3, according to the procedure quickly checking techniques fail inspection , even without using a multimeter , there are several faults can be used to narrow the scope of the inspection techniques.

( 1 ) Voltage (ac6.3 ~ 220v) injection method using mains ripple 50hz sine wave or rectified as the injection signal source .

( 2 ) signal tracking method a, using high-frequency signal tracking and detection tester , this method is commonly used in the tuner , image or audio amplifier circuit circuit to be checked. b, inside a TV signal source used as a signal source are: ① a second sound IF signal 6.5mhz : the color subcarrier signal amplification system for checking color TV . ② use sound signals ( buzzer sound ) : Used to check the sync separator and amplifier circuit . ③ color subcarrier oscillator voltage: for checking the color sub-carrier of color television signal amplification system . ④ Power Supply Ripple: for each amplifier system checks the TV.