LG model:RU-30FZ13 chassis: MC021B
No picture and no sound, standby light on.
TV turn on, I ear relay click, power supply smps turn on, 135 volts B+, 3 secondes later, supply turn off.
Checked solders on PCB, Good!
Standby supply, Good!
No short on smps, no short on HV circuit.
I raised the control line ON/OFF from microprocessor IC01, power supply turn on and stay on, all supply voltage Good!
I suspect the microprocessor (50$), but not sure.
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Unplugged the unit the power outlet for about 60 sec.Then power it on again. If you have surge strip along the line. You should directly switch in on power outlet only. If this doesn't help.
As the relay is working you have power in standby mode. Check its supply voltages if its ok. Secondly you can check the the B+ supply it is in DC, If this is a crt type tv, check its horizontal output transistor, Check its flyback for short circuit. Capacitor near to it rated almost 800V, and deflection coil.
check for an open resistor on the power supply, it is actually a fusible resistor, (white) if open, then check the converter, some sets have two separate and some have it as one. it will be on a heat sink on the power supply. if shorted then check for a shorted horizontal output transistor and repair cold solder joints on the horizintal drive transformer which is the real cause of this problem