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Tv have major problems if have a power surge could be anythings it is dead on the tv highvoltage deflection circuitries sections area of the tv.Must have be major troubleshoot and replaced boards or components parts.Tries more tv shops for Techs,for better prices to repair tv set.Or tries Ebay.com,Amazon.com can buy any Refurbish 40" LCD tvs around $700.
There might be a failure on the power supply or horizontal section of the TV even if you see some light inside the TV. Some of the voltages could be missing and that is why the TV fails to power up.
If you know how to use a multimeter, you could check all the fuses from your power supply.
Unplug your TV from the main AC line if you intend to do it yourself.
You will know how much you can do or it might safer to contact a tech.
Let me know if you need further assistance
Ur tv have a problems known as a convergence problems,it dead.The tv convergence board require changing 2 STK convergence ICS and some or all it resistors to solved the tv convergence problems.The shop will cost u $300-350 for parts and labors.
i'm no expert by any means; but I wonder if it could be as simple as the reflective screening on the inside comming loose. I have a 65" and I took it apart to clean it. The reflective screening looked to me like it could be a weak point. Just a thought.
Before doing anything try upgrading the software first and see if that cures the problem. Call 1-800-HITACHI to get the latest version sent to you and then just follow the instructions. There is a port on the back of that unit where you will insert the MMC or SD card they send you and the update commands are available in the customer menu...
You might've done this already, but first I would try the "Magic Focus" The button can be found all the way to the left of the buttons panel on the tv itself. If that has no effect, try playing around with the settings within the tv. Click menu on the remote and see what happens when you try settings like color, balance, and contrast.
Sounds like you have a short somewhere, probably the Horizontal Output Transistor. If there is a fault the led you mentioned probably should be blinking. You probably are going to need a tech to look at this as it is a very complicated process of elimination.