Re: asus fx553vd no power to 1050 gpu

thx, but i believe that i wouldnt have any picture without PLT_RST AND DRAMRST?

And finally i found what was the problem...it was the ripped 0 ohm resistor R2346,....now all ok.

asus fx553vd schematic and boardview...

Dont know the history of laptop, On the board there were two destroyed usb connectors that i replaced. The board is turning on to bios, i have picture but i dont see gtx1050 gpu in bios only intel internal gpu is working. So i checked gpu gtx1050 voltages and there is nothing...dead and cold...no nvvds, no fbvddq...nothing.
Resistence in ohms on gpu power rail seems fine. No short anywhere that i can find. So now i am trying to figure what comes first from schematic and i am lost and need help
So i figured that i need to have NVVDDS_PWROK to rise gpu voltages. But i am not sure...

First i am noob

Second, i received this laptop, it was powering on but no display. I found that +1.2 v is missing. Then i found that +1.2V_S5 is shorted to ground. I removed and replaced RT8231AGQW and short was gone.
But...on PR1418 i have resistence 85 kohm and that resistor is 100 kohm. So i replaced it but again 85 kohm. Then i removed resistor and found out that resistence between those two lines (GND and +1.2V_VID) is more then 100 kohm, putting multimeter probes both way...but with resistor is 85 kohm??? how is that possible? i checked 5 times and resistors are...

Re: cpu/gpu capacitor short check with power supply possible?



Thank you! So, you are saying its safe to increase ampers without destroying cpu? But voltage set to 1v max?
In short, i set max voltage to 1v, and increase amps from 1A to 20A (increase it by 1A) till i fill something warming up?...

Hello, when vcore or gpucore is shorted to ground mostly it is because of dead chip...but sometimes it is dead capacitor.
Is there any way with power supply to force that capacitor to heat? If i use one volt and one amper on power supply i believe thats too low for anything to heat...but increasing voltage or ampers i risk to burn a good cpu or gpu..
Any suggestions to noob?

Re: Acer helios 300 noob questions...

I understand what you say...but i have read and seen many times people saying different...so i am.bit confused...And they are not noobs like me. I am not saying you are wrong...just want to clear things out....for example on this video the repair guy is saying its safe to apply 19v if used with low current ..If you dont want to watch whole video...go from 19:00 .... [url]https://youtu.be/WU8_eTglue0[/url]

And can someone answer to my second question? ThxRe: Acer helios 300 noob questions..... you say...but

I have this motherboard and it was shorted somewhere on main 19v line...or after...Finally after many desoldering and using boardview and schematic it was shorted mosfet on cpu power rail... Now its all ok but i have two noob questions:

1. Could i have used bench power supply and set it on 19v with 1 amp limit to main 19 v power rail to find what is hot or it would burn something on the way like cpu because it was shorted through the mosfet? I read many articlas and many forums...and some people are saying no,no,no, it is not good idea to use 19v on shorted motherboard on main power...

Hi, i am noob in repairing electronics and motherboards...and most of the time i am still trying to understand how things work...So, lately i have been using and testing motherboards in diode mode. Most of the motherboards that i test are not working and broken. The question is that if i use multimeter in diode mode on high 19vol rails sometimes i read fixed number in multimeter but on some other boards reading in diode mode is rising indefinitely till i read 1. I am talking on lets say ac_bat 19volt rails on motherboards. So, i dont understand how it is rising indefinitely? In theory if only...

Re: New Members - please post your introductions here

Hi, from Croatia..nice to meet you