First repair fault, green screen measuring video, chromaticity, line field scanning circuit IC601 (AN5601X) pin voltage, found three primary output end (21), (24), (25) the voltage up to 8 feet v, no further examination found IC601 attending foot 5 v power supply. Check the 5 v power supply circuit, found that the zener diode breakdown, D601 after new image, but the grating on the left there is a belt of interference, due to the presence of no change of shape and position of signal interference, so doubt a bad power supply, checked and found that the 12 v power supply filter capacitance C810 bad, after change new troubleshooting.zxfservice manual download site