There are two reasons cause relay not suck: one for the CPU from shutdown instructions; Secondly, protection circuit. Usually, the normal work of the main circuit is not on TV (standby), the protection circuit is not effective. If it is built-in protection circuit can't secondary boot phenomenon caused by the action, its performance is commonly and the second turning on the power supply after startup, relay should be off, then under the action of protection circuit and release immediately. But the fault is in not second boot is action of relay without absorbing, estimated the CPU is not a boot instruction. Wfjservice manual download site
 Wfjservice manual download site
In case of can't the second boot failure, measure the CPU (MNl874033TWY) standby control end 33 feet can't output on high level. According to the fault phenomenon and the above analysis, judge fault in the CPU circuit parts. Wfjservice manual download site
 Wfjservice manual download site
According to the inspection of three elements: the normal work of the CPU. Check the 5 v power supply voltage is normal; Try to change 6.0 MHz crystal vibration is invalid; 54 feet voltage measuring CPU reset end, failure occurs when the 1.95 V, obviously not normal. Check the reset ICl212 (MNl280 - R) reset signal output voltage of 2.05 V 1 foot, and (2) feet 5 V voltage is normal. With CPU54 ICl212 (1) the feet only 100 Ω R1153 between resistance (see chart), during normal working voltage should be the basic equal on both ends and close to 5 v, analyze internal circuit of damage or the CPU @ the feet by capacitance C1251 leakage. Remove the C1251 detection has obvious leakage, after change new troubleshooting.Wfjservice manual download site