When you first tv on and press the power button the indicater light blinks 18 times then stays on solid green. The backlight comes when the light is steady green. There is no picture or anything. Nothing happens when you press any buttons except power button that turns off the tv. There are no blown caps on the power board. I also checked all voltages coming out of the power supply and they are within specs. So wondering what else it could be?
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
SOURCE: how to reset lg lcd tv
Whe you press the power button the TV led have to blink several times and the it have to change to blue, meaning Tv is on.
If you press the power button and the led start blinking and goes off, then you need to replace the mainboard because it is damaged.
Bye
SOURCE: 42" LG 42LC2D HDTV Will not turn on
Hi, sounds like a power supply problem, most likely needs capacitors replaced, costs about £5 to do it yourself, and a fortune in the repair shop, easy enough if your handy or know someone who is,its worth a try,it'll be going in the bin anyway, cam
SOURCE: LG 47LC7DF LCD TV turns off with a pop then turns back on.
Sounds like a overheating issue. Try facing a large fan blowing across the back of the unit and see if this changes anything. If it does, it might help to blow the back out with compressed air as dust might be helping it overheat.
SOURCE: LG 47LC7DF Green Light Blinks 16 Times - No Picture or Sound
The lights indicate what the issue is. Kind of like your check engine light in your car tells you something is wrong with the engine.
SOURCE: 47LC7DF, Green light comes on, blinks with remote
When you say that you have replaced the main board i assume you mean the power board? If the green light comes on and blinks when the remote is touched it was never a issue with the mainboard, if it was you wouldnt have any signs of power. In most lcd tvs you have the main board which is normally the power board, the signal board which recieves signal and hold settings of the tv which can be all in one, the other is the inverter board, which scrambles the signal to what you see on the screen, and next we have the back light which lights the screen so you can see the picture, sometimes in certain models as i have learned you can have power/inverter boards which means the inverter and power are all on the same board, in your case i pressume the inverter board is seperate board and probably the issue you need to address, you can buy these online probably the same place you got your new mainboard from. Hope this helps pls post bach what happens.
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