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Old 11-26-2021, 04:23 PM   #1
dicky96
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Default HD7950 missing mosfet

i guys I have this Dual X Radeon HD7950

All the resistances check OK (and all other voltage rails are up) but I have a missing High side mosfet on the Vram VRM so that rail is down of course. Resistance on Vram is 60 ohm which is just fine.

Does anyone know what the missing component should be?

See pics - and thanks
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File Type: jpg 20211126_155532.jpg (856.1 KB, 35 views)
File Type: jpg 20211126_155510.jpg (596.0 KB, 28 views)
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Last edited by dicky96; 11-26-2021 at 04:27 PM..
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Old 11-27-2021, 12:51 AM   #2
WayOfTheRoad
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Default Re: HD7950 missing mosfet

Is there a specific manufacturer for that card? I may know someone with that card but I'd like to be able to give all info available when asking.
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Old 11-27-2021, 04:04 AM   #3
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Default Re: HD7950 missing mosfet

OK Thanks, I'll check this morning and let you know
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Old 11-27-2021, 06:12 AM   #4
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Default Re: HD7950 missing mosfet

I didn't see as brand on it but hopefully these pics help?
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File Type: jpg 2.jpg (541.3 KB, 14 views)
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Old 11-27-2021, 06:33 AM   #5
vinceroger69
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Default Re: HD7950 missing mosfet

Maybe this Sapphire Radeon HD 7950 3GB GDDR5 PCI-E
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Old 11-27-2021, 06:54 AM   #6
SMDFlea
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Default Re: HD7950 missing mosfet

Quote:
Originally Posted by dicky96 View Post
i guys I have this Dual X Radeon HD7950

All the resistances check OK (and all other voltage rails are up) but I have a missing High side mosfet on the Vram VRM so that rail is down of course. Resistance on Vram is 60 ohm which is just fine.

Does anyone know what the missing component should be?

See pics - and thanks
There`s a Sapphire sticker and a part number on the pcb 109-C38137-00 .Had a look for a schematic,can`t find one.
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Old 11-27-2021, 07:39 AM   #7
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Default Re: HD7950 missing mosfet

Well spotted - yes it's that one for sure
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Old 11-27-2021, 07:46 AM   #8
lotas
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Default Re: HD7950 missing mosfet

Textolite with number 109-C38137-00 is the same as for SAPPHIRE DUAL-X R9 280 3GB GDDR5 OC WITH BOOST.
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Old 11-27-2021, 09:10 AM   #9
SMDFlea
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Default Re: HD7950 missing mosfet

Quote:
Originally Posted by lotas View Post
Textolite with number 109-C38137-00 is the same as for SAPPHIRE DUAL-X R9 280 3GB GDDR5 OC WITH BOOST.
Thanks for the info lotas .

NTMFS4C10N https://www.onsemi.com/pdf/datasheet/ntmfs4c10n-d.pdf

https://i2hard.ru/wp-content/uploads...0Dual-X/31.JPG
https://i2hard.ru/publications/21271/
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Old 11-27-2021, 09:28 AM   #10
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Default Re: HD7950 missing mosfet

Dual Channel mosfet??
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Old 11-27-2021, 09:53 AM   #11
dicky96
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Default Re: HD7950 missing mosfet

@lotas @SMDFlea
Thanks guys, nice work. Parts ordered.


@pixcelart
No it's definitely as single channel mosfet

Last edited by dicky96; 11-27-2021 at 09:56 AM..
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