|LG 42LH3000 Television|
It was worse when the TV was first switched on but got better as it warmed up. Over time it gradually got worse until no picture was shown on the left side at all. From an Internet search it seems that it is a common problem where the LCD driver transistor array die bonded to the flexi-circuit along the top of the LCD loses connection. These devices are driven by the Tcon board at the top middle of the TV via two flex-circuits, these connectors were checked for bad connection but were fine. It was later found that the flex-circuit transistor array on the far left of the LCD when pressed gently would fix the screen problem. A couple of thin cardboard spacers were cut and placed under the flexi-circuit transistor array ( I did this for all the arrays just in case the problem occurred on the remaining arrays ) to make it press more firmly against the silicon rubber pad on the removable front metal frame of the LCD. This helped ensure that the array would be pressed firmly by the silicon rubber pad when the front frame was replaced and the screws firmly tightened. I hope this helps someone with similar problems and thanks for reading.
Remember that TV's have mains voltage and also higher voltages for the cold cathode strip lamps exposed when the rear cover of the TV is removed so be careful. You may by fiddling with these transistor arrays make the connection problem worse, but if the TV is already toast what have you got to lose.