Since entering the appliance repair forum on March 31, it has been deeply attracted by the forum. The games played in spare time are not played. Almost every day and night are in the forum, and the maintenance is on the side for several days. It seems that I have forgotten that I still have a home appliance repair profession.
One afternoon, another customer called and said that his TV only had no sound and no image. Please ask me to help me immediately. Because I was watching the post to work hard, I asked him to repair it tomorrow. Just on the other side, there are still two TV sets to be repaired. Going to work together tomorrow will save a petrol.
Helpless customers say they want to watch a wonderful TV series, afraid of the plot is out of touch. Speak some good words. Because I am a long-time old shop, the customer respects me more, and I don't want to hurt the feelings of the old customers, so I am reluctant to drive to his home.
When I came to the customer's home, the head of the household was very polite. After a chill, the boot is the phenomenon that we usually encounter without grating (black screen), with normal sound. The model of the machine is Konka P25SK071, open the back cover, pull out the printed board, and then turn on the power to check the voltage of the key point, wow! ! The raster is out. Plug in the antenna and the image and sound are normal. It is considered to be a common problem of virtual soldering. The main chip OM8373 and other suspected solder joints are repaired one by one, and the installation is tried again. The charges were gray and black, and immediately went to their own homes, and the other two customers did not go. Time is not early, go back to the forum early, and to be honest I am already addicted.
After another two days, the other two customers’ machines were only fixed.
Another day later, Konka’s owner called again and said that the TV had no reaction. Did not dare to neglect, put down the phone and then rushed to his home. My maintenance tenet is: Rework priority; eradication repair at all costs.
This time, it turned out that there was no reaction at all, and the indicator light was not lit. Although the owner is still polite to me, I found that I can read the doubts from his face, and the smile is reluctant. I think that a poor quality may say: my machine has been repaired by you.
Open the cover and check the breakdown. Remove the down tube to connect to the dummy load, then turn on the power, the indicator light is on, +B is normal, check the reverse path capacitance is normal, there is no obvious short circuit in the line part, the problem of the virtual soldering has been repaired last time, no need to check. Change the tube and replace it with a crystal. The boot image is normal, and after half an hour, the hand touches the tube heat sink, which is slightly hot. It is considered that the damage to the pipe is accidental and installed.
When the student resigned, the head of the household took out 20 yuan to make a cost, and refused to accept it. The head of the household repeatedly thanked him.
Later, the days were safe, but I still remembered the machine a little.
I had just had lunch yesterday, and the phone ringing. It seems that the electric display is the mobile phone number of Konka's owner. The situation is not good. I immediately answered the call, and the owner said that there is no image.
I put down the phone and quickly arrived at the owner's home, and immediately entered the maintenance state. At this time, I don't know if the owner is happy or not. This time I didn't have the heart to observe his facial expression.
Power-on check, the sound is normal, the line output stage does not work, and the line voltage of the tube is only 1.1 volts. Then check and drive the primary open circuit of the transformer, there is copper green mold in the deep pin. The owner said that there was a vertical bright band in the middle of the screen before the machine was bad. It turned out that the real murderer is here, so completely relieved!
Hurry and change the line to push the transformer, boot everything is normal.
At the time of departure, the owner had to pay 50 yuan for the maintenance cost of the second time. However, he finally received 20 yuan.
Summary: The two black screens are caused by the push of the transformer. Because the primary coil is open, the open circuit is just a state of detachment. When the switch is turned on, the machine works normally. When it is not working, it will be black screen, causing the first inspection to be a virtual soldering fault. Overhaul; burning tube is also caused by the lack of incentives for the line to push the mold.
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