⚡ Descuentos en cursos en video - Lleva tu aprendizaje técnico al siguiente nivel y aprovecha precios especiales antes de que termine la oferta. 🔥 Aprovechar oferta ahora 🔥
Tube TVs

20 inch samgung tv turns on for a few minutes or seconds turns off

romer jhon
hace 5 años
hace 5 años
Hello good night friends, well, join me. TV ... samsung Model ... ct20f3 Fail ... Which turns on and a few minutes or seconds goes OFF ... What could be the fault and I already gave the source of the + by and everything is fine the voltage when it goes off is kept constant activated with the voltage of 120 in the source of the + b ... and that if the voltage of the + b of the video card drops ... and well replace the Q. horizontal and look for all the cold welds ... and There are no filters like this in sight He cheated. What could be the fault ... and tmb change the ic. Vertical and nothing follows the same. I gave myself the components. And main voltages ....
nicomena2015
nicomena2015
9.501
hace 5 años
hace 5 años
hello clega; There are several failures, they can turn off the TV, ... the first thing, there are q, do in those cases start discarding spechoso components ... the voltage of the + b according to scheme is 125v ... if it is another version or other + b I do not have it in my files ... start x remove from the circuit to Q401 sal.hor, and connect a 60-75w filament lamp between the positive of the C812 and mass .... change the C812 of 100mfx160v and C814 of 2200mfx25v ... and see when you give power up to q, voltage reaches + b ... measure if in C814 12.5v are present ... if this is OK check multiregulator if you deliver x pin8 (regulated 8v) and pin 9 the 3.3v regulated ... if when removing the Q401 the + b is normalized in 125v with the lamp connected to the prob, it may be in the hor ... stage, the voltage that falls on the video card refers to the voltage of the 180v video ... I must drop xq, the protection cuts off hor excitation, ... test performance and source regulation first ... then see the rest ... greetings!
romer jhon
hace 5 años

Hello colleague sorry for not responding on time I had some mishaps well know colleague and connect as you told me bone first take out the horizontal Q and then as I indicated and well turn on the spotlight. And I measure the + b. And it is with 122v and well pressed to turn on just as with that voltage ... now as I should proceed colleagues.

Responder
romer jhon
hace 5 años

And in the C814 filter that you tell me ... in my case it is C815 from 2200uf A 25v ... and there it is measuring 12v

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

well: you checked the lc802 multiregulator if it delivers the 8v x the pin8 and the 3.3vx the pin9 ... measure if these two voltages are present in pin 8 and 9 ... the 12v are in C814 ..
the voltage of + b seems to be q, it is within the value q, it appears in the diagram ... besides it may q, the voltage in stan, by and power is equal to xq, was switched on with c, remote and did not turn off with the c , remote ... try turning off with the c, remote and see if the voltage in the + b goes down ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

friend: the C815 is in parallel with the D806 and D807 ... that has nothing to see ... the C814 is an electrolytic q. filter the source pulses by transforming it into DC ... (approx) .. 12v ... in the positive of the C814 you must measure what voltage there is ... the chassis of this scheme is the K15D ... check if your board is the same chassis ...

Responder
romer jhon
hace 5 años

Hello, good colleague, you know first of all the pins that I indicated ... on pin 8 the 8v is present and on the 9 it is with 5volts.
And now about the c814 capacitor that tells me there is no such filter I can not find it and as you told me that the value of that filter is from 2200uf to 25v .. well look and there is not only found the c815 filters with that value and the chassis is the same as I indicated and well there is not that filter on my board with that value ... look for arto ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

colleague: tell me that, (chassis number) is your board ... there are many different versions of samsung ... without the chassis number it is difficult to make a safer contribution ... look for it under your board it should be. ..generally they are K15A-K16D-KS9-etc etc ...

Responder
romer jhon
hace 5 años

Ok the chassis number is ... K15D that's the chassis number

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

colleague: I send you an image of the source of the K15d chassis ... from samsung ... analyze if your coinside board with the voltages and capacitors that I mention ... and the multiregulator output (pin8 = 8v) and (pin9 = 3.3v) ... this is K15D chassis ...
https://ibb.co/nda9sn

Responder
romer jhon
hace 5 años

Ok buddy those are the measurements of each pin of the multi regulator ...
Multi regulator pin measurements ...
Pin-voltage
1-8v
2-11.5v
3-3
4-3
5-5.5
6-Gnd
7-3.1 on off. And on. 0v
8-8v

Responder
romer jhon
hace 5 años

And with respect to the filter
C814-following the line as indicated in the image of the diagram. on my board is like the power supply for the multiregulator. It is the C815 filter. And the voltage is 12v

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

colleague: you can confirm q, description you have in the multiregulator q, you have on your board ... the q, appears on the chassis K15d is the lc802-KA7630 ... and pin 5 is mass ... 6 is not gnd. ..q, you have the multiregulator registration ... xq, "or" we are in different schemes or there is some error of inaccuracy ... xq, don't coin what q, says the scheme with what q, you mend ... you don't comment if the voltage q is used, it comes out of pin 9 ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

the network looks for the scheme q, coinside with your plate examine it and if that is what, correspond with your board up to see the circueteria ... well, maybe this is another chassis ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

here you have another scheme with the C815 = 12v ... check components and comment if there are coinsidencias ...
https://ibb.co/mw14Q7

Responder
romer jhon
hace 5 años

Colleague thousand apologies ...
A thousand apologies, really a thousand apologies, colleague ... well, in the description I fail. Good
Aver on pin 5 is Gnd.
And well in the image that he sent me, it is correct on pin 8 ', the voltage of 8v is present ... and on pin 9 it is with its 5v. It should be according to the diagram of the photo I command should measure 3.3'volts true ... and that difference is normal or there is a fault ... and good about the C814 filter. I think it is a printing failure. Look and there is not on the board the only thing is that there is the C815. From 2200uf to 25v. And that filter goes for mu feed

Responder
romer jhon
hace 5 años

This filter goes to the power supply of the multiregulator measuring a voltage of 12, v ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

well: then multireg, it's ok except for the 5v that come out of pin9 ... see if you have a micro al (lc201s-tda9351ps) measured on pins 56-61- if they receive 3.3v or 5v ..
the multireg, has another pin ... the 10 q, 5v come out ... look at q. multireg pin, line q is connected, goes to pins 56-61- of micro..ok ... filter 815 is fine = 12v ..
if it is not the micro lc201s-tda9351ps) the q, has your board comment q, misro takes ...

Responder
romer jhon
hace 5 años

Ok buddy good my badge takes in IC.201S .... the cod. TDA9377PS / N2 / Ai1062 ...
Well, that was the same thing about the pin that I mentioned in pin 10, well, there is no voltage. And I scraped it because it was marked in bold and fret it and it's isolated colleague ...

Responder
romer jhon
hace 5 años

Colleague tell you that in the pins I indicated bone in the pins
; 56/61 '5v arrive. I think it has the same microprocessor data. it arrives normal on pins 56 / 61los 5v.

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

well: I did not find any chassis with that micro-TDA9377PS / N2 / Ai1062.-What is on the K15D chassis is the (TDA9353 / N2) q, it is quite similar ... do not tell me what, registration or registration is the multiregulator ... the q, carries the K15D chassis is the lc802-KA7630 and on pin 9 there are 3.3v and pin 10 there are 5v ... where the voltage of the 5v comes from q, goes to pins 56-61- ... of pin 9 or pin10 ... q, the license plate has the multiregulator on your board ...

Responder
romer jhon
hace 5 años

Buddy sorry for not answering yesterday about the cod. Multi regulator The cod is. KA7632 ... and the voltage for pins 56/61 'of 5v is pin 9' of the multi regulator.

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

good buddy: the two multi-regulators KA7632 and KA7630 are practically the same in the voltages q, they come out of pin 8 and pin 9 ... and in pin 9 the two regulators come out 3.3v ... so q, ... something is bad on your regulator ... see if you are sure that, pins 56-61- feed on the output of pin9 of the regulator ... follow the track on pin9 and see if it comes directly to pins 56-61- of the micro ... I think, you should change is that multireg, x another of the same characteristics and then see what happens ... they should not be very expensive ... then we see the X-RAY if you are doing any prob, .. ok

Responder
romer jhon
hace 5 años

Ok buddy good I followed the tracks and the pin9 of the multi controller goes directly to connect to the microprocessor pins. to pins 56/61 ... and also there comes the voltage of those who mention those that are 3.3v ... which, in my case, is with 5v. And that 5v. Reach pins 56/61. As I mentioned more arriva ... and well with respect to the multi regulator replace the ka7630. Why it seems to be the same as the ka7632 ... and well nothing continues with that colleague fault ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

I do not really understand how in pin 9 deve haver 3.3v there are 5v ... you did not notice if there is any short between pin 9 and 10 of the multireg, ... do me the favor you highlight the leg 9 of the multireg, of the piasta q, goes to pins 56-61 -... q. be free of welds ... and then measure there on the 9th row of the multireg, and tell me what tension you have ... if you play the track
q, it was welded ... (it is a doubt that I have) ... then you measure on the track q, pin 9 was welded and it measures if it has voltage ... then we will see the X-RAY..q, it can be turning off the tv ... comment if you understood my suggestion ...

Responder
romer jhon
hace 5 años

Well, colleague, I isolated him as such, explained the leg 9 of the multi regulator. And first I gave it to pins 56/61. '' Bone already isolated from the multi regulator ... and measures 1.04v ... and then I measured it from terminal 9 of the multi regulator but isolated ... And it is with a voltage of 5.04v

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

Well buddy: it seems that there are two types of (K7630 ... one q, it goes 5v on pin9) ... and another one (K7630 q, it goes 3.3v on pin 9) there are other letters apart from K7630 ... look at the original q, brought and you see q, another inscription brings and you see if they are the same ... tin it back and we see the x-ray ... notice if you have these components in the x-ray box ...
disconnect a leg of the DR005S ... I leave you the image .... comment if the TV starts ... goes to pin 36 of the micro ...
https://ibb.co/hQOTL7

Responder
romer jhon
hace 5 años

Hello colleague, I can't locate the diode DR005 ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

your plate has the components q, they appear in the box of dots in the image q, you embie ... q, says X-RAY..option .... q. tension you have on pin 36 of the micro tda9353 / n2 ...

Responder
romer jhon
hace 5 años

Look I can not locate good on pin 36 / XRAY has a voltage of 2v.

Responder
romer jhon
hace 5 años

And tell him colleague that there are no such components of the XRAY circuit, which he sent me ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

well, raise the connection q, go to pin 36 leaving the R205 connected to pin 36 ... and test if it does not turn off ... see if the 16v appear in C306 when giving power which reinforces the starting voltage q, goes to hor exciter, ... the vertical is in good condition ... there are several things to check when trying to start and cut ... ok ..

Responder
romer jhon
hace 5 años

Ok ... Colleague isolate a terminal, from R205.
And Medi el.voltage of the C306, and tell you that there is no voltage when pressing stroll
It doesn't start.

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

no friend: you don't have to, pick up a terminal of the R205 leave it connected to pin 36 ... what I suggested was that you disconnect the track, go to pin 36, it comes from the fli-bak x-ray. ..in pin 36 it has q, to have more than 2v weld in parallel with the R205 of 180kohm another R of 100kohm (brown black yellow) and see if the voltage increases in pin 36 .. it has q, to have about 4v ... In your initial comment, you say that, start to start a few seconds and cut this off just like that ... you have to, have the voltmeter connected to the C306 before giving power ... then without moving the tip of the C306 das power and see if 16v appears ...

Responder
romer jhon
hace 5 años

Hang what you come to understand suggests that I isolate terminal 36 / xray. And connect it in parallel with a resistance of 100kohm to the resistance R. 205 true or as ... And now in the C306 it is with a voltage of 18v. But that still does not connect until I make sure what I reiterate ...

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

You do not understand me, colleague: leave it as it comes from the factory ... just weld an R of 100kohm in parallel with the R205 and then measure on pin 36, what voltage do you have ... and clarify that, the C306 is cn 18v .. .the 18v remains stable after giving power ... if so you also have to have the + b in 120 stable ... that means that, the hor, starts but there is no image ... you have sound ... comments if you understood me ... see if the filaments in the tube are on ..

Responder
romer jhon
hace 5 años

Hello, good colleague, I just understood. Good or colleague, I said I already put up a resistance. 100k In parallel with r. 205. And well press pawer. And in voltage I get lower I get a. Voltage of 1.7v on the XRAY / pin 36. And with respect to the voltage of the C306, a voltage of 18 / volts arrives when it is in that ignition range ... And after it is turned off, the voltage of 18v is lost. And well the image sometimes appears on and well that if with a strange sound in the fly back when trying to start. To turn on. And well with respect now that I put that r / 100k ...

Responder
romer jhon
hace 5 años

The. + B voltage is with a voltage of 151v in the off state. And, when I press pawer in that range that remains in that short time it enters, a voltage of 148v.

Responder
romer jhon
hace 5 años

And with respect to the audio there is normal audio in that course of ignition and likewise there is normal image all normal. The question is that it commutes

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

colleague: I don't know if we are in different schemes ... but 1.7v on pin36 is very low ... R205 is connected between the line of 8v and pin36 ... it's like this or not ... look well if it's as I explain it, take out the R of 100k and leave it as it was ... and measure there at the moment q, start the tv q, tension you have on pin 36 ... now something else ... measure at the time of giving power when the tv starts, what tension do you have in the C812-813 .. + b ... it can't have 148v with the tv on or I understand wrong ... explain this to me well because I don't understand ...

Responder
romer jhon
hace 5 años

Hello buddy good nose that rare but the + now measures 141.3v. And on pin 36 it measures 2.3 .. when I put that 100k resistor. When I weld it on the r205. Bone in parallel I lower the voltage to 1'5v .... And now I turned on the TV for a while I wanted to start and smoked a resistor the r414

Responder
romer jhon
hace 5 años

Colleague and r 205 is not 180k. As you mentioned on my board the r205 is 69k

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

What happens, colleague, I don't know what scheme you have on your board ... the K15D chassis does not have the R205 of 69kohm apart that value does not exist ... and the R414 is burning xq, the source is not stabilized in the 120v or 125 says the scheme ... repair your source first ... remove the Q401 salt hor, and connect a 60-75w lamp between the + by mass voltage ... positive of the C812 and mass and give power and see aq, tension you have in the positive of the C812 ... your source does not regulate well ... before you said that, the + b was at 122v ... now measures 141.3 .., with that voltage you will burn everything .. Take out the Q401 and repair your source ...

Responder
romer jhon
hace 5 años

Ok buddy are that good buddy I misunderstood you about the r205 'well instead of that resistance r205 I put a lower resistance Bone value instead of 69k I put a 47k one. In parallel with the resistance suggested by 100k. And now if it delivers to me normal it had 4v on pin 36 of the microprocessor. And but keep snooping around that r If it's very high voltage on. The + b does not understand why Q more arrives where I was in the range of 125 'in my case it was 123. That time I remember now.

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

well but your source does not regulate the voltage q, it has to be ... do not continue turning on the TV with the Q401 set xq, it will continue to burn components ... do what, I have suggested arriva ... and repair the source q, be regulated in the 120v ... until q, the source is not repaired do not put the Q401 ... do as suggested and then comment that, voltage is in C812..with the lamp connected ...

Responder
romer jhon
hace 5 años

Well buddy thanks for the good indication. In the filter of the + b C812 there is a voltage of 138.5v

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

138.5v you have in C812 .. with the lamp connected ..? .. is the voltage source passed ... in C812 deven haver 120v ... check the sampling resistance R817 of 200kohm if its value is not altered ... with the tv turned off the desoldas of a little leg and you measure it with voltmeter in scale of (ohm x2m) and see if it gives you that value d 200kohm ... in the other chassis where the C815 is with 12v the R of sampling is 120kohm. ... comment which of the two R's on your plate ...

Responder
romer jhon
hace 5 años

Hello colleague, tell you that I don't have that resistance. 317 ', there is only screen printing, there is no resistance.

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

colleague; I didn't talk to him about R317 ... tell him that. measure the R817 q, is the sampling q, is connected between the + b C812 -C813 and the (lc803) - TL431 ... programmable zener ... in the K15D scheme is 200kohm ... in another chassis where it is the C815 with 12v ... is 120kohm ... check the plate well ... and look for that R and see if it is 200kohm or 120kohm ... that R must be measured by disconnecting a leg on the ohmx-2m scale. ..to see if its value is not altered ... look closely at the previous comment because you are giving me wrong information ... ok ..

Responder
romer jhon
hace 5 años

Colleague I lost because of the mistake. Well, I was not mistaken, I wanted to tell you that it is that there is not that R817 'And also to tell you that this TV does not have opto coupler. Nor the tl431 '

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

Well, then that chassis I do not have it in my files ... q, (you have as a regulator in the primary ... what are the other intgrado q, it has) ... see if you find it in the network I raise it to see what , type of source has ... well, all that I have are with optocoupler ... ok ..

Responder
romer jhon
hace 5 años

Hello colleague sorry for not answering on time. I had some work ... well, colleague commented that he is measuring the voltage when the TV is on a voltage of 134 'and well what suggested that I put the r206 in series with a resistance of 100k. I already put it on and it's measuring the voltage of 3.8 and now I did the test to turn it on and well I see that yano goes off now that I have to do a colleague ... it does not turn off it is already on a good time and does not turn off as before. Colleague...

Responder
romer jhon
hace 5 años

Ahh and another thing, the resistance that told him that he was umming, I replaced him with another resistance of a little more power, and well, I don't smoke anymore. That resistance is normal without heating up.

Responder
nicomena2015
nicomena2015
9.501
hace 5 años

Hello colleague: I already lost the thread of that repair ... (I do not know where the R206 is used ... and in series with an R of 100kohm) ... it will not be the R205 q, it is connected between the 8v line and the pin36 ..? .. and you put in parallel one of 100kohm with the R205 ... and now in pin 36 you have 3.8v ..? .. and x that now the tv does not turn off ... and you say that, the + b is now 134v ... and the R q, smoked I do not know what it is ... but if it is already good and does not heat the tsh leave it like this ... ok ..

Responder
romer jhon
hace 5 años

Ok buddy thank you very much in advance I thank you quite good what it smoked is the r414 'and now nothing wet anymore Because I put another resistance of greater power ... and well as I did not find any component with failure in the source. And now on measures the voltage of 134v. In the + by good, the voltage on pin 36 of the x-ray is no longer turned off. 3,8v and well on r 206 I put it in parallel as you explained to me. Collect it in parallel. With an r of 100k. And now yano goes out, colleague, thank you very much, my colleague almost got me gray this TV ...

Responder
Reparaciones similares solucionadas

¿Conoces una solución?

¡Aprende a reparar con estos cursos YoReparo!

¿Tienes una mejor respuesta a este tema? ¿Quieres hacerle una pregunta a nuestra comunidad y sus expertos?
Regístrate gratis