Fault phenomenon: After the second boot, the raster of the screen will appear, but the screen will automatically shut down when it has not been fully loaded. At this time, press the standby button again, and the power switch will be turned off for a while and the fault will reappear.
Repair process: B1 (130V), filament voltage, video discharge voltage, +8V, +5V, ±14V voltage are normal at startup. The 3 foot (field protection input) of the 8879CSBNG6K02 is measured at 4.7V for the second startup and standby. Normally, it should be high during standby. After the second startup, it will drop to 0V. It can be seen that the TV has entered the protection state. Check the Q015 (TC144E) along the 3rd leg of 8879CSBNG6K02, and then check the components connected to the b pole. It is found that R030 (18K1/8W) is open circuit, replaced with a 20K1/4W resistor, test machine, and troubleshooting. R030 is connected to the deflection yoke via C025 (10uF50V).
The following circuit diagram is drawn according to the board:
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