Plasma tv has been reading about it in books, pictures and videos on the internet, and there's really no physical contact. No, the day before yesterday, a plasma television was fixed, 50 inches of long rainbows。
It's a platform bill, and when you contact the client, the client says it's a super thin television, and i think it's a super thin liquid crystal tv, so it's a flash off from the failure switch, judging by backlight ageing and the need to replace backlights。
When i came to the door, when i saw the television on the wall, it felt that it was not lcd television, because when lcd television was not on, the surface was black and the television was grey. Once again, there are many smaller cells on the screen, and lcd television cannot see the smaller ones without a magnifying glass。
Is this plasma tv
When the power was turned on, the logo of the rainbow was just flashing, and later there were ads on the screen, and then it was dark, and the power light was not on. At this point, the television did not react, either by pressing the remote control or by pressing the stand-by switch on the television。
Fault analysis:
I looked at the relevant information online, and the plasma televisions y and z panels, which are the control panels that carry high-pressure overboard, have a high failure rate, and they are easy to break short circuits through. However, when the television was fixed, it was also reflected that, if it was a y-board or z-board short circuit, the failure of the television should have been reflected in the lighting of an additional light, which would have been extinguished as a result of the power protection and the screen would not have appeared。
It was also seen at a later stage when the plates were removed and the substrates were fitted with thermal silica pads used to transfer the high temperature generated from the work of the plates to the metal casings of the television set-up and to expand the area of dispersion. The main tube has also been fitted with thermal silica pads, and we need to be careful when changing the y and z plates that cannot be lost。
2. The power plate is likely to carry a load capacity deficit due to its prolonged use and the reduced capacity of the electrolytic plastics. The output voltage is stable at this time because the load is light. When the y-board z plate starts work, the power output is protected because of overloading, which is why the measurement of the 200v voltage after dismantling is stable at first, and then the voltage is slowly decreasing。
3. As the television sets were opened with the appearance of logo and with the appearance of an advertisement, the main and logical panels were judged to be fine, and the fault points were y, z, buffer and power panels。
Fault repair:
Because this was the first time that the plasma television was exposed, the key voltage was also judged by the labels on the back of the television. It is because of the first maintenance of ion television that there is no reference to experience, and all that can be relied on is the electronic circuit base and the opinions of the shrimps on the internet。
However, although plasma television has slowly faded out of our lives, the spare parts are cheap, even if they're deciphered, so i talked to the merchants, bought the power panels and the y panel z, and came back to replace the screen。
When the board arrived yesterday, i made an appointment with the client. Plasma televisions can be repaired as long as their screens are not leaking, only running a few times. Yesterday, the temperature was still high, at more than 1 p. M., and there were not many people on the street. I went on a motor vehicle with a board。
I was careful to change the tablets, and the heat silica pads were not damaged at all, and the screws were all installed, and the y and z plates were replaced, and the sound of the boom remained。
The replacement of the power panels, the normal opening of the television set after the installation of a test machine, the breakdown of which had been caused by the ageing of the panels, had taken place for 12 years。
Since the television sets promised to keep the customer on a warranty for a year, they were turned on without covering the shell, running for 20 minutes, using thermal imaging to measure temperature, and the power plates, main plates, y plates, z plates were normal and the maximum temperature was not more than 54 degrees. That's good enough. The previous phase of sony's lcd tv, with the power plate at 87 degrees。
When the bad board is brought to the company, i see the problem. The point is that there is no way to conduct detailed electrical circuit analysis and repair as long as the screws are right。
