By asking the user that this machine has been repairing, replacing the tube socket, line output transformer and apparent put IC, etc., but failed to troubleshoot. Boot fast measuring regards put + B 210 v power supply and main power supply (140 v) are normal, observe the accelerometers uttered continuous lighter socket. Because the tube socket has been a new focus on check accelerate external filter capacitor and tube circuit, no abnormalities are found, remove the visual board electricity, lighter phenomenon remains. Multimeter is accelerating voltage exceeds 1000 v 1000 v block test, lighter phenomenon disappear at the same time, back to sweep line light grating, thus determine the cause of the problem is the accelerating voltage is too high. For line output transformer have replaced, at that time do not know how to start testing. Will suddenly think of is automatic brightness limit circuit is damaged, resulting in accelerating voltage is too high? Check components shown in the appended drawings, found R574 Ω (1.8 M) has been open, replaced and troubleshooting.vNWservice manual download site