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Ремонт ноутбука

Не включается ноутбук

Замена южного моста

Нет видео

Прожарка

Замена видеокарты на ноутбуке

Реболл

зависает ноутбук

виснет ноутбук

не работает зарядка

как восстановить батарею

charger

li-ion

нет изображения

замена видеочипа

lvds

нет картинки

не включается

пост карта

залили ноут

bga

reball

пайка бга

немигающий курсор

как включить без кнопки

нет кнопки

нет реакции на кнопку

не нажимается

как включить

не стартует

00:00:04

[music]

00:00:14

Hello everyone This will be a short video

00:00:16

in which I will tell you how to start a

00:00:18

laptop board if there is no cable with a

00:00:22

power button board on some boards the

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power button is located

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directly on the motherboard itself;

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in most cases it is a

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separate small board with a

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power button and an LED which is a cable

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or it is connected to the

00:00:40

main board using a connector. Sometimes it happens. So

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they bring some kind of board for repair,

00:00:45

for example, to replace a USB connector or

00:00:48

power adapter connector, but they

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forget to bring the cable itself with a plate and a

00:00:55

power button. I usually try to

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check the boards when repairing such things.

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Therefore the question arises of how to start

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the board for many. Probably this is not

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difficult. But if you don’t know how to

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do this if there is no

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power button, then I think this video

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will be useful to you. Let me briefly tell you

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how the power button is organized.

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Let’s draw the S1 button itself.

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on button power button

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one pin of this button

00:01:30

goes to ground the second pin

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can go directly through the decoupling diode

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to the

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multicontroller, let's designate it as

00:01:42

Mio, power is also supplied to the multicontroller,

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usually this is 3.3 V power from the

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LD stabilizer PWM

00:01:52

standby voltage controller, let's designate it as 3 and

00:01:57

3 that

00:01:58

is, turning off the power adapter or when the

00:02:01

battery is inserted at this pin.

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We always have a voltage of 3.3 V.

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When the button is already pressed, the

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power duty station 33 volts

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Power starts and the multi controller is fully

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powered. There are some differences. But

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basically this is what happens so

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in order for the

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leg that is responsible for turning on

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this leg, as a rule, through a resistor, a

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rather high-resistance one is pulled up to the line

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3.3 V typical value - this is in the region of

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100 kΩ, that is, when the button is not

00:02:45

pressed, this is the output which is the output of

00:02:49

the multicontroller which is responsible for

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turning on and off, it is pulled through a

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100 kohm resistor to the 3.3 V line, it should be

00:02:58

noted that microcontrollers,

00:03:01

almost all of them determine the

00:03:05

logical level at their pin according to

00:03:08

some algorithm, that is, in order for

00:03:10

the microcontroller to determine that

00:03:13

there is a high logical level, this does not

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mean that at this pin there should be a

00:03:17

clear supply voltage of 3.3 V.

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Likewise, for a low level, this does not mean

00:03:22

that there should be zero voltage here;

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for each specific case, these are

00:03:28

certain thresholds in the range of which

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the microcontroller considers a high or

00:03:33

low logical level. Well, to make it

00:03:35

clear, let's Let’s draw

00:03:38

four voltage thresholds like this, the upper threshold is

00:03:41

natural for us. Mio supply voltage is

00:03:44

3.3 volts, this threshold Well, let it be

00:03:49

around 2 V. I’m just taking it out of my head now

00:03:52

to make it clear, let this threshold

00:03:55

be 1 V. But let this threshold be will be

00:03:58

zero That is, roughly speaking, this is the

00:04:01

voltage on the ground, so this

00:04:04

voltage range from 2 V to 3.3 V is

00:04:08

considered as a high-high logical

00:04:12

level, this area from zero to

00:04:14

Volt is considered as a low

00:04:16

logical level. That is, if at

00:04:18

this pin there is any voltage in

00:04:20

the range from zero to one, then

00:04:22

the multicontroller will count it as a

00:04:24

logical zero, if there is a voltage of

00:04:26

any from 2 V to 3.3 V, then it will count

00:04:30

this voltage as a logical one and

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there is the same

00:04:34

voltage gap between low and a

00:04:38

high logical level And if this

00:04:43

pin is located But in this

00:04:45

corridor from 1 to 2, then

00:04:48

the multicontroller will not consider this

00:04:51

as a low or high logical

00:04:54

level, that is, the level that

00:04:56

was originally there and it will be

00:05:01

perceived that way. That is, if there was a

00:05:04

zero level at this pin and the

00:05:06

voltage became about one and a half volts, then

00:05:09

the cartoon can

00:05:30

avoid so-called false

00:05:32

alarms because at this pin

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the voltage cannot instantly

00:05:36

set from zero to one or,

00:05:40

on the contrary, drop from one to zero, it may

00:05:42

even have some kind of

00:05:45

noise component, so to speak. which will

00:05:47

depend on the contact of the button itself. That

00:05:49

is, if we draw a voltage on the graph.

00:05:53

Here at this point, then when we

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close the button, the voltage will

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not

00:06:01

drop abruptly from 3 V to 0 V, that is,

00:06:05

instantly it will be with some

00:06:08

delay and it will have a shape like this,

00:06:10

if we look at it, we

00:06:14

can observe this picture,

00:06:17

and if in this case we make a

00:06:20

clear threshold, then at the moment of

00:06:23

crossing the voltage, at this point

00:06:27

we may have

00:06:31

false positives like this, that is, at this

00:06:34

point the multicontroller can count

00:06:36

that our button was pressed several

00:06:38

times

00:06:39

within a short period of time Well,

00:06:42

I think the meaning is clear, I said this

00:06:45

to make it clear that we don’t

00:06:48

have to connect this pin

00:06:51

directly to the ground, we

00:06:53

can do it with the help of this

00:06:55

simple thing The probe that I

00:06:57

talked about in the

00:07:00

keyboard performance tester is just

00:07:03

two needles and between these needles

00:07:06

there is a resistor from 47 km to 10, in

00:07:11

principle, in any of this range such a

00:07:13

tester will work, that is, our

00:07:16

task is to

00:07:18

visually determine on the board which

00:07:21

connection is which Initially, a

00:07:24

cable with a power button was connected and

00:07:27

one needle became the second needle, we

00:07:30

simply pass along all these pins

00:07:33

through a

00:07:35

resistor of this resistance, we will

00:07:38

never burn anything on the board, but

00:07:41

if we get the needle on the contact

00:07:43

that is responsible for turning on, then the board

00:07:45

will go to ground accordingly

00:07:51

You can’t close the pins directly with tweezers because we can get to the

00:07:54

power pin, thereby we

00:08:01

Well, how does this aircraft work? Let me

00:08:07

test it now; the

00:08:10

LED indicator lights up, which

00:08:13

tells us that power has arrived on the board,

00:08:15

and then we, one by one, simply

00:08:18

close these contacts first contact is the

00:08:22

second contact and we see that when the

00:08:24

second contact is closed, the board

00:08:28

starts up. Great trick if you

00:08:31

didn’t know about it, you can safely use it.

00:08:34

I hope it was interesting. Good luck to everyone so far

Description:

Как включить плату ноутбука если нет кнопки включения. Больше видео тут https://dzen.ru/id/5f377551708c8d5df525a586 Набор в группу обучения основам электроники и ремонта. https://vk.com/hamradio1986 Стоимость обучения 1500 руб Для благодарности и поддержки канала: карта Сбер 639002529037338341 Перевод по номеру мобильного 8-928-7610692

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