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Old 01-20-2015, 04:06 AM   #1
c_hegge
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Default MSI 945GCM5 V2 Full Poly-mod

I've said before here that I've found MSI boards to be fairly tolerant of being poly-modded, and today, I did another one. A 945CGM5-F V2 to be exact.

The CPU VRM high got 470uF Nich LG 16V polies, while the low side got 820uF 2.5 OS-CONs.

The others which originally had 470uF either got that or 330uF as replacements

There were two 1500uF caps on the RAM VRM which were replaced with 820uF 6.3V Nichicon L8, and there were 3 220uF 10V caps near the chipset which were replaced with 220uF 6.3V NCC PSC.

Everywhere else (which originally had 1000uF 6.3V lytics) got either 1000uF or 820uF 6.3V Nichicon L8.

I was quite interested in doing this board as there is what appears to be a linear regulator in the 3rd picture here (in between the CMOS battery and DIMM slot), which gets very hot, and the lone cap immediately above it is usually the first to go on these boards. Hopefully, the poly will handle the heat a bit better.
Attached Images
File Type: jpg 945cgm5-polymod.JPG (585.2 KB, 132 views)
File Type: jpg 945gcm5-cpuvrm.JPG (387.8 KB, 104 views)
File Type: jpg 945gcm5-linear.JPG (381.3 KB, 97 views)
File Type: jpg 945gcm5-vdimm.JPG (510.7 KB, 75 views)
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Old 07-16-2015, 03:44 PM   #2
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Default Re: MSI 945GCM5 V2 Full Poly-mod

i have msi 945gcm7 board that wasn't start. only 1-2 second fans spins
after the i have change vrm caps fans spin properly but there is no beep sounds or display.

what is the problem.
could i rewrite the bios?
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Old 07-19-2015, 12:38 AM   #3
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Say reflash it? If that, then with an external controller, yes
If it's a real rewrite, then pretty much no.
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Old 07-19-2015, 01:11 PM   #4
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Default Re: MSI 945GCM5 V2 Full Poly-mod

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Originally Posted by TechGeek View Post
Say reflash it? If that, then with an external controller, yes
If it's a real rewrite, then pretty much no.
i mean hot reflash.
Another healthy mobo starts. we go to bios update screen.
at that moment we desolder original bios chip and solder patient chip and reflash.

i've repaired 9 msi g31m3 mobo this way..

i have many corrupted boards that new or old.

no needs to greed. i don't pay the thing because of that is new.

my g31m3 is enough win7 and for me

Last edited by mikail13; 07-19-2015 at 01:27 PM..
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Old 07-21-2015, 12:40 PM   #5
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Don't know how I missed this thread. Nice one, c_hegge. Looks really good. What were the brands of the original caps?
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Old 07-21-2015, 03:24 PM   #6
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Default Re: MSI 945GCM5 V2 Full Poly-mod

why the mix of brands and types?
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Old 07-21-2015, 04:53 PM   #7
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Quote:
Originally Posted by Pentium4 View Post
Don't know how I missed this thread. Nice one, c_hegge. Looks really good. What were the brands of the original caps?
OST and Teapo, and possibly a few KZGs

Quote:
Originally Posted by stj View Post
why the mix of brands and types?
Because that was what I had on hand.

Last edited by c_hegge; 07-21-2015 at 04:55 PM..
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Old 07-21-2015, 07:54 PM   #8
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Were any of the original caps bulging? I'm a big fan of 945 boards, especially well built ones. They're extremely reliable in my experience.
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Old 07-21-2015, 09:37 PM   #9
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Default Re: MSI 945GCM5 V2 Full Poly-mod

I think they might have still been OK on this particular board, but it was only an old lady who used it, and probably only once every couple of weeks. The cheap sleeve bearing case and PSU fans hadn't even seized
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Old 09-03-2015, 09:30 AM   #10
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Quote:
Originally Posted by c_hegge View Post
Everywhere else (which originally had 1000uF 6.3V lytics) got either 1000uF or 820uF 6.3V Nichicon L8.
Hello, I'm new here. I've been here for a few days observing and learning little by little. I plan to recap my old dead P4 MSI board with poly in a few months.

I want to ask, can we use higher uF poly to replace wet electrolytic cap.
For example, using Nichicon L8 6.3V 1200uF to replace 6.3V 1000uF lytic?


Thank you.
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Old 09-03-2015, 04:23 PM   #11
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Yes, you can do that. Especially the VRM would benefit from such low ESR caps. However, in my opinion I think that is a waste of money. Poly caps are pretty expensive. You can use 560F 6.3V to replace 1000F 6.3V lytics and they will still perform much better.
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Old 09-03-2015, 09:16 PM   #12
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Quote:
Originally Posted by Pentium4 View Post
Yes, you can do that. Especially the VRM would benefit from such low ESR caps. However, in my opinion I think that is a waste of money. Poly caps are pretty expensive. You can use 560F 6.3V to replace 1000F 6.3V lytics and they will still perform much better.
Thank you for the feedback. Actually I already know that you can use lower uF poly caps in the VRM side, but I still cannot find about replacing higher uF poly caps other than VRM.

Yes it's a waste of money. But should there be a situation for example where I don't have lower uF poly to use only a higher uF available, can I still use it?
It's just a hypothetical question for a reference in the future.

VRM (CPU/RAM):
Lower uF poly replacing higher uF lytic = OK

Other than VRM:
Lower uF poly replacing higher uF lytic = OK or Not?
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Old 09-04-2015, 12:14 AM   #13
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Default Re: MSI 945GCM5 V2 Full Poly-mod

What I've been lead to believe is that the half-capacitance when poly-modding rule only applies blanketly to the CPU VRM and other similar DC-DC conversion circuits on the motherboard. I haven't tried it much on the other 1000uF caps on any motherboard.
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Old 09-04-2015, 02:59 AM   #14
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Default Re: MSI 945GCM5 V2 Full Poly-mod

I've used a 330F poly caps to replace a 1000F lytics, and never ran into any stability issues even after 18 months.
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Old 09-04-2015, 03:51 AM   #15
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Default Re: MSI 945GCM5 V2 Full Poly-mod

good, because i want to replace a 3300uf lytic with a 2000uf poly on a motherboard power input.
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Old 10-26-2016, 11:26 AM   #16
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Default Re: MSI 945GCM5 V2 Full Poly-mod

i have the same mainboard which after psu fail it did not open again . i have put a new psu but the mainboard does not respond . the only think lights its the stand by led nothing else. what shall i check ?
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Old 10-27-2016, 02:07 AM   #17
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Quote:
Originally Posted by Boyxba View Post
i have the same mainboard which after psu fail it did not open again . i have put a new psu but the mainboard does not respond . the only think lights its the stand by led nothing else. what shall i check ?
If you left the mobo for longer than a month or two , and since the 945 is already relatively old , then the first thing to begin with is to check for a failed Cmos battery .
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Old 11-07-2016, 01:32 AM   #18
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Default Re: MSI 945GCM5 V2 Full Poly-mod

Unplug the 12V power connector. Does the motherboard still not boot up?
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