Download "Поиск короткого замыкания. Как найти КЗ на плате."

"videoThumbnail Поиск короткого замыкания. Как найти КЗ на плате.

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ремонт ноутбука

поиск КЗ

поиск короткого замыкания

как найти КЗ

как найти короткое замыкание

лабораторный БП

лабораторный блок питания

найти КЗ на плате

найти короткое замыкания на плате

битый конденсатор

конденсатор в КЗ

керамический конденсатор

найти битый элемент

починить плату

ремонт платы

00:00:01

Hello everyone, today we will show a short

00:00:03

video about how to correctly find a short

00:00:05

circuit on a laptop motherboard.

00:00:07

This video will be used as a supplement to the

00:00:10

fact that we have already made a video about

00:00:13

finding a short circuit where we

00:00:15

used lithium-ion batteries of the

00:00:17

18650 format and we talked about the fact that

00:00:21

this method is not correct,

00:00:24

of course it is fast but incorrect,

00:00:26

and now we will use these batteries on our

00:00:28

side, and in

00:00:30

this video we will use a

00:00:33

laboratory power supply, a

00:00:35

multimeter, of course, and a fax paper,

00:00:38

then I will show you why,

00:00:40

first of all, we will make sure that it is the

00:00:43

mother’s dress short circuit,

00:00:45

turn on the multimeter in

00:00:48

resistance test mode and

00:00:53

measure

00:00:54

19 stroke 19 in 19v of this line on the board

00:01:00

on the main

00:01:03

resistors

00:01:05

as you can see 2 ohms short circuit and

00:01:08

now we will try to find where but is

00:01:11

located last time this is the same

00:01:13

dress with the help of batteries we found a

00:01:17

short circuit here in this area in

00:01:19

this resistor

00:01:21

capacitor, I beg your pardon, let's see

00:01:23

where it is now now

00:01:30

in this video we will use a

00:01:31

laboratory power supply in order

00:01:33

not to harm the motherboard in

00:01:35

the process of searching for a short circuit, as

00:01:37

legions could do, the battery from the

00:01:40

previous video, for this we turn on our

00:01:44

laboratory unit power supply and

00:01:46

set the maximum current to start with 1

00:01:49

ampere, let's

00:01:53

start with this current and I think that

00:01:57

this is enough to slightly

00:01:59

warm up the area where the

00:02:01

short circuit is located on the board and then we

00:02:04

localize the

00:02:06

element itself, cool as in a short circuit,

00:02:09

now we connect the

00:02:13

negative

00:02:15

probe to To do this, we will

00:02:19

use a small fastening

00:02:21

device on the motherboard

00:02:26

using a screw bolt,

00:02:30

we connect the minus, we pay like

00:02:43

this,

00:02:47

now

00:02:50

we switch the power supply to current measurement mode

00:02:52

and

00:02:55

connect the

00:02:57

positive terminal

00:03:00

to one 19 volt resistor,

00:03:03

which we are told to pay for, a

00:03:13

spark has slipped through,

00:03:15

now

00:03:19

we begin to tactilely feel where the

00:03:23

heated one is located area on the board last time

00:03:25

we found short circuits here

00:03:29

everything is fine there is no short circuit

00:03:31

here we go further and

00:03:39

so in this area now I

00:03:43

feel a slight temperature

00:03:46

until this is where the

00:03:49

short circuit is now

00:03:50

we will now give a little more current to

00:03:54

make sure of this finally

00:03:56

and find exactly which

00:03:58

capacitor. Now, in a short circuit,

00:04:03

we connect the terminal and

00:04:05

now we set the

00:04:08

current to

00:04:10

2 amperes. We

00:04:27

also connect the positive contact of the

00:04:31

dress

00:04:37

and the temperature has increased.

00:04:40

Now we need to calculate which

00:04:43

of these capacitors there are 4 of them and it’s as

00:04:46

if they are all heating up now, as I

00:04:49

said in At the beginning of this video, we will

00:04:51

also use the fact that owl paper

00:04:53

has a certain property, it

00:04:57

can

00:04:59

darken at temperature, that is, in this way, and

00:05:03

all these fax machines print on

00:05:05

this paper without using ink, in the same way, by

00:05:07

now leaning this check on the

00:05:10

area where the

00:05:12

spilled area is located, we will now find which

00:05:15

specific element has gone short

00:05:18

circuit and so we lean

00:05:22

our paper into the area where we supposedly

00:05:27

found a short circuit and

00:05:32

connect the positive probe again,

00:05:36

wait until everything warms up,

00:05:50

look at the

00:05:52

imprint on the paper, you can see that where the pressure was the

00:05:56

strongest, here is the imprint of two

00:06:01

capacitors,

00:06:05

one of them has darkened, that is, exactly It is

00:06:08

in this that the short circuit heats up.

00:06:11

Now we will desolder it

00:06:13

and check whether

00:06:14

it is desoldering correctly.

00:06:23

Judging by the imprint on the receipt, we will

00:06:43

desolder our capacitor and

00:06:47

use a hair dryer

00:07:21

and now check with a multimeter

00:07:27

whether it is really the culprit of the short

00:07:30

circuit,

00:07:41

yes, as you can see in That was the problem,

00:07:46

now we need to solder a capacitor with the same

00:07:49

parameters,

00:07:51

what exactly are the parameters of

00:07:53

the capacitor we can see in the diagram it is

00:07:55

indicated that this particular

00:07:57

capacitor

00:07:59

is 10 microfarad for twenty-

00:08:02

five volts,

00:08:04

we can find exactly the same capacitor

00:08:06

on the donor board and

00:08:09

solder it to the place of the failed one is

00:08:23

here on the donor board there are the

00:08:25

same capacitors and we will

00:08:28

now simply replace one of them in place,

00:08:52

add a few pluses so that everything is

00:08:54

soldered normally, the

00:09:07

entire capacitor is soldered, now

00:09:10

we check that the leakage has been lost on the board,

00:09:15

we check the short circuit condition

00:09:18

after replacing the capacitor,

00:09:22

we connect the probes

00:09:26

to input 19 in your line and

00:09:29

as you can see there is

00:09:31

no short circuit

00:09:35

now we just have to turn on the

00:09:38

motherboard and make sure that the

00:09:41

repair is completely

00:11:28

connected to the matrix of the motherboard

00:12:15

including the motherboard

00:12:24

as you can see the laptop is working and now

00:12:30

we can safely say that the repair is

00:12:32

completed

00:12:33

thank you all for watching I hope it was

00:12:36

interesting and useful all the best

Description:

В этом видео показано каким образом можно найти КЗ на плате с помощью лабораторного БП. В одном из наших видео, мы показали способ поиска короткого замыкания с помощью литиевых аккумулятором, однако тот метод опасен для платы при неумелом обращении, потому и было решено показать, каким образом легко и безопасно найти КЗ на плате с помощью регулируемого источника тока. Подробности в видео. Лайк и подписка на канал приветствуются, они повышают наш моральный дух :) Подписка на канал: https://www.youtube.com/user/1servicecore?sub_confirmation=1 Сайт нашего сервисного центра: https://service-core.com.ua/

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