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G75VW VBios Help

0neWinged
Level 9
Alright so I have an Asus G75vw with a GTX 660m. I bought a GTX 780m and heatsink from a G750jh. I did some chassis modifications and managed to get everything to fit. Flashed new bios with vbios of 660 and 780.
I turned off UEFI prior to flash, turned UEFI off prior to card swap. Laptop fired up, but boots to Asus boot logo screen, (where you would normally access bios) but gets stuck. I cannot access bios. Trouble shooted a few things, but still no luck. Even swapped back to the 660m and boots passed the boot screen. So I then re flashed to my stock bios, and tried swapping to 780m to see if it wouldn't show the boot screen, but it does the same thing.
So.. From what I am told it is trying to load the VBIOS onboard of the 780M PCB. Also was told It definitely is a module regarding PEG control. This should be in the unlocked "Chipset" tab, but as I've mentioned a while back, this is where things can bjork the boot block and even the recovery block if a setting you enable is deep BIOS disabled.. (no supported callback module) meaning, ICSP programmer is the only way out of it. (Don't want to brick or have to find a ICSP programmer).
Any insight would be appreciated. I also have this up at WIN RAID forum as well, but figured it can't hurt to have more eyes and brains.
In the end, I just want this thing to recognize the 780 as its card and boot. I already have modified drivers, just need a successful boot.
Anyone willing to help with this modification will be highly highly appreciated.
Thanks!
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22 REPLIES 22

Hello everyone, So I have been working on a project with my g75vw. I purchased a gtx 980m 8gb from asus g750jya and installed the card. I have already modified my bios with the one of the gtx 670m and the 980m. It was flashed using a external programmer. The bios is working with the gtx 670m, but when I replaced the card with the gtx 980m 8gb (heatsink and all as well) I cant turn on the laptop. When I plug the ac in the laptop, the charger light goes off. (This was first noticed with the 180watts one. So then I taught it was not getting enough power, and I bought a 230watts one. Problem still persist. My motherboard is not bad since when I place back the gtx 670m everything works. Now I am not sure what the problem is. Dreamonic, anyone please help me resolve my issue since I can’t seem to find an answer to it. Thank you

Dreamonic
Level 12
You ended up using the ASUS VBIOS with your G73SW GPU upgrade didn't you? Even though the GPU you used was that of another manufacturer because it allowed it to boot with the best results?

The G73's, don't they use OROMs? The card you purchased, a standard MXM 3.0b GPU had the other manufacturer VBIOS onboard. So I suppose these two mods are similar in that, yours was in fact OROM supported initially (G73SW) but used the onboard VBIOS in the end with a GPU manufacturer other than with the ASUS MXM GPUs but with their VBIOS?

EDIT: I see what you're referring to now, ASUS GPU HW could be the problem with the upgrade in another sytem.

At this point im willing to try anything as long as its not permanent fail or have a fail safe.
As far as soldering, im pretty good but that bios chip is Tiny. Micro soldering at a whole new level and I dont have that kind of equipment or skill.
both cards are MXM 3.0 and have exact same pin layouts.

Just thinking here, but is it maybe possible to modify this card via hardware? hook it up externally to a desktop and have read/write access?
how can I go about stopping/bypassing (shorting) the vbios on the 780m?

57666
57667

To bad I cant find an Asus hardware specialist to diagnose this issue. compare the two builds and be able to specify.
I get it, Asus doesn't want you upgrading, they rather make money and you buy a new PC. Much more fun and satisfying to get something working in something where it doesn't belong

Dreamonic
Level 12
You ended up using the ASUS VBIOS with your G73SW GPU upgrade didn't you? Even though the GPU you used was that of another manufacturer because it allowed it to boot with the best results.

The G73's use OROMs though. The card you purchased, a standard MXM 3.0b GPU obviously had the other manufacturer VBIOS onboard. So I suppose these two mods are similar in that, yours was in fact OROM supported initially (G73SW) but used the onboard VBIOS in the end with a GPU manufacturer other than with the ASUS MXM GPUs but with their VBIOS?

I see what you're referring to now, ASUS GPU HW could be the problem with the upgrade in another system.

Dreamonic
Level 12
That kind of adapter actually exists (cool). No mention whether or not it works though with multiple vendors: http://www.pcidv.com/products.asp?id=628

To short temporarily, follow what I did in the picture below. You'll want to flash back to the M660780.ROM before doing so. Hopefully once it's temporarily disabled (bypassed) it may allow the OROM to be initialized. I'd recommend to use something of similar thickness of the pins used with the BIOS chip. Only touch the two pins in the diagram and those pins only! Do so before powering up with the AC adapter disconnected. Once those pins are bridged (keep it like that for the duration of the test) then plug AC adapter back in and power on the system.

Dataesheet: http://html.alldatasheet.net/html-pdf/178189/WINBOND/W25X40/1489/5/W25X40.html

Ill give it a go and see. hoping for the best. May the GPU gods be in my favor, lol

bread tie wire cut and bent to size. Was a touch to thick to fit between the chip and wire, so I crimped down with some tweezers and took a metal grinding disk and shaved off by hand. Did both sides. Lined up to the chip and snugged it in with a razor blade.
Now comes the real test. swap and boot.
57669

Dreamonic wrote:
That kind of adapter actually exists (cool). No mention whether or not it works though with multiple vendors: http://www.pcidv.com/products.asp?id=628

To short temporarily, follow what I did in the picture below. You'll want to flash back to the M660780.ROM before doing so. Hopefully once it's temporarily disabled (bypassed) it may allow the OROM to be initialized. I'd recommend to use something of similar thickness of the pins used with the BIOS chip. Only touch the two pins in the diagram and those pins only! Do so before powering up with the AC adapter disconnected. Once those pins are bridged (keep it like that for the duration of the test) then plug AC adapter back in and power on the system.

Dataesheet: http://html.alldatasheet.net/html-pdf/178189/WINBOND/W25X40/1489/5/W25X40.html


DUDE!!!!! You are what I call a Fu**king GODSEND!! G75VW with GTX 780M Booted into Windows Success!!!!!!!!!!!!!!!
Major break though and accomplishment! Thank you all for coming to the show
57671

So is this bridge something I should make permanent now that it is required for boot? I believe I should be able to solder those 2 points since Ill have room because its on the end.
Now im going to finish up the heatsink plate, get this thing down with some Gelid extreme and get some custom drivers booted.