Corsair TX-750 problem with finding component

johnis82 · 11-06-2021, 04:18 AM

Hello guys i have opened a dead Corsair psu and i found a burned ic with 7 pins. Because i can't find any schematics for this PSU ,I said to ask a question here. Thanks in advanced!

victorcas · 11-06-2021, 06:24 AM

I have a Corsair CS750M and it uses a TNY278pn. Im not sure if its the same. Maybe you can check the datasheet and see if it fits.

Usually, when those components explode, it means there is something in short...

On the side of the big capacitor there is a resistor that seems to be broken. Did you checked that?

johnis82 · 11-06-2021, 08:57 AM

First of all thanks for the fast reply, i appreciate that! No i did not see that but i needed to find first the ic and then watch around the board for other component defects. Hmm you mean the little one next to the rectifier capacitor?(big one) do you know the value for this too?

johnis82 · 11-06-2021, 09:06 AM

victorcas Do you have a schematic diagram for your PSU?

**R_J** · 11-06-2021, 05:42 PM

The top of the ic was likely still in the case somewhere, did you check? Check the trace side of the board, if it is a TNY278pn, pins 5~8 (source) are connected together.

**RJARRRPCGP** · 11-07-2021, 01:09 AM

IIRC, I have a later TX (TX850M) with much better cap choices.

IIRC, that one doesn't look better than a later CX, cap-wise.

victorcas · 11-07-2021, 08:37 AM

Quote:

Originally Posted by johnis82

First of all thanks for the fast reply, i appreciate that! No i did not see that but i needed to find first the ic and then watch around the board for other component defects. Hmm you mean the little one next to the rectifier capacitor?(big one) do you know the value for this too?

No, I have no idea... It seems to be a 1/2W resistor with a 1% tolerance. It may be used for current measurement. The value is impossible to read. It looks something like "green - brown - ? - ? - brown". You can check it with a multimeter to see if it is actually broken.

Quote:

Originally Posted by johnis82

victorcas Do you have a schematic diagram for your PSU?

No. It is almost impossible to find a schematic of a modern power supply, especially the Corsair ones. I think the only way to find out the broken components is to compare it to another Corsair PSU.

That power supply seems to have a single layer PCB, so you can follow the traces and try to draw a schematic. With that, you might be able to find compatible components.

johnis82 · 11-07-2021, 10:14 AM

Thanks for the info guys i'll open it again and see if i can find anything.
Thanks again for your time

11-06-2021, 06:24 AM	#2
victorcas New Member Join Date: Oct 2021 City & State: Málaga My Country: España Line Voltage: 230VAC 50Hz I'm a: Hobbyist Tech Posts: 12	Re: Corsair TX-750 problem with finding component I have a Corsair CS750M and it uses a TNY278pn. Im not sure if its the same. Maybe you can check the datasheet and see if it fits. Usually, when those components explode, it means there is something in short... On the side of the big capacitor there is a resistor that seems to be broken. Did you checked that?

11-06-2021, 08:57 AM	#3
johnis82 New Member Join Date: Apr 2016 City & State: Florina My Country: Greece I'm a: Knowledge Seeker Posts: 15	Re: Corsair TX-750 problem with finding component First of all thanks for the fast reply, i appreciate that! No i did not see that but i needed to find first the ic and then watch around the board for other component defects. Hmm you mean the little one next to the rectifier capacitor?(big one) do you know the value for this too?

11-06-2021, 09:06 AM	#4
johnis82 New Member Join Date: Apr 2016 City & State: Florina My Country: Greece I'm a: Knowledge Seeker Posts: 15	Re: Corsair TX-750 problem with finding component victorcas Do you have a schematic diagram for your PSU?

11-06-2021, 05:42 PM	#5
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 7,995	Re: Corsair TX-750 problem with finding component The top of the ic was likely still in the case somewhere, did you check? Check the trace side of the board, if it is a TNY278pn, pins 5~8 (source) are connected together. Last edited by R_J; 11-06-2021 at 06:04 PM..

11-07-2021, 01:09 AM	#6
RJARRRPCGP Badcaps Veteran Join Date: Jul 2004 City & State: North Springfield, Vermont My Country: USA Line Voltage: 118-127V 59-63.5 Hz-> actualizo: pérdido de voltaje I'm a: Knowledge Seeker Posts: 6,029	Re: Corsair TX-750 problem with finding component IIRC, I have a later TX (TX850M) with much better cap choices. IIRC, that one doesn't look better than a later CX, cap-wise. __________________ ASRock B550 PG Velocita Ryzen 5 "Vermeer" 5600X 16 GB G. Skill Ripjaws V F4-3200C14D-16GVR Sapphire Nitro+ Radeon RX 6600 XT eVGA Supernova G3 750W Samsung 970 Pro 512 GB NVMe SSD "¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr"!" -mí mismo "There's nothing more unattractive than a chick smoking a cigarette" -Topcat "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747 Last edited by RJARRRPCGP; 11-07-2021 at 01:11 AM..

11-07-2021, 10:14 AM	#8
johnis82 New Member Join Date: Apr 2016 City & State: Florina My Country: Greece I'm a: Knowledge Seeker Posts: 15	Re: Corsair TX-750 problem with finding component Thanks for the info guys i'll open it again and see if i can find anything. Thanks again for your time

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