During the viewing process, a TCL color TV HID29276PB TV suddenly heard abnormal noise and smoke inside the machine. Remove the main circuit board of the machine and find that the R419 on the board is burned. Check the data to find that the resistance is 1K (0.125W), which is the ABL output resistance of the high voltage package.
Overhaul process:
1. Replace R419 with 1K (0.5W). After installation, power up. When the TV high voltage starts working, the TV will smoke again. After inspection, in addition to the R419 burned, it also burned R425, R426.
2. After replacing the above three resistors, the line tube drive circuit and the power supply voltage output are detected again. No abnormalities are found, and the three resistors are burned again.
3. When the maintenance is impossible, I enter the forum to find the maintenance experience and send a message for help. With the help of everyone, I sorted out a little bit of my own. The drive circuit of the row tube and the control circuit of the ABL's video panel were re-detected, and it was found that the RN425 resistor of the video panel was also burned.
4, the Internet back to a high voltage package (model: BSC29-0185V) and a video board (model: 40-29206P-DIA4X), a total of 64 yuan.
5. I just received the piece this morning. After I installed it, I started the test machine. The machine has a sound, but the black screen, the three resistors are no longer burnt. Depressed, is there a problem with the board and there is no problem? I intended to shut down and unpack the board. I suddenly found that there are 3 adjustable potentiometers on the high voltage package. I tried to adjust the SCR potentiometer with a small word knife and found that the TV has an image. After adjusting the SCR and FUS potentials. The image to the image works well.
6, the whole machine is finished, the power test machine is still here, the machine is normal.
Maintenance summary:
The original fault of this TV set should be caused by the damage of the high voltage package, which caused the ABL voltage output to be abnormal, so the R419 was burnt. Later, due to the replacement of the R419 caused by the replacement of the high voltage package, the R425, R426 and RN425 were burned, so the peers If you encounter this situation again, do not replace R419 casually, otherwise it will expand the scope of the fault.
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