After the middle-aged man left, the girl turned on the TV, and after the TV was turned on, a vertical bright line appeared, which was in the center of the TV screen, which was a typical line circuit problem.

The girl familiarly opened the back cover of the TV and pulled out the circuit board inside.

"It's a circuit problem!"

After Yang Yichen's words were finished, the girl looked at Yang Yichen in surprise: "You also know about home appliance maintenance." ”

It is impossible to know this kind of professional stuff without a special understanding. And Yang Yichen could see the problem at a glance, and he knew that he must have specialized in these things.

"Understand it!" Yang Yichen said modestly, he can't say that he is very proficient in home appliance maintenance! This gives people the impression of being a bit arrogant.

"I also know that it is a problem with the line circuit, but it is normal to check the line voltage of 110V, remove the line circuit and use a false load to measure the voltage, the voltage is also very stable, and the bulb has been shining normally. ”

"That only means that the supply voltage is normal, but it does not mean that the circuit is fine. Yang Yichen said.

"So I focused on looking at the line circuit components, changed the line capacitor, the line reverse capacitor, and finally even the high-voltage package was changed, the TV was normal, I thought it was repaired, but now it seems that the high-voltage package should be fine!"

Seeing the girl holding the multimeter and frowning, Yang Yichen continued: "The TV can be normal, which means that there are two situations in the circuit, one is that the circuit appears solder joint sweat, when the TV is heated, the fault phenomenon will appear, and there is also a situation that is the original of the circuit, there is a false good situation, that is to say, the original is good to measure, but in fact, it is already a semi-bad original." ”

Hearing Yang Yichen's analysis, a smile appeared on the girl's face, and she also had some ideas in her heart, why didn't she think of it.

"Thank you, you're amazing!"

Yang Yichen wanted to say Little Sister, is such a simple common sense still called amazing? Your skills are really not average.

The girl picked up the electric iron and welded the circuit to a comprehensive repair, and then tested the machine, and the fault was still the same.

Still no, the girl is a little discouraged, can't this TV be repaired? If you let the customer take the TV back, not to mention the reputation of the store, just say that the accessories that were replaced before are all paid for by yourself, and the loss is real.

Yang Yichen saw that she really had no tricks, so he walked over, picked up the multimeter and measured it.

"You watch from the sidelines. ”

The girl obediently moved her position out of the way, and from the conversation just now, she knew that Yang Yichen must be better than herself.

Yang Yichen simply measured a few key points, the CPU module, the power supply voltage is normal, the pulse voltage is also normal, and the reverse voltage is also normal.

"You go get a pipe of the same model!"

This element has been measured by itself and is normal.

"The line tube shouldn't be broken! I've measured it a few times. ”

"Some things are not necessarily the truth when you see them, you can take them. ”

Yang Yichen actually has 90% in his heart that there is a problem with the line pipe, the reason is that when the line pipe is powered on, the temperature rise of the line pipe is abnormal, it stands to reason that the normal temperature is 40 to 60, but the line tube is at least 70 or more, which means that the thermal stability of the line tube is not good.

Another point is that when the voltage is measured by this line tube, there is a slight change in the voltage of the line tube, which is difficult to see from the multimeter pen, and only Yang Yichen's proficient home appliance maintenance can be keenly seen.

Soon the girl found a new line pipe,Yang Yichen took a look at this line pipe,This line pipe is not good,Insufficient power,Easy to burn out,Generally, this kind of line pipe is used on 14-inch TVs。

"Take a 1702 pipe, this one doesn't have enough power. ”

"Oh!"

The girl quickly found the line pipe that Yang Yichen wanted, Yang Yichen got the new line pipe, and skillfully welded the line pipe with his hands, then replaced the new tube, and then locked the line pipe with the heat sink.

After the incident,Yang Yichen pushed the circuit board into the TV card slot,Then turn on the test machine,The girl still didn't believe that the TV was repaired,As a result, as soon as the TV was turned on,The TV returned to normal,There were snowflakes full of screens on the TV,The TV was repaired。

"You're so powerful, but why didn't I find out about such a simple question?"

Yang Yichen didn't want to laugh at her, this seems to be a simple question, but in fact, it requires a wealth of theory and maintenance experience.

Yang Yichen installed the back cover of the TV by the way. , then take a wire, start the test for half an hour, if nothing is done, it will be repaired.

The girl was very happy, and then said: "You can teach me to repair household appliances, and I will worship you as a teacher." ”

Why worship me as a teacher, I am still a student, besides, how can I have time to teach you, just seeing the girl's watery eyes, looking at herself all the time, Yang Yichen was a little unbearable to refuse.

"I'll come and teach you when I have time. ”

"Really? Great, master!"

Master: I became someone else's master in a daze, I can't tell you what mood I feel, I just feel weird.

"Master, please help me watch this TV again! I've been using it for several days, and I haven't been able to fix it. ”

Is this called a cheap master? As soon as he took office, he let himself build a TV, and it really didn't waste resources at all.

"Turn on this TV and I'll take a look. ”

After the TV is turned on, Yang Yichen looks at this TV failure, which is actually not difficult, that is, the color is biased, and the red color is missing, so watching TV looks cyan.

Yang Yichen took out a multimeter to measure several key voltages, then photographed the circuit board, and finally the meter pen touched the potentiometer, Yang Yichen put down the multimeter and said to the girl:

"You can just get this potentiometer and put it in a new one. ”

The girl didn't expect Yang Yichen to be so powerful, in just a few seconds, the fault point was determined, with half-belief, the girl changed to a new potentiometer according to what Yang Yichen said, and sure enough, the color of the TV was much better, but it was still a little color cast.

Yang Yichen took a screwdriver and adjusted the potentiometer slightly, and the color of the TV returned to normal.

"Master, you are too powerful!" Saying that, the girl hugged Yang Yichen's arm excitedly, Yang Yichen was new, her private place pressed her arm, it was too big, Yang Yichen wanted to scream comfortably.

Suddenly, the girl found that she had lost her temper, and when she saw her arm pressing against him in that place, she hurriedly let go, but her face was red, and it was very cute.

Busy helping the girl repair electrical appliances, the time has come to noon, Yang Yichen said that he wants to go back, but the girl wants to keep him to eat, Yang Yichen saw that there is no kitchen here, where to cook, but the girl took out an induction cooker and a pot from the side.

It turned out that this was the way to cook, Yang Yichen saw that she was going to do it, and said first: "I'll do it!"