-
Follow me on YouTube
------------------
Learn Electronics Repair
https://www.youtube.com/channel/UCFX...R8UZ2vg/videos -
Re: GTX1060 not working, Vcore down to 0.3V
Hello Steptech,
Did you managed to solve this issue?
Currently I'm facing some kind of similar issue with my GTX 1070.
GPU works, but after I put some load (for example benchmark) card immediately goes off. I found that Vcore is missing and following voltages.
Currently what I have checked is that:
1. Vref=2V after crash;
2. En=2.4V after crash;
3. 5VCC=5V after crash.
So these are not the issue.
However what I have found that COMP goes from 2.2V to 0V after card crashes. And of course when COMP goes down, FB is also 0. Only EAP still has voltage. So from my point of view, when COMP/FB goes down UVP turns on (VFb<0.5xVeap solves equation).Comment
-
I have an Evga 1080 for repair.
There was a short on the 12v and a burn hole in the bottom stage of the vcore.
I cleaned it out and the short is gone.
Iv checked all the resistance on the minor rails and there good.
Voltages are.
12v
3.3v
5v
1.8v
Vcore 0v
Vmem 1.3v
Pex 16mv
I thought you need to have vcore or pex before vmem would turn on so it leaves me a bit confused.
Iv looked at the vcore ic NCP81274 and I get
Enable 1.8v low?
Vcc 5v
Vref 2v
Pgood 0v
I did some digging... -
Hi,
I have an RTX 2080 ti (Zotac - triple fan) with no video output.
So far I have measured the following:- PS_FBVDD_PH3_SW = 40 ohm to ground (Micron ICs) - Memory should be fine right?
- 12V power rail present
- 3.3V power rail present
- 5V power rail present
- 1.8V power rail present
- Vcore power rail missing --> PS_NVVDD_VREF is present. (from uP9512P / U812)
- Vmem power rail missing --> Not there because Vcore power rail is missing.
Any idea? I have already tried to flash the BIOS chip (backup got created) - sadly no changes.
Source: https://www.techp... -
Hi, Would appreciate some help.
I have an Apple Late 2013 15" A1398 MacBook Pro with Logic Board 820-3662.
Get charger light but no fan spin or chime. No liquid damage.
Found PPBUS and VCORE both shorted to ground. Other rails were ok.
Removed VCORE MOSFETS U7310, U7320 and U7330. Found U7330 was in fact shorted.
With the 3 MOSFETS removed, get PPBUS and fan spin. VCORE is still hard shorted to ground (0 ohms).
Attempted voltage insertion on VCORE to locate short using bench supply set at 1.0 VDC and 4.95 Amps (max current for my... -
Hi, have a HP workstation Z2 Mini 4G for repair with CPU vcore missing.
The resistance at the output of CPU vcore coils, is less than one ohm so I think CPU could be damaged, but no mosfet are damaged.
It mounts an i7 8th gen, and have only i5 7th gen for test, but I think it is not compatible.
Without CPU in the socket there is no short, but there is no vcore voltag, and it emits a beep like no detecting ram.
The controller chip for cpu vcore is a MP2949A, and has no enable voltage at pin 37.
I wonder which circuit generates this enable... -
Hi,
My laptop went dead and after checking ,the main 19 volt power rail was shorted. After some checks i could identify that a high side vcore mosfet was shorted.
I replaced the mosfet and now the white powerled is present , fans start spinning but capslock shows the famous 5 long and 3 short code.
I checked the vcore voltages after replacement and i get for all 1.01 V so means for me that the driver is still working of the replaced shorted mosfet. On the Nvidia i measure around 0.8 V after the mosfets.
I did voltage injection on the cpu with 0.7V and i have a current...
Comment