Konka color TV lightning fault repair example - Appliances
Because of the time relationship, the power supply part maintenance (power part: fuse, FET, A06 bad) is omitted. Photovoltaic Monocrystalline Module The benefits of Solar Panels and solar power is that, once a system has paid for its initial installation costs, the electricity it produces for the remainder of the system's lifespan, which could be as much as 15-20 years depending on the quality of the system, is absolutely free! For grid-tie solar power system owners, the benefits begin from the moment the system comes online, potentially eliminating monthy electric bills or, and this is the best part, actually earning the system's owner additional income from the electric company. Photovoltaic Monocrystalline Module,Solar Energy Pv Module,Monocrystalline Solar Panel Module,Silicon Pv Mono Solar Module Jiangxi Huayang New Energy Co.,Ltd , https://www.huayangenergy.com
After the power supply is repaired, the test machine has a grating but a black band of about 5 cm on the left side. There are characters, the function of the button is normal, and there is no picture after adding the video signal, but the grating is slightly shrunk to the right, and a black line moves from bottom to top. I pulled out the speaker during the repair and didn't pay attention to the sound).
There is a black belt on the left side. I put the idea on the line pulse, but I found that there is no abnormality in the high voltage package 10 feet (AFC pin) from the 44 feet of 76931. Because it is a lightning striker, and there is no picture, the lightning strike memory is also the first to bear the brunt. After writing several times, the data failure has not changed, and it is determined that the super chip is bad. I ordered 3 chips online.
After a few days, baby arrived, I soldered the socket, plugged in the chip test machine, there is a grating, but the field is only about 10 cm, the field is not linear, the line is normal, plus the signal image appears, the new chip is bad. ? Trying 3 blocks is the same fault.
It is unlikely that the three chips will fail. Is it because I broke the chip and caused human error? Re-plug the original chip, the fault returns to the original state, the field is normal, the black band on the left. I didn't have a clue for a while, and I checked the pulse part, the power supply, etc., and I still had no results. I had no choice but to put the TV on the side of the TV. Fortunately, the chip is not expensive now, and I have ordered 3 pieces online.
After buying the 3 chips for the second time, the test machine can be the same as the original grating, and it is also the black belt on the left. The field is normal.
The brain is blank, is it that 7 chips are bad? The amplitude of the three chips is not normal, but the four blocks are not normal.
The code word is too slow, it is already 3 o'clock, and it will work tomorrow. Write the result: This machine is caused by two capacitors C404 and C408 lightning strike on the tube.
When changing to C404 and not changing C408: The first three chips are basically normal, but the image is jittery.
The second 4 chips had no image, the image was normal, but there was a black band around 3 cm on the left.
After replacing the C408, all 7 chips are normal. Without C404, it doesn't have much impact on the image.
There are 76813 chips with no pulse at 44 feet. The fault is similar to that in Figure 1, but there are no characters. I tried it on two P21SA387 machines.
I bought the first chip model 76931 H7L57L2E online shopping
The second chip model 76931 7L57L2-E was suspected at the time was not able to replace and the chip is bad. Because C404 and C408 fail, their faults are different.
After the TV is repaired, the 76931 7L55N7-E has been tried.
