Model: N41C6B Fault phenomenon: Does not start up. Inspection: The light comes on and then goes out. When the power is turned on, the +B voltage is 100V, but it soon drops to about 5V, and the light does not light up. When the +5V voltage is measured, there is no voltage. After the Q820 transistor C8050 is replaced, it does not work. After disconnecting the CPU +5 power supply pin, the +5V is normal. After replacing the CPU, the fault still exists. Later, the R810 1201C resistor was checked for deterioration. The resistance value is not large. After updating, the fault is eliminated. R820 should be 120K W/2.
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