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компьютер

блок питания

ATX

ремонт

не работает

не включается

LC-B360ATX

PS_ON

+5VSB

нет дежурного

LC-B350ATX

Конденсатор

00:00:00

hello, I hope that this video

00:00:03

will be included in the general knowledge base for

00:00:05

repairing computer power supplies,

00:00:07

such insidious malfunctions as a

00:00:10

faulty resistance of 1 megohm,

00:00:13

repair of a switching power supply from a

00:00:16

computer, repairs should only be carried out by

00:00:19

craftsmen who have a

00:00:22

high-voltage approval, qualifications,

00:00:24

tolerances cannot be made without

00:00:29

high-voltage approval and in at

00:00:31

home, this is life-threatening,

00:00:33

but now let’s talk about this problem, which is quite

00:00:36

difficult to find but easy to

00:00:39

troubleshoot, why the

00:00:40

power supply did not work, the power supply is like this,

00:00:45

model RCB 360 e x, a good silent

00:00:52

power supply with a bottom-mounted

00:00:54

fan, powerful enough, I can get it

00:00:57

for a simple computer ok

00:00:59

I spent on it, to be honest, about

00:01:02

two weeks,

00:01:03

that is, I sat down 67 times trying

00:01:07

to fix it, it’s

00:01:08

easy to find, I think everything is easy, it’s not heavy

00:01:11

enough to find it, there was a malfunction,

00:01:13

especially since I didn’t see it and

00:01:16

show it on video, I filmed it, but it

00:01:17

will take a long time What was the situation? We unplug

00:01:20

the plug and there is a little dust without the

00:01:22

power plugs being connected; these

00:01:24

plugs are connected; we plug it back in; it turns on

00:01:27

again; the computer works without problems;

00:01:30

everything goes fine; we turned off all the

00:01:33

legacy;

00:01:40

think,

00:01:42

sorting it out, when it became already I

00:01:44

got it to very, very still, I still

00:01:46

turned it off, I’m removing these two

00:01:51

input capacitors, as far as you know,

00:01:53

they should be 680 microfarads in this

00:01:57

power supply, it’s powerful enough,

00:02:00

so I measure powerful capacitors

00:02:02

440 microfarads

00:02:09

should be 680 and 2,470 microfarads, although it

00:02:20

should be 680,

00:02:22

well, I think it’s nonsense what the purpose

00:02:24

of capacitors is now, these capacitors are out of

00:02:26

phase, now I’ll change everything, I went bought

00:02:28

this capacitor, I installed it, I turned on the

00:02:30

same thing, no changes, okay,

00:02:35

but naturally, when I checked these, I

00:02:37

checked all the others capacitors, that is, well,

00:02:40

if you buy new ones, move in,

00:02:42

checked all of them, everything is in perfect condition,

00:02:44

all small, large,

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any capacitors here, everything is in good

00:02:49

condition, perfect, except for these two,

00:02:51

they were a little worn out, I changed them, but I

00:02:53

didn’t change those, they are good, I launched

00:02:57

nothing, well, of course, then I check

00:02:59

all the diodes,

00:03:00

transistors, I was afraid that

00:03:04

maybe this is some kind of floating

00:03:05

fault, this happens in transistors

00:03:07

in zener diodes, that is, with

00:03:09

all devices it shows and is good, but during

00:03:12

operation there are malfunctions,

00:03:14

they are very difficult to diagnose only

00:03:17

by replacing you with devices and it is

00:03:19

impossible to identify it in any other way I thought that

00:03:22

maybe this is all I already checked the

00:03:25

ceramics, checked everything, even ordered

00:03:27

another Chinese device, these are the

00:03:29

ones with the pads with the button and 100 meter, they were

00:03:33

trying for the sake of it, I think that this one

00:03:36

I have at least only the capacity, although everything is accurate,

00:03:38

but it doesn’t measure the leakage to the initiator I think

00:03:40

maybe it’s something that I ordered a

00:03:42

device here for 500 rubles while still on the road, well,

00:03:45

okay, I think I decided to spend two weeks

00:03:49

just as a

00:03:51

principle, what could happen here next,

00:03:55

a destin pump, I

00:03:57

remove the tin from everyone, the fact that there are transistors on the radiator,

00:04:03

by the way, a power supply

00:04:06

five-volt combat duty 3150

00:04:10

control chips

00:04:14

lm 339 n and 7500 b standard

00:04:20

power supply removed the radiators with suction removed from the

00:04:25

donkey there I didn’t get the cars all at once

00:04:27

because it’s simply unrealistic to unscrew them like that

00:04:29

okay once again I’m starting to

00:04:33

ring ringing ringing

00:04:35

everything is fine I can’t understand each one I

00:04:37

already checked the spare part, everything was fine, I decided

00:04:41

to warm it up, I think I warmed up the soldering iron, I

00:04:43

went through some more, and I warmed up all the points

00:04:46

again, assembling everything, inserted back, they will give birth with

00:04:49

tendencies, I’m assembling everything, it doesn’t start at all,

00:04:51

that is, there’s no start at all

00:04:54

again, and now I’ve taken everything off again, I’m starting to

00:04:57

check it, and in the end I finally stumbled upon it I’m looking

00:05:01

at this here at this resistance at

00:05:05

this resistor

00:05:06

don’t look at it, it’s a little bit

00:05:07

from someone I cleaned it here so

00:05:10

black it was filled with like varnish or

00:05:12

something it was all covered with varnish next

00:05:14

to it there were five-volt workers on

00:05:17

duty duty 30 and 50, here it was also covered in this

00:05:21

varnish, I almost cleaned it to understand its

00:05:24

resistance, the

00:05:25

thing is that earlier when I checked the

00:05:28

measurements there was resistance on it, that is,

00:05:30

the power supply turned on, it was working, it

00:05:32

was impossible to catch the moment when it is

00:05:34

not working in order to fix it

00:05:37

there were interruptions in this resistance, I

00:05:40

assume this is the resistance according to the

00:05:42

scheme 1 m oh 1 com apologizing very

00:05:45

much 1 mole here is 1 mohm of resistance

00:05:49

with the tester now it’s when the tester

00:05:53

stopped running into the power supply

00:05:55

this resistance stopped

00:05:58

ringing to feed warmed up his brains she

00:06:02

compressed and so where is she giving us water

00:06:04

on

00:06:05

here she put it on 1 mohm troops 200 here

00:06:09

let's put on 20 mohm it shows

00:06:14

319

00:06:15

but it runs through the mobs according to the scheme I'll

00:06:18

remind you of this moms goes in the opposite

00:06:22

direction we swap the probes does

00:06:24

n't show anything at all I put it on

00:06:28

200 he could also but this Mom shows

00:06:36

23, this is according to the diagram somewhere nearby

00:06:38

because mom is very strong,

00:06:39

just like that, just

00:06:41

touch it with your finger so that there are already some readings,

00:06:44

it’s a very strong resistance of 1

00:06:47

ohm, but it’s not there, I assume that

00:06:50

this was the reason

00:06:52

I spent a lot I have time, I’m

00:06:55

sorry for distracting you now, it’s your time, I don’t

00:06:57

know, it helps someone, someone doesn’t, but

00:06:59

if you have a problem with the fact that everything

00:07:03

wasn’t checked as it was, it’s not clear what I

00:07:05

checked and these resistances are voltage pass-throughs

00:07:07

that are here, here

00:07:10

they are there are such

00:07:12

large species here, but it’s not clear that all this

00:07:15

was checked, the voltage was measured, everything was

00:07:17

always normal,

00:07:18

but here it is right here, it’s worth a battle of 30 and

00:07:23

50 next to it, this is it, let me

00:07:27

take it off, let’s take a closer look at it,

00:07:29

if I’m sorry, I forgot to show what it is

00:07:32

board board b7 231 dash 450 s it has a tx

00:07:37

in 2 and 6 version 2 to solve this

00:07:41

resistance is quite small, it’s difficult to

00:07:44

remove it for me to show it so that it’s like

00:07:46

here which stop goes by color

00:07:49

brown black black yellow

00:07:51

brown or vice versa brown

00:07:54

yellow black black brown it’s clear

00:07:57

that the near edge should be the beginning, but

00:08:00

where here it’s not very clear that

00:08:03

its appearance is not very good, it

00:08:06

was filled with factory varnish when it already refused,

00:08:10

then I started measuring it, cleaned it,

00:08:12

looked at the resistance, then there

00:08:13

was a little bit of it on the scale, but it refused

00:08:16

after warming up,

00:08:17

that is he didn’t pose for long, the brains

00:08:19

worked, then didn’t work, here’s the power,

00:08:21

they started up, didn’t start up, it’s not

00:08:23

burnt, it’s

00:08:24

just such a dark factory varnish, so

00:08:29

now we’ll look at the pinout, what is it

00:08:32

in our dacha, the computer is

00:08:35

right next to us, we can open the chip and dip like

00:08:39

this Well, what do we have brown if we take

00:08:45

black black yellow and brown one

00:08:51

of the options we get 1 mole

00:08:53

everything is good because if we let it go like

00:08:57

this let’s take brown yellow black

00:09:01

black brown then we get 140 am

00:09:03

but of course most likely like this

00:09:07

because I practically have the diagram I found a

00:09:12

similar circuit of the power supply on the bayou

00:09:18

3150, 5 volt power supply on duty, that's

00:09:23

the principle, technically everything fits the

00:09:24

parameters everything fits, but here

00:09:26

from ours we need the resistance that we need here it is here here

00:09:30

it consists of two

00:09:32

consists of 2 2 2 pieces, one of mine we have

00:09:36

costs 1 megohm that is 1 mole what according to the

00:09:43

diagram here they are r 500 r 502 according to this

00:09:49

circuit on the board

00:09:50

this is the resistance r 503 here is an empty

00:09:56

space here

00:09:59

the camera will focus here r500 3 here it was

00:10:04

standing here ships I’ll go now to a

00:10:07

special one I’ll go buy 1 I’ll put

00:10:09

up enough resistance for two

00:10:14

weeks already, we didn’t bother with trifles, I decided to

00:10:19

go all out and bought 100 on

00:10:24

the 25th, then as many as 5 pieces of one ruble for 5

00:10:27

rubles and 11 for you about cotton wool 5 pieces for 2 rubles, do we

00:10:32

act in the end for 15 rubles

00:10:37

yes, these are the prices that are normal in stores,

00:10:39

well, here are 11 mothers, I took 0 5 watts,

00:10:46

but for 25 the pinout for 025 is

00:10:53

brown black green golden, this is

00:10:57

one could, this cut goes by color,

00:11:01

brown brown green golden,

00:11:03

this is 11 ohm mother, but I’m measuring here this one,

00:11:09

these ones, which should be the same by color, they

00:11:11

could have one for some reason, 906 com, that is,

00:11:15

I try them all, they all fall short, that

00:11:18

is, this is the best according to the indications, but

00:11:20

this one, which was ours, that is, but here

00:11:23

it is dead, that is, nothing doesn’t show

00:11:26

now for a second these are his hands, he’s

00:11:30

dead, he doesn’t show anything,

00:11:33

he doesn’t have any indications, well, I’ll probably

00:11:37

put 11 this one because according to the diagram there

00:11:40

were two, one at a time, there’s 960 com, it’s better to

00:11:46

let it be 11 for you closer to a removable

00:11:50

solution, one big one put a little

00:11:53

I'll have to install it so that it doesn't interfere with

00:11:54

anything.

00:11:55

Now I'll install it, connect it, we'll

00:11:57

see if it's right. If not, the power supply is

00:12:00

assembled, all the elements are in place, the

00:12:02

radiator with transistors, I'll clean everything,

00:12:05

I'll clean it, I'll process everything, so

00:12:10

we have this circuit

00:12:11

plus 300 volts, and here we have 300 plus 300

00:12:15

volts, here comes the track and here is the contact

00:12:19

on 1 1 1 of the contacts of our

00:12:22

resistance, here is the second contact of our

00:12:25

resistance, if we measure it now, the

00:12:27

test is in mode

00:12:30

2 mobs, let's check what we will

00:12:33

now show 577 kopecks and

00:12:42

534 of someone else, that is, it turns out so if

00:12:46

this resistance is in good order and presses on it, you ca

00:12:48

n’t see the whole thing, but you can check it

00:12:51

only if you desolder it or

00:12:54

desolder

00:12:55

the transistor across the generator 5 volts of

00:12:58

standby voltage, that is, it doesn’t ring in any other way,

00:13:01

although I know that it’s

00:13:03

new that it 11 could be there now It’s worth it,

00:13:06

of course, I know that we should check through the

00:13:08

control light, which should

00:13:10

first blink if the short circuit

00:13:13

lights up, but now there is power, the

00:13:16

button is still on, I haven’t turned it on yet, I haven’t checked yet, I got it, it’s

00:13:19

not the power supply, I think that everything

00:13:21

will be fine, then so be it, I press

00:13:26

the button, everything is fine there was no explosion, I

00:13:33

already went through everything, well, everything was

00:13:35

powered, it started, I didn’t get here, it’s

00:13:37

just that the contacts of the

00:13:38

power supply are working, everything is fine,

00:13:41

the fan is working abroad and what I like is the

00:13:46

voltage, but you can check, you can

00:13:47

check, everything will be fine because

00:13:49

everything is in perfect condition there

00:13:50

capacitors all spare parts

00:13:52

one here was a brain-biter this is this

00:13:58

resistance at 1 megohm 519

00:14:09

so where did I end up again so on 13 no

00:14:15

need

00:14:17

1227 everything is fine we can look at

00:14:21

another 33 34 I don’t even know for some reason but everything is

00:14:31

very good what a tricky conclusion

00:14:35

malfunction if I had seen a video on

00:14:37

YouTube and I couldn’t handle it, I wouldn’t

00:14:39

have suffered for so long,

00:14:41

it leads to the fact that in the hope, my hope is that

00:14:43

this might help someone with the

00:14:45

repair,

00:14:46

whoever it helps, like, subscribe

00:14:49

to the channel, thank you all, goodbye

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На примере блока LC-B360ATX. Описание одной из возможных неисправностей. ePN https://allshops.me/redirect/cpa/o/q3y3tspb390ks8kpnpvhgmk6wwffqhpd/?_shorturl=http%3A%2F%2Fali.pub%2F4cm2l3&_shorturl_sign=7b57c1706b42377030ae07c604174977

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