[SOLVED] Voltage Needed Reference 6900xt ch341a

[Otito]

Hi, i bricked my gpu (XFX RX 6900xt Reference) and i got a ch341a programmer to fix it. The thing is i havent taken it apart yet and also i forgot to buy the 1.8v adapter and i want to know, if its possible, if ill need to buy the adapter befor i take the gpu off my pc. So my question is. Has any of you guys reprogrammed a 6900xt reference? What voltage did you need?

 

[VuurVOS]

The reference RX 6900XT uses a 25Q80CT -> https://www.techpowerup.com/review/amd-radeon-rx-6900-xt/images/front_full.jpg
25Q80CT is rated at 3.3V -> https://www.alldatasheet.com/view.jsp?Searchword=25Q80CT&sField=1

Which version of the CH341A do you have? First version does not provide 3.3V correctly.

 

[Otito]

Well i bought the ch341a but looking at the chip name it says ch341b. I found a chinese datasheet and translated it.

 

[meatwar]

Gona make a little correction if i may...
It could be a GigaDevice GD25Q80C(T: SOP8 150mil)

 

[VuurVOS]

Well i bought the ch341a but looking at the chip name it says ch341b. I found a chinese datasheet and translated it.

This one can break your RX 6900XT when trying to flash with 3.3V since the data lines are still 5V.....

 

[Otito]

I there any modification i might be able to do to make the data lines 3.3v? And if my bios chip ended up being 1.8v instead of 3.3v what would the modification be? I saw that there is an adapter for 1.8v
Edit: Found this video:

im going to tear down my gpu to check for the bios chip and follow the video's guide for the programmer

 

[VuurVOS]

I there any modification i might be able to do to make the data lines 3.3v? And if my bios chip ended up being 1.8v instead of 3.3v what would the modification be? I saw that there is an adapter for 1.8v
Edit: Found this video:

im going to tear down my gpu to check for the bios chip and follow the video's guide for the programmer

The mod is only for 3.3V.

There is a different version (v1.7) of the CH341A programmer which doesnt have that issue:

https://www.aliexpress.com/item/1005005734526117.html

 

[Otito]

Okay, I took apart the GPU and here is the bios chip. It is indeed the 25Q80CT. I'll only use the ch341 for this, so it should be alright with that modification, right?

 

[Otito]

Alright i flashed the bios succesfully guys. Althought it seems like the issue i have with my gpu is something else, ill have to either troubleshoot or pay for repair. Thank you guys for helping me!