This problem exists in the samsung's liquid crystal display is more, generally appear in the Internet cafe and commercial units use the machine, the mainly part of power supply filter capacitance in high temperature environment for a long time use, capacitance bulge capacity, volume smaller, + 13 v power supply ripple coefficient is bigger, effective value is reduced, cause high pressure plate over-current protection. 6E4service manual download site
 6E4service manual download site
Some display because guard point is different, will still be able to work normally, high pressure plate part of the driving field pipe under the condition of the flow to work long hours, too much heat and thermal breakdown, which in turn causes the power load short circuit, and lead to can't normal on/off. 6E4service manual download site
 6E4service manual download site
 6E4service manual download site
Appear the problem of machine with samsung 540 n, 740, 911 n, etc., mainly is two 8201. 25 v/F and a 330 mu F / 25 v capacitor, maintenance can be respectively used 1000 mu and 470 mu F/F / 25 v 25 v capacitance substitution. 6E4service manual download site
 6E4service manual download site
If high pressure plate above the field tube breakdown is damaged, you can use the N/P composite field tube (such as 4532, 4606, etc.) substitution.6E4service manual download site