No ideas?
I tried another (known good) CPU and also the thing is still very much dead.
Also tried plugging in the ethernet cable, and the card is alive (was thinking it could have been damaged by lightning strike). So it is not that.
I discovered something called a Libreboot BIOS, and it also exists for T530.
Don't know much about how it actually works, but I was looking for a bin file(s) that I could flash and try that one, but you need to compile it yourself.
Does anyone have more info how to do it, or already has a premade image for T530, that I could...
mitchw
Senior Member
Last Activity: 07-07-2026, 07:19 PM
Joined: 12-01-2016
Location: Ljubljana
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If the output inductor (choke) is shorted internally, there could also be hissing and some sound emitted.
Once had a MacBook board with the similar thing, it was working, but there was always an annoying buzz. Culprit was partially shorted output inductor on PP3V42_G3H line. If I remember correctly, the output voltage wasn't exactly spot on too, but a tad low.
Capacitors could also produce annoying sounds, especially ceramic caps.
Chip shouldn't do this on its own, at least I think so.Leave a comment:
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Lenovo ThinkPad T530 (LKN-4 UMA MB 11223-3 Mainboard) - Brain dead / no image
Hello,
I've been trying to repair this old T530 laptop. It is in really good condition, with no almost signs of use.
However it is dead. There was no prior information provided, how it died, or so. The board is extremely clean, there is no dust inside, etc.
It does power on and it charges the battery. However the display stays black, also the USB devices (like a mouse) don't initialize or power on - that means it is essentially brain dead.
Fan spins for about 4-5 seconds, then stops. The CPU will get really hot eventually, but the fan will not spin up, nor... -
One more thing, if the fuse blew like you are saying, then it would open up - became an open circuit, and the hall sensor would just stopped working completely.
In this case, the fuse actually degraded / failed, as it was still allowing current through - resistance went up to 20K or so. Blown fuses don't do this. If the fuse was really blown, I would measure 0V on the other side, not the 2.8V. This looks much more like thermal degradation than a clean overcurrent event.
The fuse just fails because it gets cooked by the heat. It is never a good thing to put a fuse on part of...Leave a comment:
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The best way to solve the argument about the fuse rating, would be to check the schematics, which I doubt they exist for this model, at least for now.
If someone has them (or for some other Victus 16 / Omen 16 laptops - even with Intel CPUs), let me know, would love to check the FU6 rating.
However, I have never seen such a low current fuse you are describing on a laptop mainboard. They do exist, though.
I still do think that the hall sensor is fine, as the broken fuse was reading about 20k ohms, which caused for the voltage to drop to about 2.5V-ish, which means the hall...Leave a comment:
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Anyways,
I think I found the real culprit. The Hall sensor turned out not to be the root cause.
Firstly, the sensor is powered by 3V, not by 1.8V. That was confirmed by measuring the pins on the JIR1 connector going to the IR/Hall sensor board. The output pin is also at 3V, that goes to 0V when hall sensor is triggered.
But when I measured pins on my laptop, I found one quirk. The VCC was 2.8V, then slowly going down to about 2.2V, and jumping all around. Something that should not be happening.
I then stumbled across a forum post that said, check the FU6...Leave a comment:
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I got the reply from the customer, it can wait till next week.
So I will be ordering a TMAG5131-Q1.
Which one should I select? They all differ in Operating Point Min/Max and Release Point Min/Max (Brp).
If I get one that needs a stronger magnetic field, then it might not work. But if I get one that is too sensitive, it might trigger on its own.
Anyways, I found the specs for the original TCS40DLR sensor, they have them listed on Mouser:
Operating Point Min/Max: 3.4 mT
Release Point Min/Max (Brp): 2 mT​
So the closest...Leave a comment:
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Will try to find a schematic, I hope it is available at all as the machine is almost new.
I was referring to this post: https://www.reddit.com/r/HPVictus/co...thread_laptop/
I would think that a device using 1.8VCC will also output 1.8V GPIO signal, and 3.3VCC will output 3.3V signal... makes sense.Leave a comment:
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HP Victus 16 Hall Effect Sensor Problem
I am repairing a HP Victus 16 with black screen, blinking screen, etc. Quick googling provided me the answer that the lid detect hall sensor is the issue. Confirmed with disconnecting the IR board (that contains also the hall effect sensor). Laptop itself is just over a year old, but out of warranty.
Apparently the sensor itself is a TCS40DLR, which fails after just months of use at elevated temperatures.
Now which one is the best to replace with?
Some suggested A1126LLHLT-T, but they had to modify the power supply to supply the 3.3V instead of 1.8V, as the sensor wasn't... -
Disconnect the IR board (tiny connector on top center of the board), and see if it is any better... that board fails and causes the laptop to do all weird stuffLeave a comment:
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Fixed!
UT340 level shifter was bad and also the DZT400 zener diode. The output (IPD_MCU_INT_CONN_L) connects to the 1st pin of the JT400 (trackpad connector), and when I was initially checking the 1st pin, and it being grounded, I assumed it is what it is, because lots of times the 1st pin on the connector itself is ground. In fact, it connects to the UT340 and DZT400. The zener was shorted to ground, and the UT340 was reading O/L on the diode check. Most likely a careless technician caused this problem.
After replacing both components, putting everything back together, I was...Leave a comment:
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Will do. From what I've seen the level shifters for the keyboard/trackpad SPI are mostly the same on M3 MacBook Pro 14.
Anyways I managed to "brick" the system, I tried doing the DFU and it failed mid process. Now I only get the dreaded exclamation mark.
I tried to do the DFU multiple times and from 2 different machines, both fail with same error: (7) 130C.FFFF
My guess is that this means that it failed because of the missing trackpad. Interestingly it also failed before, but almost at the beginning, so it didn't do anything. Last messages in the updater log...Leave a comment:
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I made some progress, I updated to the latest MacOS 26 Tahoe and it immediately prompted me to calibrate the Lid Angle Sensor. I did the configuration and now the Lid Angle Sensor is working. So apparently it was fine, just not calibrated.
But trackpad/keyboard are still not functional. Diagnostics say that the trackpad is not compatible with this model, despite being the right one. So I am guessing there might be more SPI problems. I perhaps could try doing the DFU restore, but the last time I tried, it failed due to trackpad being not connected (it was, but not detected)...Leave a comment:
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I decided to check SPI and I found the computer does not detect any SPI devices (it should detect trackpad and keyboard).
Next I again remeasured the Lid Angle Sensor voltages and found 2 voltages missing:
- SPI_AOP_LAS_MOSI_1V8 (0V)
- SPI_AOP_LAS_MISO_1V8_R (0V)
Other voltages are present, as well as SPI_AOP_LAS_CLK_1V8 which is at 1.8V
As the schematics are not available I can't trace them.Leave a comment:
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Still looking for the schematics, on my board there is a problem with SPI circuit, but it looks they changed it completely (different level shifters) compared to the M3 Pro board.Leave a comment:
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I replaced the trackpad with a new original Apple part and it is still not working :/
I still have to replace the angle lid sensor but I am not sure if will cause the trackpad/keyboard not to be functional
I am bit lost on this one.Leave a comment:
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Sure, no problem.
Sadly I didn't fix it, but I am almost certain that the board is not at fault.
It works, but I have no keyboard / trackpad... Also lid sensor doesn't work but I think this a separate issue.
Until I replace the trackpad and lid sensor with known good units, I can't be sure abut the logic board.Leave a comment:
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It is 820-03400-A.
The M3 Pro board (820-02918) is similar, but has quite a few differences. I wasn't able to help with it much......Leave a comment:
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Ok!
I checked. Keyboard and trackpad cables are both fine....Leave a comment:
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Also forgot to add, but running the diagnostics throw following errors:
NDR008 NDK001Leave a comment:
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