Color grating, is usually due to decode circuit, depending on the circuit and at the end of the tube failure, caused by an electron beam current is too large. 4e7service manual download site
(1) at the end of the first three visual measurement tube collector voltage, and green at the end of the tube of 85 v, the other two tube for about 140 v. To test the three depending on the tube at the end of the base voltage, and green at the end of the tube is 8.5 V, the other two tube is 7.9 V. Note decoding IC501 attending the foot voltage rise, make the green beam current increases. 4e7service manual download site
(2) will decrease R523 IC501 19 feet over the ground resistance (parallel resistance) pull @ foot voltage to 7.9 V, to adjust the white balance. Due to the small G - Y signal amplitude, so bright white balance is not ideal. This is only an emergency method, to completely solve, only change new M51393 integration.4e7service manual download site