Turn on tv, it says please wait, the picture comes and goes black immediately. Got sound, but no picture.

Start simple by using different cables, whether they be HDMI, VGA or standard COAX cables. They could be losing the connection. Also, it's possible the power supply is wearing out and it gets too hot. You might want to simply try some spray air duster type thing to clear out any dust that can make it hot.

also check the power cord wire coming from the back of the tv is loose from the tv side or perfect.

unless your very savy no. I have taken apart tv's monitors and found the swollen capacitors and replaced them. Sometimes though its not that and then you have a tv ripped apart but what have you got to loose if its already not working

It sounds like something was going bad on the main board and it totally quit now, try replacing that

If you have electronics experience - check the power supply and make sure you are getting the correct voltage to your inverter boards and main av board - also do you see any movement on the screen take a flashlight and shine on the screen - if you can see a dark image on the screen check inverter boards and power first.

thanks,

michael

Could be the signal board has a bad cap, in this case it sounds like you are getting intermitten power to the inverters....when the tv goes down and of course you have audio....Shine a flashlight on to screen and see if you have a picture...look carefully. If this is the case..you have the above problem!

My LG TV
switch on no picture but short period of sound then nothing

Call 1-800-237-4277

try changing the channel with the original remote or by the tv's physical controls. It sounds like it has switch to an AV channel.