What's the problem with the color TV not vibrating?

Line fault is a typical fault of CRT color TV. The main reasons are: First, the AC short circuit of the high-voltage package (about 5%); Second, the power supply of the collector of the push tube is abnormal. Common faults are limited current resistance open circuit (5%) or filter capacitor breakdown (5%); Third, abnormal magnetic field output causes high voltage protection. It can be determined by measuring the field deflection voltage. If it is about zero volts, it is basically normal (5%).

The above reasons account for 50% of the non-vibration of the line, so the remaining 50% are the most critical factors: line oscillation and power supply failure before propulsion. The line oscillator circuit is integrated in the module 9370, and 8~9V power supply is provided by the 14 pin and the 39 pin. Measure whether the voltages of these two pins are normal. If it is not normal, check the previous stage, and you will soon find the culprit and solve the problem.

Tip: Generally, the 7808 three-terminal voltage stabilizing block is easy to be damaged.

I wish you success!