Asus Tuf FX505DY display issue.

[soumya199929]

So i currently have asus tuf fx505dy laptop that is booting upto asus logo and then it is shows a blank screen (it should show windows) also i can get inside the recovery and advance startup but when it is trying to boot to windows it is always a blank screen with the backlight present. So i want help to fix my own laptop that i have been using for past 4 years and also started a journey with badcaps with this laptop only, i can do microsoldering and i hve the schematic and boardview for this laptop so please help to fix this.

[soumya199929]

Is this the right place to start this thread or I did it in the wrong section?

[jasko_jacker]

have you tried reprogramming the bios, have you checked whether you have the same problem with the external screen?

[reformatt]

Try a clean install of Windows on a spare drive. Rule out software before looking at hardware.

[soumya199929]

Already flashed the bios and changed the ssd and did a fresh windows installation but nothing changed. I think the problem is in gpu section or may be the thermal related components in gpu section.

[jasko_jacker]

Have you tried starting Windows in safe mode with the GPU drivers disabled?

[jasko_jacker]

In these cases, it is not easy to pinpoint the exact issue regarding the GPU. If you truly believe it is the GPU, you should start by checking if the memory has the correct voltage and if the GPU has the proper resistance value in ohms.

[reformatt]

In the initial clean install environment, Windows will have a default basic display driver. If it works in VGA mode in BIOS, recovery etc, it should work in Windows in that mode. Bad GPU's often cause a blue screen or display failure once their driver is loaded.

But I agree, try in safe mode as that only uses basic drivers only. I'd probably remove the board and look over it for corrosion etc. I often see Asus boards with corroded test pads/components/tracks, usually somewhere near the fan exhaust. They are the only manufacturer I've seen who blow air over the board, rather than suck it out and blow it out the side/back.

[soumya199929]

Yes in safe mode it boots into windows perfectly fine so that's why I think something is stopping my discreet to function properly in normal mode.

[jasko_jacker]

I think if it works correctly in safe mode then you will probably see the dedicated video card driver either with a warning (like an exclamation mark) or in the case that the video chip is not detected, you will not see any driver. However, if the driver is present, disable it without deleting it, also check what type of driver the integrated card is managing (generic?). With the driver disabled it should also start in normal mode.

[jasko_jacker]

Usually with the behavior you described the problem is not solved via software. You first need to figure out which GPU-related component is damaged and it's likely the chip itself that is damaged.

[soumya199929]

I'll share what happens if I disable the driver and also the 1.5v v_mem rail and impedance of the gpu chip itself.

[soumya199929]

Yes by disabling the discrete graphics driver it works but I would like to give a try on repairing it fully if possible. Also yes the 1.5v is present and the impedance is like 1.7ohm but I doubt my probes.

[jasko_jacker]

We are doing these tests to understand for sure if the problem comes from the GPU. From what you write it seems that the GPU has some problems that affect the chip itself. I asked if the 1.5V voltage was present to partially understand the state of the video memory and the ohms to understand if there had been a short on the power supply line. It's strange that both the voltage and the resistive value are correct. There is a great possibility that the only solution is to replace the graphics chip however it would be worth carrying out further tests.