This machine is good or bad. At first, the switching power supply did not vibrate. The user sometimes took the TV casing and used it to be normal. This time, the power was stopped, and there was no response. After a few shots, there was no response, but I had no choice but to pull it. (Other places) repair shop repair, pulled to the store did not start working properly, confessed to the user that there is no fault, please pull back, get home and can not work. The above is the situation that the user reflects with himself. Let me give the home repair through the introduction of the acquaintance. I think this problem is also simple, and it is definitely caused by poor contact with the welding. Put down the work at hand and go to the car, open the shell and carefully check the solder joints of the power supply. There are several places with the phenomenon of virtual soldering, but it is not obvious. Because it is an acquaintance who introduced the fault and simply received a 20 yuan maintenance fee, the user is very happy, too favorable, and the packing tool returns!
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The next morning, I called and said that the TV set had not responded. I heard that there was a "beep" in the machine, which was slightly different from the previous one. Based on past experience, it should be shorted. It seems that the problem is not so simple, let the user pull it into my store to repair it, and save it, it will be useless, and it will be a good test machine. The machine was pulled into the store to open the casing and found that the pipe was broken. In order to find out the cause, disconnect the load and connect the lamp to the test machine, and the light bulb is on. But found a situation, the light bulb is slightly brighter at the moment of booting, connected to the digital multimeter to measure the boot voltage situation, there is actually about 160V at the moment of opening the switch, and then quickly restore 110V normal.
The reason for the breakdown of the pipe is that the starting voltage is too high, so check the power supply section. In this case, the measurement component can only be measured by the multimeter. Therefore, the suspicious components of the power supply are replaced, and the voltage regulator, the diode, the triode, and the individual capacitors are replaced. After the start-up test, 110V is normal. But still for the sake of insurance, I will try again after the power-on (there is a lot of power supply that can't be vibrated or unstable. It can work normally when it is just soldered). After half an hour, I will watch the digital multimeter reading. High, sometimes reaching 170V and slowly returning to 110V. Blame it! Why is it still the same, what else is wrong? The removed components are normal with a multimeter. After carefully checking the circuit, there are three small electrolytic capacitors in the power supply section. I changed two, and one of them could not be changed if it could not be found. Think about this, there is still a problem, this capacitor is C810 25V100UF. I found a 35V100UF replacement from the old circuit board. The test machine is normal. After one hour, the test machine is normal. The next day, the test machine 110V is normal! This time, I finally finally ruled out the fault, like a fish! Ha ha! (Think about this capacitor should be very good at the time, I don't know what the reason was not changed at the time, although not so smooth, but also locked the core of the fault)
Summary: According to the user's response, this machine has never turned off the power supply, and it has only been remotely controlled and shut down. At that time, I told the user that this is not good for the TV set, there is a circuit at work, and it consumes power. The user is very obedient. If the user still does not have AC shutdown, it is estimated that the tube will not be burned this time, because the power supply will work normally and the output voltage will be normal. But the problem is sooner or later. Such a power supply part has an electrolytic capacitor that is prone to failure, and the user never shuts down, resulting in premature component aging. The first time I repaired the payment, I didn’t charge very much this time. In order to be able to pay for your own efforts, truthfully tell the user about the situation, this maintenance fee is 60 yuan! 2175E.pdf
