Is the GPU shorted? I think yes. What do you think?

[sikocan]

GPU: N18E-G2-A1
Board: GA-RP65X9
Model: GIGABYTE AERO15 X9-9RT5 I9-8950Hk RTX-2070

History: Lines on the bottom of the screen as pictured.
Tech replaces LCD with the battery and power removed, same exact model screen.
Laptop will not charge or turn on any longer.

GPU side resistance is 0.096 Ohms with MESR-100 ESR Meter with the probes zeroed.

Thank you, any input is appreciated.

[ktmmotocross]

Re: Is the GPU shorted? I think yes. What do you think?

inject 1V 10A, with IPA on chip and u will be sure if u see a spot.

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

I've injected 0.9V at 2Amps - controlled. GPU did get slowly the longer I held it under thermal camera. Not doing 10amps

This is the temp attached.

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

Photo

[ktmmotocross]

Re: Is the GPU shorted? I think yes. What do you think?

dont know if it is enought W to show heatspot. gpu is using 80-100W normaly

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

Posted image.

[ktmmotocross]

Re: Is the GPU shorted? I think yes. What do you think?

if u heat it slowly u miss the heatspot

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

So you mean if I come with high amp quickly, if it's something apart from GPU sorted, it'll glow first? I can try now

[rediii]

Re: Is the GPU shorted? I think yes. What do you think?

So you mean if I come with high amp quickly, if it's something apart from GPU sorted, it'll glow first? I can try now

"heat spot" doesn't always work, but it's a nice technique. and yes, go with high amps

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

I think this is good, GPU is fine I think.

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

NVVDD
NVIDIA GPU POWER source of injection.

[rediii]

Re: Is the GPU shorted? I think yes. What do you think?

NVVDD
NVIDIA GPU POWER source of injection.

post some measurments then. did you try to start the board "naked" with external monitor?

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

Board will not receive power after first MOSFET due to bqchip not allowing it.

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

I can't do high amps, at 0.9 it's limiting to 2amps with short killer and I will not go further.

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

Short killer values

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

I'll post more measurements tomorrow, even 19v at Shant resistor will not take any current with GPU coils back and battery connected to see if it'll charge battery, battery also refusing to work due to a short in system somewhere, I still suspect GPU. Let's see.

[piernov]

Re: Is the GPU shorted? I think yes. What do you think?

2.2. Don't suspect that something is shorted with no reason
Shorted components are not the only failure mode of a laptop. Additionally, some places will measure low resistance to ground under normal operation. In general, high power low voltage (<2V) power rails will measure less than a few hundred ohms to ground. CPU VCore will measure a few ohms only. GPU VCore with newer NVidia GPU can even measure less than 1 ohm. It's normal. If you suspect a short to ground, always report your exact resistance to ground measurements.

Also ESR meter != milliohm meter

[sikocan]

Re: Is the GPU shorted? I think yes. What do you think?

Sorry to waste your time guys, at least I learned that such GPU resistance are normal, that's incredible. The PCH was shorted. After going through all coils and power rails as reported below for future repairers, the 3.3VA resistance was 16 ohms. How obvious. Schematics available on ZinZhiZao.

Video showing the short: https://www.youtube.com/watch?v=jT8jLyJyg8U

Here are readings for the future:
Charger Voltage before plugging in: 19.463V

+VAC_IN 19.463V

CHQ1 - CSD17559Q5 N-CHANNEL MOSFET
SOURCE 19.463V
GATE 0.290
DRAIN 0.372

CHR41 - SHANT RESISTOR 1.245V

CHL1 - +VBAT1 1.251
PWR_BTN1 0V

RESISTANCE VALUES - CABLES ZEROED USING BENCHTOP MULTIMETER

COILS:
FBVDDQ - NVPL5 - 18.8
FBVDDQ - NVPL6 - - 18.8
+V3.3A_EDP - L12 - OL
VX_R - NVUSBL5 - 205
LA_LX - LAL1 - 379
+V5A_TBT3 - L8 - OL
+VBAT1 - CHL1 - OL
+V5A_MPS - SL1 - OL
+V1.0A - V1L1 - 31.30
NVVDD - NVPL4,3,2,1 - 0.25
+VDDQ - ML1 - 35.6
** CONCERN ** +V3.3A_DSW - 3L1 - 17.30
PS_USBC_PD_SW1 - NVUSB_L1 - OL
+VCCIO - IOL1 - 43.5
+VCCGT - IL5 - 7.6
+VCCCORE - IL1,IL2,IL7, - 3.7
+VCCSA - IL6 - 16.7


SUPER IO OHMS - IT8587E/FX
PIN 128 - +V3.3A_EC - 699 OHMS

BIOS CHIP PINS OHMS -
1 OL
2 688
3 745
5 748
6 766
7 OL
8 +V3.3A_SP VCC **CONCERN** 16