Asus FX506LH Power on with black screen

[Bandarra]

Hi everyone! Asus FX506LH turns on with leds on and charges the battery correctly 1.05v 1.2v 1.8v 3.3v and 5v lines are correct but with a black screen.
Voltages and resistances to ground as follows:

VCC_Core 0.V 1.8 Ω
VCC_GFX 0.v 5.5 Ω
VCCSA 1.05v 17.5 Ω
NVVDD 0.8v 0.7 Ω
VCCIO 0.025v 2.7 Ω

VCCIO should be 0.95v according to the schematic on the board. VCC_GFX 0v could be due to the GTX1650 being integrated into the motherboard. I don't understand that VCC_CORE is 0v. Any ideas. Thank you

[Bandarra]

Re: Asus FX506LH Power on with black screen

I have found that VR_SVID_DATA (SDA)=1.03v, VR_SVID_ALERT# (ALERT#)= 0.1v and VR_SVID_CLK (SCLK)=1.03v

[mon2]

Re: Asus FX506LH Power on with black screen

Appears to be normal for the SMBUS voltages.

[Sephir0th]

Re: Asus FX506LH Power on with black screen

Oversimplified and normally ALERT# means no communication between the CPU and the VRM Controller (CPU not requesting voltage). Usually it's a bad CPU.

[Bandarra]

Re: Asus FX506LH Power on with black screen

Oversimplified and normally ALERT# means no communication between the CPU and the VRM Controller (CPU not requesting voltage). Usually it's a bad CPU.

Thanks for your answer.

Is it compatible with ALL_SYS_PWRGD=3.3v and if VCCIO=0.025v (nominal 0.95v)?
also PCH-PWROK=3.3v and SYSPWROK=3.3v
Thanks

[myth77]

Re: Asus FX506LH Power on with black screen

You should have vccio before vcore...

[Sephir0th]

Re: Asus FX506LH Power on with black screen

Indeed. I'd double-check the value first. Maybe just a wrong measurements and if confirmed then maybe worth to troubleshoot from there.

[Bandarra]

Re: Asus FX506LH Power on with black screen

Indeed. I'd double-check the value first. Maybe just a wrong measurements and if confirmed then maybe worth to troubleshoot from there.

All the measurements that I have published have been carried out several times, I see inconsistencies in them that I cannot understand, perhaps due to lack of knowledge and for this reason I appreciate the answers.
There is one possibility and that is that the computer was working for a year in an atmosphere with high humidity from the sea and suspended dust (Calima) in the Canary Islands, when it failed it was working near the sea. The first thing I did was clean the motherboard with Isopropyl since I saw rust on some components.
Could it be that there were false measurements due to leakage voltage on the motherboard that distorted the analysis?. Thanks a lot.