EVGA GTX 980 TI black screen when launching a game - Why?

[fab13]

I have a problem with an EVGA GTX 980 TI,

I have a problem with an EVGA GTX 980 TI it displays a black screen when starting a game on the menu for example either in HDMI OR DISPLAY PORT.

The basic problem is that the card does not boot, the FDMF 6823A mosfet shorts internally on the 12V line and I also changed an original one and now the card boots.

Driver installation OK
Detection of the card OK
No black screen on the desktop
No short circuit on the GPU
All voltages stable

The problem is when starting a game, black screen with the game sound in the background.
The problem seems to happen at a higher current demand on the gpu.
The card doesn't shut down and when I turn it back on the desktop is displayed.

Work done
- Changed again the controller by an original FDMF 6823A always black screen when starting a game (Value 6 Kohm on the 12 Volts seems ok), ohm test on the two internal mosfets at the gate ok about 30 Kohm) of the controller

- Flash bios by a new version always black screen in game.

What would be the cause ?
Is it a bad soldering of the FDMF 6823A?
What else should I check?


Many thanks to you =D =D

Translated with www.DeepL.com/Translator (free version)

[fab13]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

See on GPUZ monitor everything seems detected

1) GPU clock and well at 1102 mhz stable from the start of a game

2) No code 43 in device manager

What I just tried:
Revert to old bios still same problem

New 27 mhz crystal oscillator still same problem.

I don't know what to do ^^

[ktmmotocross]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

make memory error test

[ktmmotocross]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

try to run furmark on low resolution like 640x480

[fab13]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

Thanks for the feedback.

Still the same in low resolution 640x480 in HDMI or DP at launch furmark
Still rotating fan.

VCORE test goes from 0.93 V to 0 V during black screen which is logical and stays at 0
Reboot of the card and display ok on the desktop etc..
Mosfet VRAM test ok in kiloOhm
Test of all mosfets FDMF 6823A Gate,LGATE value in kiloohm and PWM too.
Vcore ok in ohm no short circuit

Test Mats some slight errors not exceeding 64 ? The numbers are low?

I am lost, my resources are empty
Another idea or test =D

[ktmmotocross]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

check function of all phases with scope

[fab13]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

Checking all phases ok in the office and stable at 0.90V and even VRAM 1.50V
As soon as the game is started 0V all phases Vcore and Vmeme and VPEX and with the thermal camera there is not one that overheats.
I can hear a slight bang on the board but no short circuit.
The previous owner tells me that he had to underclock the card to get it to work.

Here are the measurements for each phase on the FDMF6823A dual mosfet controllers.
All are approximately equal

1 SMOD# = 300 Kohm / 0.7V diode mode
2 Vcin= 1.7 k / 0.4V
3 VDRV = 1.68 K / 0.45V
4 Boot = Between 290 Kohm and 378 Kohm / 0.48V
5 = Ground
6 Gate Hight = Between 30 Kohm and 35K / 0.427 V
7 PH = 2.4 ohm to GPU coil
8 = NC
9 to 14 = VIN = 12 Volts ok
15 VSWH = 2.3 Ohm also goes to GPU coil
16 to 28 = Ground
29 and 35 = VSWH = 2.3 Ohm
36 Gate Low = 30 Kohm / 0.427 V
37 Ground
38 THWN (Thermal warning flag) = No value
39 Disb = between 290 kohm and 99 k
40 PWM = between 6.2 Kohm and 7 Kohm = 0.427 V

What is strange is that the first FDMF6823A row 1 on VIN pin 9 to 14 shows me no value in KOhm, Mohm, Ohm
12V input measurement ok and 0.470 V

Here's another idea? lol

[ktmmotocross]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

i mean check function of vgpu phases with osciloscope

[fab13]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

Thanks for your feedback
Do you find anything wrong with the measurements?


Ouch lol I don't have an oscilloscope yet

Is that enough on Aliexpress?

https://fr.aliexpress.com/item/10050...yAdapt=glo2fra

[ktmmotocross]

Re: EVGA GTX 980 TI black screen when launching a game - Why?

better is usb scope like hantek or instrustar