My 3 capacitor have blue colour dot. there is no swelling seen only dot so they are bad or fine

Bad connect so you need find it

Loss of Luminance signal. Actually this fault is related with its main board. Contact any service technician.
Gopakumar Gopalan Google

ive seen this happen on a unit that start ckt capacitor was going bad (swelled) it finnaly gave up and started no more , if unit is more than a few years old then seek a replacement as if start ckt is really at fault here then a overheat condition could result , this is not safe to just leave unattended

Hello, Sounds like an LVDS Cable or T-con Board.
Usually this will slowly get worse until it is repaired. It is caused by a failing T-con (Control) Board or connecting cable. T-Con Will Need replacement. This picture show's more extreme T-con board failures

I had the same problem. tonight im watching my TV again. I changed the capacitors on the power board that were swelling and it works fine. Less than 30
min. with some soldering skills.

www.youtube.com Lcd tv capacitor repair is what you search for , You have a bad capacitor , usually on the top board . on the left hand side. the video's will show you how to replace them and also how to tell a bad one , your problem is that a capacitor is bad and when it gets hot it cuts the power due to swelling.

sounds like a large capacitor has gone on main board
check for swelling or bulge/can be square blue in colour

Sometimes the voltage can be set to high by the factory. Throughout time, blue dots will appear. You will have to remove the back cover off the tv, find the "voltage Screws (they are labeled) and turn down (left) JUST A Notch. Have seen this done many times.

Pray that the panel isn't blown out or bad projector tubes. They are expensive.

Blue dots and screen flicker are VERY common on the newer LCD and Plasmas

Also, if you have a pixel setting on your TV (not sure if that one has it) Try setting it to 480p.

if the dots are pixelated, you have an lcd issue (or if you have a dlp, it's a dmd issue). if it's not pixelated, try to focus the lens on them. if you can, it's dust. blow it out with canned air.

Yes seen new color cartidges bad. Machine new should be under guaranteed also if cartridge does not work...