You Need A new bulb, its going to pop any minute, you will literally hear a loud pop like smashing a lightbulb. Order one now online, cause it really sucks when you have to wait a week for a new bulb. There easy to install yourself, very simple. Calling a tv man would be a waste. You can fond a bulb online for around 90 to 150, anything over 150 is a rip off, look somewhere else.
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If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
This is probably the back light going out. They have tube lights in them and they do fade. You might notice the picture getting yellow too. This is not something that you can repair yourself unless you know electronics.
I have the same issue, its caused by the program powersaver when running an HDMI port. if you turn on the TV and your HDMI device close to the same time the info transfered between them tells the TV that the HDMI device is in sleep mode so the tv starts dark then fades black to save power. easy fix, turn on either the tv or HDMI device and wait till it is fully on before tunring on the other.