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Channel: GARAGE 55

ремонт техники

ремонт бытовой техники

ремонт телевизоров

электроника

самоделки

своими руками

бытовая техника

как отремонтировать

телевизор не включается

пайка светодиодов

замена светодиодов

ремонт подсветки

телевизор

не включается

не работает

не показывает

полоса

узкая полоса

кинескоп

кадровая

ремонт рахвертки

ремонт кадровой

отклоняющая система

полоса на экране

нет картинки

00:00:02

give me a sharp TV model 25 k1, I

00:00:05

received a problem, a narrow band on

00:00:08

the kinescope, the TV itself imagines

00:00:10

two boards on one of which

00:00:12

is the video processor itself, the tuner is also

00:00:16

what it is and 2 fruits, this power supply unit is

00:00:20

scanning and vertical

00:00:23

scanning,

00:00:25

let's also first we

00:00:27

demonstrate that the TV with

00:00:30

the malfunction

00:00:31

was used for a very long time, that is, if you pay

00:00:35

attention, you can see two stripes,

00:00:37

evidence that the TV

00:00:39

was used for some time with a

00:00:41

free frame scan and this

00:00:44

led to the fact that it was a little burned out

00:00:46

for and now I’ll connect the TV to the

00:00:53

network and demonstrate it behavior,

00:01:01

that is, we have such a defect on the

00:01:05

TV screen.

00:01:07

Now it will be necessary to check the

00:01:10

power supply, that is, check for ripples

00:01:14

in the secondary parts of the

00:01:16

power supply and also for the power supply of the vertical scanning chip

00:01:25

separately behind the scenes, I checked the boards;

00:01:29

there was a loose connection on the voltage regulators of the

00:01:33

1605 axis; a 12 volt stabilizer is

00:01:37

also a voltage stabilizer on

00:01:40

axis 1604, this is on a 5 volt stabilizer,

00:01:44

ace 16 01 is an

00:01:47

8 volt stabilizer and on axis 602 a

00:01:50

9 volt stabilizer, I also

00:01:56

found a short circuit along the

00:01:58

12 volt line just on the

00:02:01

12 volt stabilizer, this stabilizer powers us

00:02:04

microcircuit as its markings

00:02:10

vertical scanning microcircuit we have la 78 38 but

00:02:14

unfortunately I don’t have such a microcircuit

00:02:16

only lad 78 37 let’s

00:02:25

check that on the first leg of

00:02:28

this microcircuit the microcircuit itself may be faulty

00:02:42

here 8 and 8 minds almost 9th also to the

00:02:49

power supply of the microcircuit itself, we have 29

00:02:53

volts, the 13th pin of the microcircuit itself is supplied,

00:03:02

here we have no short circuit,

00:03:04

prize, the main power supply of the microcircuit is

00:03:07

normal 1 here is the microcircuit we have, this is this one

00:03:10

1 12 volts 13th in this we already have the

00:03:15

supply voltage of the output stage

00:03:19

itself frame scan,

00:03:23

let's check up to the resistor, that is,

00:03:28

here there is 12V power supply through resistor r

00:03:31

508, maybe the problem is not there 26th, that

00:03:39

is, there is a short circuit on our side of the

00:03:42

microcircuit, otherwise the resistance would be lower,

00:03:48

the resistor itself is 20 m,

00:03:57

let's now look at the microcircuit itself

00:04:00

since it is clearly faulty in our case,

00:04:04

since we have practically

00:04:06

but not a short circuit, but the

00:04:09

resistance is quite low on

00:04:11

this line,

00:04:52

here it is, the la 78 38 microcircuit, let’s

00:04:59

now proceed directly

00:05:01

without taking measurements, so it’s

00:05:07

enough to check with a faulty microcircuit and it will be dangerous, I’m

00:05:11

building as much as possible, for example the

00:05:13

same bullet stabilizer is not 12 volts,

00:05:16

apparently it will not be possible to check without a microcircuit

00:05:19

since the protection is triggered,

00:05:23

so it will be necessary to disable this

00:05:26

protection

00:05:28

if you look at the diagram

00:05:30

10 pin main protection protect we will

00:05:34

now disable it, actually I will disable

00:05:38

it quite simply

00:05:43

[music]

00:05:45

by removing it all the tin is directly from the

00:05:49

connector itself on pin 10, so let’s

00:05:57

see now that there

00:06:08

will be enough contact at the

00:06:12

moment on the connector itself,

00:06:20

apparently the TV is now not leaving

00:06:23

protection until it is now necessary to also

00:06:27

reduce the accelerating

00:06:30

TDX itself, reduce the screen and now let’s

00:06:35

do

00:06:37

Voltage measurements The first is the drain power supply

00:06:44

120 volts, you can measure it

00:06:50

at the ninth pin of connector p600 2

00:06:58

exactly 120 volts,

00:07:02

then with plus b this is the power supply

00:07:07

directly to the low-frequency amplifier

00:07:11

27 volts, the

00:07:14

remaining voltages will need to be

00:07:17

checked directly on another

00:07:19

connector once again power lowercase 120

00:07:29

power supply to the low-frequency amplifier

00:07:32

twenty-seven and three we have the next connector

00:07:37

plus 5 no one but according to the diagram there we

00:07:44

get 9 volts they betrayed the

00:07:48

voltage stabilizer is already going directly

00:07:49

5 volts

00:07:52

this is our 4 pin of another connector p 601

00:08:01

nine and nine

00:08:03

everything is normal and the voltage is 12 and 15 volts

00:08:15

12, here we have 11,815, we have 12 7, that is, the

00:08:23

voltage is normal, let’s now

00:08:27

see directly what we have on the

00:08:31

vertical scanning chip,

00:08:33

what voltages are coming in,

00:08:40

13th, this is our

00:08:42

power supply for the final stage, 40 volts

00:08:52

according to the same circuit we should come

00:08:56

twenty-nine and three, that is, 30 volts,

00:09:00

the voltage is too high, but there is no

00:09:05

vertical scanning chip

00:09:08

itself, I checked the voltage here,

00:09:10

here we had 29 volts of the mixture with us

00:09:13

with the vertical scanning chip installed, the

00:09:17

first output is that we will have enough 1 12

00:09:21

volts all in normally,

00:09:23

let's now measure all this

00:09:28

using an oscilloscope,

00:09:33

look at the 13th pin of the vertical

00:09:37

scan microcircuit with pulsation, we don't have a

00:09:45

vertical scan microcircuit on the first pin,

00:09:47

also, in principle, within the normal limits,

00:09:53

then

00:09:58

build the power supply on 120 volt sweeps,

00:10:00

also everything is normal,

00:10:06

power supply of the low-frequency amplifier Also,

00:10:14

normally there is no pulsation observed,

00:10:17

11 volts are normal and 15 volts, but along the 15

00:10:27

volt line,

00:10:28

well, there are small

00:10:32

pulsations, that is, you will need to

00:10:38

check the filter capacitors of the

00:10:41

power supply, also check the capacitor and

00:10:45

headbands, vertical scan microcircuit,

00:10:49

and also check the capacitor and horizontal

00:10:53

scans obviously the microcircuit will need to be

00:10:58

changed since it is faulty;

00:11:03

if they replace the capacitors in the

00:11:07

wiring of the vertical scan microcircuit, then

00:11:09

the microcircuit simply

00:11:12

fails when it is reinstalled; I

00:11:16

only have the la 78 37 microcircuit;

00:11:29

in fact, these are microcircuits of the same series,

00:11:34

so I

00:11:35

install it only for testing,

00:11:41

and then if necessary, I will

00:11:45

order a microcircuit; also, the

00:11:48

vertical scan microcircuit is not installed yet;

00:11:49

I will check its capacitors in the harness;

00:11:52

the first is the same 507 100 microfarat 50

00:11:59

volts; the capacitance is underestimated; dsr is also overestimated;

00:12:04

Mr. we have to be 003 crazy, that is,

00:12:10

several times if we exceed our

00:12:14

readings, and also the capacitor for

00:12:20

powering the vertical scan with 620

00:12:33

thousand nine hundred microfarads, sir, three

00:12:38

hundredths of the crazy,

00:12:40

this capacitor is normal, but the

00:12:43

capacitor all 507 will need to be

00:12:45

replaced,

00:13:07

and also that this still needs to be done

00:13:09

check

00:13:11

come to us the signal directly the

00:13:13

vertical scan microcircuit itself

00:13:15

refer to the account this is the second output the input of the

00:13:18

vertical synchronization pulse

00:13:23

signal we have,

00:13:25

that is, now it will be possible to install

00:13:28

directly the microcircuit itself,

00:13:32

I will install it without a

00:13:35

radiator for now just to check it,

00:13:51

I always have some - then there are problems with the

00:13:54

vertical scan microcircuit, I check

00:13:57

whether we have a short circuit

00:13:59

in the power supply and at the output of the

00:14:03

vertical scan microcircuit itself, that is, when checking the

00:14:05

cash registers, I discovered that the

00:14:07

resistance along the vc-1 line is underestimated. Now it

00:14:11

will be necessary to check by connecting

00:14:14

the TV directly to the network if

00:14:16

We are directly providing

00:14:18

scanning ourselves unfortunately the vertical scanning chip

00:14:21

turned out to be faulty 88 37

00:14:25

we look at the second output of the microcircuit, this is

00:14:28

our pulse input as we see the signal

00:14:33

we have, well, output 12 pin here we have

00:14:38

nothing at all, the game is not a

00:14:43

new topic, so there was an option that any

00:14:46

of the microcircuits I have may simply

00:14:48

not be working properly,

00:14:49

so microsd he will have to order the

00:14:53

first microcircuit from the factory, let’s see

00:14:59

what it’s like to crawl away in Omsk, well, I

00:15:07

had to order it right away, it’s clear that the

00:15:14

microcircuit is new microcircuits

00:15:18

seventy-eight thirty-eight and seven

00:15:20

differs only in power in essence,

00:15:23

these are absolutely identical microcircuits, all that

00:16:02

remains now is to connect the entire network, do not

00:16:06

check the work of the blackboard

00:16:09

after installing a new

00:16:11

frame scan microcircuit, as you can see,

00:16:13

once it returned to normal,

00:16:16

of course, the screen itself is a little dim and most

00:16:21

likely the princes are already planted here, that is,

00:16:24

among other things, there is also there are two

00:16:26

bands

00:16:27

that arose as a result of the long-term

00:16:30

use of the TV in a non-working

00:16:32

state, and that is, the phosphors have worn out a little, you

00:16:37

will also have to replace the capacitors, the

00:16:40

power supplies will most likely have to

00:16:42

change all the line scans and

00:16:46

frame scanners since the TV is quite

00:16:49

old, I will check the picture

00:16:53

directly by

00:16:56

sending a signal from the antenna like this Well, it’s impossible to

00:16:59

evaluate the picture here on an image like this,

00:17:03

so now I’m

00:17:06

checking the capacitors, I’m also checking

00:17:09

the image to see if everything is

00:17:11

in order, but if it

00:17:14

turns out to be faulty, then

00:17:19

the TV itself is just in the trash,

00:17:21

I’ve already been paid for spare parts in advance, of course,

00:17:25

that is, I’m essentially I’m only losing my

00:17:28

time,

00:17:29

spare parts, that is,

00:17:32

directly for the microcircuit itself, everything has

00:17:34

already been paid, all that remains is to complete

00:17:37

my work before checking the capacitors, I

00:17:42

’ll say right away that I won’t shoot a

00:17:45

video, completely replacing all

00:17:47

capacitors, I’ll check it, I’ll just check behind

00:17:52

the scenes each capacitor power supplies

00:17:55

in the personnel urgent and all the results have already been

00:17:59

announced at the end when the repair is completed,

00:18:03

well, for example, a capacitor is 33 micra

00:18:07

parade and

00:18:08

at 250 volts dc 651,

00:18:14

of course, according to the diagram, I won’t show

00:18:16

where it is installed because the diagram there is

00:18:18

quite old and not

00:18:24

everyone will generally understand that somewhere there where is what in this

00:18:27

circuit is located and where does it go as the

00:18:31

circuit skips

00:18:32

and sky for a long time, for example, 33

00:18:40

micro devices 250 volts

00:18:42

capacity 28 microfarads there is a 15th

00:18:47

capacitor installed on the power supply

00:18:50

of the

00:18:51

video communication amplifier located directly on the

00:18:54

kinescope board itself

00:19:03

and from this capacitor should have been

00:19:06

but on the 5th, that is, sr is exceeded

00:19:11

many times over, in fact, as I think,

00:19:15

almost all the other capacitors,

00:19:18

but this is the dress,

00:19:22

now I’ll check the capacitors, replace them,

00:19:26

and the results will already be at the end of the video,

00:19:30

you check the capacitors, it was revealed

00:19:33

that the capacitor is faulty, the first is c 651

00:19:38

we will set the video amplifier power supply to be

00:19:40

30 microfarads and 250 volts,

00:19:42

also in vertical scanning all

00:19:46

503,470 microfarads at 16 volts

00:19:49

for 506 thousand at twenty-five volts

00:19:51

c602 220 at 10 volts and c600 41 at 50

00:19:56

volts and also in the c720 power supply that

00:20:00

we have 100 volts up to 700 24000 but twenty-

00:20:04

five volts c 623 two hundred twenty twenty-five

00:20:07

volts c720 1 470 at 16 and c700 310 at 100 volts

00:20:14

let’s randomly check the capacitors,

00:20:19

well, let’s say we have a thousand at 25, it’s clear

00:20:28

that the capacity is significantly underestimated, it’s 330

00:20:36

33 microfarads on 25 volts with r16 we

00:20:42

should have it

00:20:45

05 aman 470 by 16,368 microfarads 470 16

00:20:55

there is nothing at all 220 by 25 there is

00:21:02

also absolutely nothing, no

00:21:05

capacitance, that is, a capacitor and without rights it

00:21:11

could be considered successful there is

00:21:15

one thing, but you yourself did not sleep with a

00:21:24

significant degree gives off blue, well,

00:21:29

the image is not

00:21:30

bright enough, that is, everything is

00:21:34

quite a jerboa, the colors are unnatural and we’ll

00:21:42

cook it at the same time, it’s completed everyone who

00:21:45

liked it, write your comments,

00:21:47

like it, subscribe to the channel,

00:21:50

also don’t forget to set the bell

00:21:52

so that you receive notifications about

00:21:54

new videos, thank you all for watching until

00:21:57

dates

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