Thank you!

Thank you!

Yes, that is what it is referred to. The chip responsible for the 3.3V will have that designation on that voltage rail running to the EC and the power button. It's not a pull up chip, has 19.5V in and Batt In. One pin is 3.3V AON

@BasicComputerRepair Pull-up is referring to the resistor on the logic line that is connected to logic high voltage (in this case 3.3V). When that I/O pin with the resistor to 3V3 is connected to ground, we call that "pulling it low". What happens, is that the resistor to 3V3 limits the current you can draw on that short to ground, effectively causing it to go to 0V without actually shorting the 3V3 to GND. The signal is considered "triggered" when the signal is pulled to a "low" voltage potential. The opposite is possible as well, with a resistor going to ground and your signaling connecting it to a higher voltage. That's called a pull-down. The signal is considered "triggered" when the signal is pulled to a "high" voltage potential. Both of these ways of signaling are referred to as active low with a pull-up resistor, and active high with a pull-down resistor. "LDO" does indeed refer to "Low Drop Out", as @interpleb1675 has alluded to. The 'drop out' part of that abbreviation wouldn't make sense in the context of a logic level signaling line. The 'drop out' refers to -- roughly -- a property that describes when a device stops working. In the case of an LDO *regulator*, that means the regulator has a very small amount of difference it needs between the input and output before it cannot keep the voltage at the specified output level. @BasicComputerRepair Can you clarify who taught you or where you learnt about logic low signals being called LDO? I'm curious to see where the misconception comes from, even if it's possible a widespread misused word. To give you an example or reference point: take the datasheet for the SMSC LPC47N217, which is widely available. Pins and signals there are referred to as "active low" or "active high". Some of these pins will have internal pull-up or pull-down resistors. The same terminology is used in the venerable STM32F103's datasheet, a well known and ubiquitous microcontroller. These even have configurable internal pull-ups!

@@AnnaVannieuwenhuyse Thank you for your very detailed explanation. My channel is for beginners. I don't plan on going into that kind of detail within a year or more. The point was just to show how a computer turns on, it's main components, and a follow up video on diagnosing a problem with the 3.3V AON line. You are obviously a trained technician. LDO is common phrase terminology for the linear always on 3.3V for startup, and yes, probably should not be used. My formal training is from a Technical institute in the mid-2000's.

@@BasicComputerRepairUtilizing inaccurate terminology within educational contexts is inappropriate. Many individuals resort to translating complex concepts into everyday language for effective teaching, whereas using technical jargon only serves to confuse.

@@TransRightsMatter The data sheets put out by major manufacturers, such as Texas Instruments, use this same terminology with regard to the linear 3.3V AON on computers and many devices for start up.

Most computers, especially non-Apple, don't have that information available. Apple does because people pay a lot of money for reverse engineering or smuggled out schems and boardview. You can find it with the continuity on your multimeter. Thanks for watching!

I had pre tested the points. That wasn't a guess. Found them via continuity to the power button. Both of the components I touched were correct. But that was not the point. The point was to show the purpose of the power button. But, the same can be accomplished at multiple points around the EC. Perhaps I implied I was guessing and searching for the right component. However, when a computer is not turned on, shorting anything to ground around the EC other than the 3.3V LDO will do nothing. It would be just as if the power disconnected. If you can show a component around the EC, or even a pin on the EC itself that causes any harm, I will concede and make corrections to the video. Until then, the video stands and I stand by it. You are obviously a technician and of course a person needs to know what they are doing and not just poking around such an important chip. But to ground will cause no problem. Now, the BQ chip, that's a different story. That's why I did not short there as a slip can blow the BQ and cause damage elsewhere.

@@BasicComputerRepairAs I said this is a bad example of practice especially for someone who is now starting with electronics and more specifically repairs. You could have done the same using a probe with a very thin needle and not the alligator clip stating that this is a task that requires some attention and precision. As for your request, you know that EC has direct data lines with PCH. I don't know the layout of this specific board (I would need to know the P/N of the board and a boardview) but shorting these line with 3.3V could cause permanent damage to the PCH and the end of life for this board. Again, I'm not saying you don't know what you do, I say that someone rookie watching this video may come to the conclusion that poking around with an alligator clip in a board is completely safe.

@@nikolaskallianiotis8622 I was shorting with GROUND, OV, not 3.3V. Even if I touched the alligator clip to a 3.3V point and a data line simultaneously, the other end of the clip was ground, which would have shorted noth the 3.3V and data to 0V. Your point is understandable. Alligator clips rather than a sharp point is a bad choice, but I clearly showed the other end was secured at ground.

If I understand you, yes you are correct. I pre selected the point I used to short it. I was not searching. Yes, there are other voltages coming from the BQ chip, but only the 3.3V LDO shorted to ground will turn it on.

No, you do not need a schematic of the EC. You can find the pins with continuity setting on multimeter to power button.

@@BasicComputerRepair Thank you for such a quick response and for clarifying things I was confused about. In case of the motherboard that you are using for this video it is indeed simpler to just use the pins for the power button but I expect that the connector for the power button might not always be as straightforward to find or use it. In this case I could search for the pin number of the ON/OFF pin in the datasheet and short it somewhere close to EC chip. That is not possible if the EC chip is BGA, though. My takeaway from your video is that in the worst case, I can can just blindly look at various components around the KBC for 3.3V and short them into ground hoping that one of them will be the power button pin, correct? Maybe I should use some small resistor so that I do not do a real short, though? In any case, thank you for the video, looking forward for more content :)

@@krzysztofadamski7804 You are obviously a technician. Actually, shorting anything to ground will cause no harm. It would be just as if the power were turned off. I will eventually get to data sheets, schematics and boardviews, but this channel is for absolute beginners. Just wanted to show the concept of how a computer turns on via shorting the LDO to ground. I will eventually get to much greater detail. Thanks for your comments and your views!

@@BasicComputerRepair I'm not a technician but I think it's fair to say I'm not complete beginner. Since you say you are a hobbyst in some of your videos yourself, you know that people interested in those topics may have different (probably sometimes even unexpected) background. I just happen to have some background (mostly self taught, as a hobby too) in electronics so I may know a little more than some other beginners but I never considered repairing a laptop motherboard myself before :)

You just gave me an idea for a video. Yes, my terminology was for people that know a little bit. Thanks for your input!

I also notice you are subscribed to some really good channels. For someone at the absolute beginning, the best channel you are subscribed to to is AdamIT and mine. His early videos are great for a beginner. You can literally start from #1 on his playlist. He's been in the KZfaq business much longer than I so his stuff is organized better.

@@BasicComputerRepair So sir I hope the idea is you will make new beginners videos for me and my newbies😅. And am sure am not the only one here with no knowledge of laptop repair but have the passion of having one I did watch the whole videos while I had no idea what and why u are creating shortage but it was fun for me cuz I imagine my self being an expert like you solving such problem

@@BasicComputerRepair yes sir I have but all of them are in the advanced level vibe none is on my level.