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Tube TVs
Tv CRT Heats Chopper Transformer, Switch and Horizontal
192
hace 5 años
hace 5 años
Hello friends, this tv did not turn on, after correcting the voltage of + B in 110, it turns on normally, it is a Chinese TV of Magnus brand, with CRT plate number ZY-T2110A-01, in the end I will attach photographs. It has all the components of the board in perfect condition, but I don't understand what makes me consume too much amperage which is what I think, because of the overheating of the chopper transformer, will this be normal on Chinese TV?
The horizontal transistor reaches 57 degrees, the primary source switch at 45 and the choper equal to 45 and 50 degrees. I changed the capacitors of polyester and nothing has improved, the electrolytic ones in the same way, the resistances are in correct measure. Could it be some transistor that goes to the socket of the tube that causes that heating? as I said the tv works perfect, what worries me is the temperature, grateful in advance.
https://ibb.co/YcWhdfZ
https://ibb.co/5BzYKmj
46.781
hace 5 años
hace 5 años
Most Chinese Chassis release energy manifesting in temperature in various components or work stages, including: The source, the vertical, audio, and the TSH.
After what time does it reach the temperatures indicated?
How long (hours) have you done it work?
17.741
hace 5 años
hace 5 años
Friend, a question.
Touching with your finger the body of the regulator and the TSH burns you? Or slowly feel that it is warming more?
The finger is my meter.
Where are you measuring that temperature. In the body or heatsink? I ask you this because we worry when we take a temperature in the heat sink and it is hot. It is logical or normal. It fulfills the function of dissipating the heat of the component. As a consequence, the body of the ic must be at a lower temperature and always tight. Not all components are in good condition with the naked eye. I see source output filters already bulging.
The flyback does not heat up?
Does the vertical ic also heat up? Which is normal. But you should not burn your finger well you touch the ic or TSH.
These TVs are very hot. More if they are Chinese. I put if everything is ok a cooler or PC fan and solve the problem and guarantees you more TV life.
192
hace 5 años
Hi, thanks, I took the measurements in the chopper and Chopper body, slowly heat up. The Fly does not heat, it was coming to the conclusion of the cooler and it is true that the Chinese is always damaged by its bad designs in dicipation, especially in audio equipment 2.1 that I must always modify transformer and decipator.
192
hace 5 años
I really appreciate the help, if I could qualify everyone as winners Luis would do it, but Nicomena, described me in detail how to get the 12 voiltios out of the flay, that's why I rated him, a thousand apologies if I offended you.
17.741
hace 5 años
It happens that that TV has no problem. They are like that or they make it that way. When you repair it, it is better to place the fan more than anything for warranty. As I told you before it lasts longer. And you look good with the client. Spare parts greatly influence. They are not quality. Now to the other topic. You don't know how far your knowledge goes. If you didn't know how to install it, you just have to ask and that's it. I suggested the idea first of the cooler. Not another colleague. Everything happens for lack of support among the colleagues who participate.
Also in your question you doubted the working temperature of the components.
17.741
hace 5 años
The subject really had to close when they told you that the working temperature on these TVs is common.
Another thing to be honest is that you inform that there is a lot of amperage consumption. You do not report that as a determinant. You have to know how to measure that. And if you know how to do it, the weird thing is that you don't know how to place a cooler.
All good from me. Salu2
9.501
hace 5 años
hace 5 años
Hello colleague: apparently the team has a good dictator ... you mention that the TV consumes a lot of amperage according to the temperature that originates from the source regulator ... that temperature that it mentions remains the same over the course of a couple of hours ... or it is increasing little by little ... the 29 "TV and the slim tend to develop more temperature than the common 20" -21 "curved screen ... to discard more consumption beyond those spelled on the back cover in watts ... you can improvise an AC ammeter ... you can connect a resistor (10ohm x 10w) in the place of the input fuse to the source and then connect the voltmeter at the ends of the R of 10ohm on the ACV scale. X 20V ... there will appear the drop voltage in the R of 10ohm ... (example) if in the voltmeter it accuses you 4vac ... on tv you would be consuming some 400mp ... if the voltage of the electric network is 220vac ... in this case it would be 0.4A x 220vac = 88watts ... q, it would be normal in 20 or 21 "TV ... it is important to see , consumption in watts specifies the manufacturer on the back cover ... then make the calculations and see if what the equipment consumes is within the specified ... it is important to deactivate the PTC for this test ... ok ... Cheers!!!
192
hace 5 años
Hello dear nicomeda I will try it for more hours. Then I will review components again. Finally experimenting putting a cooler, which I never did and no idea where it would be better to take voltages without affecting the source ... greetings.
9.501
hace 5 años
Actually I should not heat the source regulator so much ... apparently it is well dicipated ... do not comment if it is a 29 "or slim TV ... or flat screen ... 40 or 50 degrees in the dictator does not stop a exaggeration ... if that is, it remains stable at that temperature ..
with respect to the coler, if you are going to adapt it, you should look for a point where the air gives the whole plate ... the tension must be taken in the nucleus of the fli-bak ... given that, the coler must be turned off when turn off the tv ... ok ... try 2 turns of insulated cable to the fli-bak core ...
9.501
hace 5 años
one tip of the 2 turns the solder to the negative of a 470mfx35v capacitor .... the other tip of the 2 turns the solder to the anode of a fast diode like the uf4007 ... then the cathode of the diode uf4007 the solder to the positive of the C of 470mf ... then measure between the negative and positive capacitor q, tension do you have ... if you have about 10v it is enough to apply it to a coler for 12v ... more tension does not combine anymore than q, it would vibrate a lot and could let go ... look for q, the air will give the source set and its decipator ... a 12v pc coler can consume about 150mp ... does not affect the fli-bak ...
192
hace 5 años
It is ultra slim. I forgot to mention that when I saw it for the first time, a resistor was totally burned, of which I don't know the value, it is the R460, and based on a Chinese diagram, I put a 270 ohm on it, that resistance goes to the coil or yoke . Now I am going to perform all the tests that my friends recommended.
192
hace 5 años
Thanks Nicomena, at the bottom of the letter the cooler with 10 V, never more hot or chopper, nor horizontal and commutator, keeps the room temperature for three hours watching a movie and everything without heating, except the yoke coil, which arrived at 57 V. don't know if it is normal to heat too much thanks.
9.501
hace 5 años
Hello colleague Mariscal850: ... if you have placed the cooler with 10v of power and it has solved the problem ... from me "congratulations" on the achievement ... once again a cooler appears as a solution for some tvs..al which is no other way to lower the temperature q, some components originate ... I was one of the first to suggest this solution long ago on this page ... and it was adopted x many technicians with positive results ... now no forget to value my contributions as (solution) under my first comment ... ok ... until another opportunity ... greetings!
17.741
hace 5 años
These TVs are very hot. More if they are Chinese. I put if everything is ok a cooler or PC fan and solve the problem and guarantees you more TV life.
10.397
hace 5 años
hace 5 años
hello, check if there is any electrolytic around 1mf connected to any leg of the horizontal driver, change it, as well as some high voltage ceramic capacitor between E and C of the TSH, although as the colleagues say these chassis are to overheat It is worth reviewing this, if everything is normal and equal heats, you can place a cooler working at half voltage so that it does not produce noise this cooler can feed it directly with a few turns of wire on the flyback and rectification with a diode, it is practically very little consumption of it, greetings
hace 5 años
hace 5 años
Friend adds a PTC thermistor to the power input of the TV after the rectifier diodes place it in series that will help to maintain stable work level of the components as if the TV was turned on using a test bulb.
87
hace 5 años
hace 5 años
In fact the discoloration, or reddish tone of the board indicates that the components in those colored parts have been generating high temperatures. From what it looks like that has been like this for a long time. I believe that these temperatures are normal. On the other hand, it sometimes happens that the horizontal output transistor is overheated by a slight (or large) variation in the horizontal scan frequency caused by a damaged oscillating crystal. But in the case of a switched source this is different. I think that if all the voltages of the TV are correct the system in general of the TV is good, although it generates a lot of heat. In the end, the heat generated is wasted energy caused by bad or poor designs, and in an economic TV of Chinese origin, this is absolutely understandable, in fact many Chinese manufacturers buy obsolete technologies from "good" manufacturers and create new TVs with these technologies already obsolete and deficient.
However, if you are dissatisfied with the hot operation of this TV, you can get the service manual and monitor with an oscilloscope the waveforms generated in the different parts or components of the TV to detect anomalies and correct them.
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