IT WAS TAKING ABOUT 5 MINUTS FOR PICTURE TO COME ON NOW NOTHING

Hi,
I think your Display card not proper work so please contact LG Technician.

Thanks.

Check for the correct voltage intake the capacitor needs to be replaced as its a very old ones need to be replaced by new one.

Need the model number of the set and also if any lights on the TV come on or blink when the picture goes out or not.

U replaced the bulb four months ago still under warenty.Need a bulb again then ur whole light engine might not good.

well if you replace the lamp 2 months ago this could be a ballast issue go to your back of the TV and if you ear a weird mechanical noises like a tick,tick when you are down there this is the ballast.
Regards

Well I hate to be the bearer of bad news but besides the convergence issues you have a bad red picture tube. Us techs refer to your problem as a 'floating grid' in the red picture tube. More bad news is that the tube is no longer availible. The only solution is to have a professional remove the red tube assembly and ship it off for rebuild. A company called Video Display does this work reasonably and I've sent several to them with great results. It takes about three weeks and the whole repair is very spendy, around $400 to $500. Sorry for the bad news.

I've found the lines caused by the digital board before. Unfortunately it is expensive. I'd recommend running it on HD and it will bypass the faulty circuit. The lamp light flashes telling you the lamp is firing up. As the lamp ages, it will take longer and longer until it fails.

There is a list of things you need to check, but offhand I'd say that the 5 volt line is low and probably right on the"edge", which is why it works sometimes and not others take a look at this list:
Cause #1
1. (Lamp may light and go out) suspect bad lamp part # 915P020010 2. Check for
12-volts DC at J-9 connector pin 4 on the Engine Driver PCB, if missing check
for an open F9A09 on the Power PCB, if it is open replace F9A09 part #
283P127060 and the Light Engine part # 939P977010 3. (Lamp may light and go out)
Check for 5-volts DC at J-9 connector pin 1 and 2 on the Engine Driver PCB if
low or missing check C9A37 and C9A38 both 3300 UFD 10 V part # 181P732040 on the
Power PCB (part # 930B921002) 4. At power on the lamp turns on and off three
times and then the unit shuts down with a red lamp LED (lamp error). Replace the
Light Engine part # 939P977010 5. Lamp enable line at J14 pin 6 does not switch
to 5 volts after turn on, 12 and 5 volt supplies are good. Suspect the Light
Engine part # 939P977010 6. Lamp enable line at connector J14 pin 6 on the
Engine Driver PCB switches to 5 volts after turn on and does go to 0-volts (low)
after 5 seconds, 12 and 5 volt supplies are good. Suspect the Lamp Power PCB
(ballast) part # 939P978010 7. Lamp enable line at connector J14 pin 6 on the
Engine Driver PCB switches to 5 volts after turn on but does not go back to 0-
volts (low) after 5 seconds, 12 and 5 volt supplies are good. Suspect the Light
Engine part # 939P977010

I would say try #3 first, the two caps on the pwer supply board. A couple of warnings: as always, unplug the unit before servicing. The power supply is located on the left side, if you behind the unit. It is in a shielded box and the shield has VERY SHARP EDGES so use care when you try to open it or you will slice your fingers.
Please be sure to rate this solution. Thanks!

I had the same issue. Replaced the lamp and now mine is working. Normally this is a sign that the bulb is out, however - I would say now that either:
1. Your lamp is defective.  2. The balast in your TV is defective. 
I would check out Discount-Merchant.com - they can help.

My mom and dad had this problem, after replacing the bulb everything is working great again.