-fk2pet5QFq640ynS93OI-UtdbhlhvzU3ErzldGTvzmUN4hDeLO9l3tMSO9bWz0PwuC0aTwwcgawbUQ=w673-h897-no

 

I could almost fit the toothpick between the psu and the head of the screw, the case im using is the Vengance C70 and the sheet metal its made of is less than the thickness of the toothpick.

 

I have RMA the PSU and it should be arriving at the RMA center on friday, I have included three of the four original screws that came with the AX760i.

I had to use the fourth screw on the temporary CX750M because i dropped one of the screws that came with the new/temp PSU and couldnt find it.

 

On a side note the CX PSU i purchased, the screws are exactly the same length as the AXi ones.

Edited by jrcobb1994
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  • Corsair Employees

Those screws are the standard depth. So if your toothpick isn't going into the PSU as deep as that toothpick, the the problem is PCB layout and something obstructing the screw.

 

I'll open a AX760i and see what's located there by that screw hole.

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Those screws are the standard depth. So if your toothpick isn't going into the PSU as deep as that toothpick, the the problem is PCB layout and something obstructing the screw.

 

I'll open a AX760i and see what's located there by that screw hole.

 

Is it possible that once Corsair receives my RMAd PSU that they can look it over and tell me if the screws are the cause?

The Shipment went to <USA RMA Depot> and arrived on friday. I know you dont work for corsair but you seem close nit with them.

Edited by Technobeard
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  • Corsair Employees
Is it possible that once Corsair receives my RMAd PSU that they can look it over and tell me if the screws are the cause?

The Shipment went to 675 Sycamore Dr, Milpitas, CA 95035 and arrived on friday. I know you dont work for corsair but you seem close nit with them.

 

You would have had to ask for a failure analysis prior to shipping the PSU. Otherwise, it just gets processed as per SOP.

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You would have had to ask for a failure analysis prior to shipping the PSU. Otherwise, it just gets processed as per SOP.

Well i can give you the lot code of my PSU you did say that you might open an AX760i, If the AX760i are based on the same design as the AX860i maybe the small number of failures that people are having are from the screws they are using and how thick the case's PSU mounting plate is.

 

I will definitely be checking the New PSU they send me before i mount it, and if need be i can cut the screws to avoid this problem

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  • 5 weeks later...
  • Corsair Employees

I did! So sorry I failed to respond.

 

You are absolutely correct. There is a row of four x capacitors right inside one of the mounting screw holes. No screw is short enough to not hit this.

 

Here are some pics I took.

20190212_132424.thumb.jpg.e5944f6d3639821d591d91dcfd8b4c1b.jpg

20190212_132358.thumb.jpg.243d9ad0145dad5481121696be854454.jpg

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I received a Refurb AX860i for temporary use till new ax860i's are in.

This ax860i has the same problem. Would you be able to get word from your buddies at corsair on maybe what lot codes would be affected on both the AX760i and AX860i.

 

here is my post with pictures of the 860i with the damaged substrate.

 

http://forum.corsair.com/v3/showthread.php?t=185101

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  • 2 months later...
  • 3 months later...

I just purchased Corsair RM650x v2 CPU.

 

I have a question that may be very stupid, so pardon me:

 

 

It was provided with 4 screws, but only 3 of them seem to be usable. One screw hole is blocked.

 

When I try with a toothpick there is something obstructing it, seems like plastic or something.

 

https://imgur.com/a/19qck2j

 

Just like in this pic I found. Yet on some other pics of the same PSU it doesn't seem to be like this.

 

I definitely can't insert the 4th screw for more than 1-2 mm before it gets blocked.

 

So, is that plastic supposed to be there, is it supposed to "slide" away when I screw it, or do I dare to try in case I break something?

 

Never had this with any other PSU before, just wondering.

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  • Corsair Employees

 

When I try with a toothpick there is something obstructing it, seems like plastic or something.

 

https://imgur.com/a/19qck2j

 

Just like in this pic I found. Yet on some other pics of the same PSU it doesn't seem to be like this.

 

I definitely can't insert the 4th screw for more than 1-2 mm before it gets blocked.

 

So, is that plastic supposed to be there, is it supposed to "slide" away when I screw it, or do I dare to try in case I break something?

 

You can go ahead and screw in there. The plastic is just plastic to prevent the bottom of the PCB from touching the steel housing. The PCB is actually notched out there to allow for a long mounting screw.

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  • Corsair Employees
That is interesting, haven't seen it before with other PSU's I've used.

 

Those were either cheaper or older PSUs then.

 

Almost all PSUs have Mylar on the bottom to prevent potential short. And recently the Mylar has been wrapped around to the edge of the PCB in order to meet the newest IEC 62368-1 requirements.

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  • 9 months later...
Those were either cheaper or older PSUs then.

 

Almost all PSUs have Mylar on the bottom to prevent potential short. And recently the Mylar has been wrapped around to the edge of the PCB in order to meet the newest IEC 62368-1 requirements.

 

Mylar is widely used with many electrical product given the patent has expired. Mylar is a fairly good insulator and it is widely used in a range of applications.

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