I tried to inject some volateg into PL8 to find the short but couldn't find any component heating up, upped the current to 2,7A and I was able to figure out the area that's getting hot.
Unfortunately, it is around the lower left corner of the die :-(
I attach a picture of my IR cam.
I have no experience with dead CPUs but from what I saw in a couple of videos, this is what it looks like, although I am open to other opinions...
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Yes, I have an IR camera to spot hotspots.
When I attach the charger (without battery) I get 20V, 9V, 5V, 3,3V and 0,9V (which should be 0,75V VDDP_P if I'm not wrong). I do not get 1,2V.
I measure at PL7 and get 0,9V while the CPU and PU4 are heating up quickly. If i disconnect the charger, PL7 is shorted to ground with 0,6ohm.
I desoldered PJ8 to check which side if shorted to ground and you are right, PU4 seems to be fine, part of PJ8 going to PU4 is not shorted it's about 100 Ohm.
The other side of PJ8 leading to Q22 is short. I injected 0,75V to that side and voltage...
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What i meant to say is that the CPU gets hot as soon as the charger is connected. no need to press power button, it gets hot right away (no battery is attached, only running on charger)
With regards to the power rails:
VDDCR_SOC_PH1: 0,9 ohm
VDDCR_CPU_PH1: 3,6 ohm
VDDCR_CPU_PH2: 3,6 ohm
VDDCR_CPU_PH3: 3,6 ohm​
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I dug a littler deeper and found that VCC on the EC is missing, which is +3VS according to the schematics.
In fact all the VS lines are missing: +3VS, +5VS, +1,8VS and +0.75VDDP are not present while the ALW equivalents are there
As i see it, the mosfets controling the gate for these lines (Q30 and Q24) work, SUSP is created (5,1V) and V9B+ is also there.
Can it really be that both fets are gone?...
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Thinkpad E14 Gen 2 NM-C771 - No display no fan no beep no boot
Hi there,
I got this laptop which was not working at all. When attached to an amp-meter, the meter wasn't working at all also. I quickly found out that the PD-Power switch was gone and fully shorting to ground. After replacing that (NX20P5090) I got live back into the laptop.
Now the battery is charging, charge indicator is working and the power led is blinking 3 times when i attach a charger. but, unfortunately, this is it. When i push the power-button, the power led turns on, but that's it. No display, no beep, no fan spin, nothing (but cpu gets warm).
I tried flashing a new...
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Thanks for thee swift feedback guys.
[USER="13654"]bill[/USER] I checked PC715 and I indeed have 8,6v there with the charger attached. And i don't have any additional light, neither power button nor caps lock light up.
I also tried to start it with keeping the charger on for longer, as you suggested. Unfortunately, no success. As I#m not sure if the laptop even starts without a battery, I'll take small steps and get a working battery first. Maybe that will already fix the issue.
I'll come back once i have a battery and know some more details.
Thanks so far...
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Dell Latitude 7420 - Status LED blinks white once
Hi Guys
I have a Dell Latitude 7420 here which doesn't want to boot.
If i plug in a charger, the status LED blinks white once only, nothing more, no amber blinks.
I'm trying to start it without battery as the old one inflated and had to come out.
I've tried all kinds of startmethod, holding D, holding CRTL+ESC, holding M+power, nothing works. I've even checked voltage/current consumption: charger changes to 20V and 0,07A but despite the one white blink, nothing else happens.
Does someone have an idea what i should look at / check?
Thanks
ongobongo
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Re: ps5 disc, white light, no display
Check the filters again, this time for cross-shorts. Maybe there is an issue.
If not, check the rest of the HDMI-circuit. I once had a PS4 Pro with the exact same problem. The problem was a blown resistor connected to Pin 18 (don't remember exactly which Pin it was.
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RX 5700 XT shorted power rails
I just received a non working Powercolor RX5700XT Red Devil which I'm trying to repair.
Card does nothing so I dissasembled it and tested for rails.
12V is fine, as well as 5V and 3,3v.
Problem is that 1,8V and 0,75V both dead short to ground (and to each other).
I tried injecting 0,75V into the rails, but the only spot that is lightly glowing, although set to 3A, is a little spot on the edge of the APU-die.
Am I right in assuming that the APU is dead and the card is for donors or did I miss anything?
Thanks
Ongo
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Radeon RX 6700 XT chrash while driver install, memory PWM-Driver?
Hi guys,
I have a new project, a PowerColor RX6700XT GPU which starts up fine but crashes as soon as some load comes up, the driver install is enough for this. The install won't succeed and the card crashes with ramping fans.
What I figured out so far:
As the card starts up, all voltages are there.
The core rails seem to work fine, all of them run at 500KHz (measured with a normal multimeter as I don't have an oszilloskop at hand).
That said, I think I have a problem with one of the memory rails. The top two drMOS on the right side (see picture) power the memory....Last edited by ongobongo; 09-15-2023, 01:47 PM.
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Powercolor RX6700XT Red Devil Schematic needed
Hi all,
does anyone have the schematics for the Powercolor RX6700XT graphics card or any other RX6700XT?
Thanks
Ongobongo
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Re: RTX2060/NCP81611 Issue
Thanks for the answer.
I just managed to fix the issue on my card.
I'm not very experienced when it comes to GPU repair, in fact, this is my very first attempt.
During fault search I took of the NCP and the PWM controller as well.
After finding and fixing the main problem - a tiny cap went bad - I put the two chips back. After that the strange behavior appeared.
Yesterday evening I took some time, re-seated both QFN-chips and touched up all connections to the pads.
After that, the problem went...
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Re: RTX2060/NCP81611 Issue
were you able to fix your strange booting problem?
I have the exact same problem with a Gigabyte RTX-2060 i've just fixed.
I had a shorted capacitor at 5V rail and after fixing that the card worked, but only when doing a reset after powering it up.
Cheers
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Microsoft Surface Go 2/3 schemactics needes
Hi guys,
I need the schmematics of Microsoft Surface Go 2 or 3, model number 1901.
Boards of both versions should be the same, just a difference in CPU/RAM/SSD config.
Type is: DAV81MBBAA1 Rev. A
Thanks a lot
OngobongoLast edited by ongobongo; 08-26-2023, 09:18 AM.
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