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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Unplug,replug the tv to reset it self?Not.Take the tv aparts.Power supply board have dead parts,call capacitors,check power supply board,that the board have a a/c power cord plug into it.That the power supply board.Know basic electronic's?Know how to do soldering,have tools like soldering iron and solders?Check power supply board for those dying capacitors parts,alway bulges up on it tops or puff up on it tops.These capacitors must be replaced in the power supply board.Now the tv shuold have stable ur power light and work.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
The buzz is the power supply attempting to power the set. The click is the unit shutting down. Can you pleae post the make and model as well as whether or not the standby light is blinking? With that info we should be able to give you some options.
Unplug the TV Remove the cover wait until the TV cools then plug in, turn on and, it should come on... if it does; purchase a computer fan to cool the chassis of the TV wire it into the 12 volt side of the power supply and, install the cover
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
They are dropping like flies -
Just posted this for the same set:
The sound; is it a click or a sharp snapping sound? The first can be a relay turning on, the second is most likely related to a high voltage discharging. If it is a relay, then the set could be trying to protect itself from an overload or the power supply has failed; the blinking ON LED is pointing toward that. If it is a high voltage discharge (you may be able to see it through the vents in the rear housing) then it is possible that an accumulation of dust and household airborne contaminents has created a path that can be removed with some targeted cleaning.
what do you mean "knocked" Yes sir it sure does sound like the power supply specificly the stand by supply? Only real way to tell if you know anything about troubleshooting solid state electronics is to get a schematic and start at the beginni9ng of the supply and work your way over to the sweep supplys. On alot of sets the horizontal has to be good for the ,main switching supply to start up but in this case if it dosent click or make any sound I supect the main supply. Good luck