Received a Hisense 21-inch color TV! After the boot, the screen is all blue, and there is a diagonal retrace line, the screen keeps flashing a bit! But sometimes it shows normal, eliminating the phenomenon of virtual soldering! ! The red and green guns basically have a voltage balance of about 160V. The blue gun is very low, only a few tens of V. The check panel has not found any problems. The problem is that the RGB signal input is basically balanced. Both are at 2. V, and the RGB input cable is unplugged. The boot is still blue screen plus retrace line! I soldered the resistance of the string into the blue gun and the image appeared yellowish! Masters, is this phenomenon a blue gun? If so, what should I do? I heard that it is possible to take the voltage from the line and then connect it to the blue gun filament. What should I do? Is it polar? Thank you, the masters. Actually, since I started cutting the blue gun resistance yesterday, I started to go in the wrong direction. I have insufficient experience! If it is really a blue gun, after cutting this resistor, it should still display blue and have a retrace line, but the machine shows a yellowish! So the problem should be in the video or decoding circuit! I went to the boot this morning and finally let me discover it. The blue gun was put on the CE foot and actually jumped on fire. It seems that the video board is carbonized! Excited to handle all the carbonized areas of RGB and then turn it on... Stupid... Now it becomes full-screen red and has a retrace line, which confirms that the circuit is not connected wrong! With the first mistake, the second time is unlikely to be the same mistake...hehe... Self-healing Hydrogel Screen Protector
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Cut the R signal input resistance of the video board, the red power disappears, solder back the resistor, continue to check forward, cut the R cable on the decoder board, the boot fault remains! This proves that the R signal is not sent from the decoding circuit! Now the rest is only the cable is not checked, take a flashlight... Your kid, it turns out that you are playing a ghost.
Summary: Although a lot of detours have been taken, the value is! At least let me know how to check for similar faults in the future. From what aspect, what causes it, whether it is the picture tube or the decoding circuit, the video board or other reasons, how to deal with the last, most It is important to learn to suspend the filament under the guidance of the masters. These are not easily bought with money! Thanks again for the help of the master, thank you! I will definitely share it with some good experiences in the future.