According to the fault phenomena, question the fault scanning circuit part. Measuring found IC801 (TA8759BN) (35) foot (H.B LKIN, row blanking input) voltage of OV, not normal. Check the peripheral circuit as shown, found that the zener diode ZD603 breakdown, has a short circuit damage left row blanking signal power loss, cause the failure. Pick a 12 v zener diode after replacement, troubleshooting, reiteration (35) feet of the voltage at this moment, about 1 v TV condition.eRnservice manual download site