Asus n551jk need info for uma conversion

[Francisco.s]

Hi, need to know if this board can work with integrated intel graphics.

It has two pins in pch for mobo config, (PCB_ID0, PCB_ID1)

Any help will be welcome.

[Francisco.s]

Re: Asus n551jk need info for uma conversion

Nobody?

The idea is to disable nvidia gpu, and let only intel graphics.

I think there should be some resistor to remove in order to do it.

Thanks.

[KvnTM]

Re: Asus n551jk need info for uma conversion

It will be impossible to do with no schematic and I can't find one. Please post a request in this thread: Schematic Requests ONLY!

[Francisco.s]

Re: Asus n551jk need info for uma conversion

It will be impossible to do with no schematic and I can't find one

I'm afraid it will be impossible to get schematic for this asus.

Seems that asus only "shares" boardview and repair guides.

The coils for +NVVDD (PL8501, PL8502) had been removed just in case. (some boards switch automatically without +vgacore)

Here's the boardview:

[KvnTM]

Re: Asus n551jk need info for uma conversion

I'm afraid it will be impossible to get schematic for this asus.

Seems that asus only "shares" boardview and repair guides.

The coils for +NVVDD (PL8501, PL8502) had been removed just in case. (some boards switch automatically without +vgacore)

Here's the boardview:

I'll try to figure it out with the boardview. Cant promise anything though.. It's very hard without schematic.

[Francisco.s]

Re: Asus n551jk need info for uma conversion

I'll try to figure it out with the boardview. Cant promise anything though.. It's very hard without schematic.

I agree with you, it's very difficult without schematic, the boardview usually helps a lot, but not in this case.

I have been using the schematic of a Quanta JW5 r1A that mounts a Haswell cpu and a Nvidia N15P-GT gpu.

I can't find the equivalent signal DGPU_PRSNT# in the asus board.

Thanks for your help.

Here is the Quanta JW5 schematic:

[KvnTM]

Re: Asus n551jk need info for uma conversion

I agree with you, it's very difficult without schematic, the boardview usually helps a lot, but not in this case.

I have been using the schematic of a Quanta JW5 r1A that mounts a Haswell cpu and a Nvidia N15P-GT gpu.

I can't find the equivalent signal DGPU_PRSNT# in the asus board.

Thanks for your help.

Here is the Quanta JW5 schematic:

I'm pretty sure it is possible. The GPU video output is connected through FDI and the eDP port on the lcd connector goes into the CPU. So it does have switchable graphics.

You already removed vcore from the GPU and it didn't work, correct?
Maybe there's a different bios for the UMA version? (if there was one)

And also.. what was the problem with the GPU to begin with?

[Francisco.s]

Re: Asus n551jk need info for uma conversion

You already removed vcore from the GPU and it didn't work, correct?

Yes, I did it.

It can read from hdd or usb and load OS, but have no video on lcd panel or hdmi.

I have searched internet for a uma bios but can not find it.

Have you used amibcp program to mod the original bios?

Thanks.

[Francisco.s]

Re: Asus n551jk need info for uma conversion

And also.. what was the problem with the GPU to begin with?

I think the nvidia gpu chip is dead, the reset signal for vram is always in reset state. (0,1 volts)

This reset signal is controlled by FBB_CMD5 pin from gpu.

I'm still investigating gpu circuit in order to find out what causes this low level in vram.

[KvnTM]

Re: Asus n551jk need info for uma conversion

I think the nvidia gpu chip is dead, the reset signal for vram is always in reset state. (0,1 volts)

This reset signal is controlled by FBB_CMD5 pin from gpu.

I'm still investigating gpu circuit in order to find out what causes this low level in vram.

I'm not an expert on memory chips but are you sure that FBB_CMD5 is your reset signal? There are many FBB_CMD pins and I assume those are for data communication.

Were all power rails present for the gpu before?

[Francisco.s]

Re: Asus n551jk need info for uma conversion

are you sure that FBB_CMD5 is your reset signal?

I think so, this signal goes to all 4 vram, and connected to its reset pin. (it changes this rare name to RESET# at memory side) (pin RESET# is near A13 and A7 in U7303)

The last signal also bad is DGPU_RST# controlled by U7004.

It is not clear how U7004, but at the end, seems that it is controlled by PCH, (U2001) through its pin GPIO50. (GPU_RST#)

I am using a winstron schematic that is almost identical:
(you can see GPIO50 and RESET# more clear)

[Francisco.s]

Re: Asus n551jk need info for uma conversion

I think the nvidia gpu chip is dead, the reset signal for vram is always in reset state. (0,1 volts)

This problem was caused by a corrupted bios, I have reprogram the original dump and all reset signals are ok.

With a good bios, reset signals from gpu circuit are good, but lcd panel and hdmi port still don't work.

Time for a new board.

Without schematic is extremely difficult.

[KvnTM]

Re: Asus n551jk need info for uma conversion

This problem was caused by a corrupted bios, I have reprogram the original dump and all reset signals are ok.

With a good bios, reset signals from gpu circuit are good, but lcd panel and hdmi port still don't work.

Time for a new board.

Without schematic is extremely difficult.

Hold on!
Did you flash the main bios or video bios? If you flashed the main bios it could take around 20 Seconds until something comes up on the screen if it was a dump from another board. This happens when you flash a dump without clearing the ME Region first.

[Francisco.s]

Re: Asus n551jk need info for uma conversion

Hold on!
Did you flash the main bios or video bios? If you flashed the main bios it could take around 20 Seconds until something comes up on the screen if it was a dump from another board. This happens when you flash a dump without clearing the ME Region first.

I did flashed main bios and ec-bios, and main bios have been flashed with clean ME region dumps.
Laptop can boot from usb or hard disk, and usb-mouse/ keyboard also work.

The original bios boots without any delay, and new flashed bios have no delay when boots a second time.