Decoding (1) test piece IC601 (20 feet TA8719AN) presence of about 0.5 Vp - p chrominance signal waveform, without, with 0.01 u F capacitance jumper in IC601 20 feet and IC3001 (AN5858K) 20 feet, watching the presence of color screen, if any, should check IC301 and 20 feet and IC601 20 feet between related circuit devices: if still no color, should check C circuit board color/brightness separation circuit 4.43/3.58 switch IC3003 (MN4066B) and its peripheral circuit devices. DFVservice manual download site
 DFVservice manual download site
 DFVservice manual download site
(2) if IC601 20 feet signal normal (at this point about 10 v dc voltage, the 16 feet if chroma 20 feet, the voltage of about 16 feet 11 v), and then test the IC601 14 feet signal and voltage is normal (normal signal amplitude is about 4 vp - p, when PAL is 8 v, dc voltage is in NTSC is higher than 10 v), if abnormal, then IC601 was detected in 22, 23, 27 feet pattern recognition switching voltage is normal. Normal signal at the receiving PAL 22, 27 feet shall have more than 10 v high level, 23 feet should be under 6 v low level. If the abnormal voltage of this a few feet. Should check pin external RC components and corresponding subcarrier 4.43 MHz oscillation circuit devices, suspicious if this part of the circuit device is normal, inspect or replace the system controller IC602 (MN4066B), IC601. DFVservice manual download site
 DFVservice manual download site
IC601 26 feet (3) test for 4.43 MHz subcarrier oscillation signal, without abnormal or signal, check the crystals and the external IC601 25 feet of APC filter circuit related devices. DFVservice manual download site
 DFVservice manual download site
IC601 7 feet (4) the test voltage is higher than 1.7 V, if less than 1.6 V, shall check the color saturation of 7 feet external control voltage circuit related devices. DFVservice manual download site
 DFVservice manual download site
(5) measuring IC601 35 feet have no conduct flyback pulse signal input. Without an external circuit device should check the foot presence of metamorphic damage. DFVservice manual download site
 DFVservice manual download site
(6) measured IC601 60 feet and 62 feet signal is normal (normal signal amplitude are: 1.2 the Vp - p, 0.76 the Vp - p), if abnormal should check IC601 external circuit device and its associated pin.

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