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it could be bad power supply for the screen or a short in power wires for screen very rare. what is common is that the 4 small power wires to lcd screen it self have been pulled loose. the internal power supply wiring goes to screen through a small 4 pin connector to the screen which is easily broken if pulled on. that connector has to be gently removed with small screw driver prying it off by on the 2 sides of connector. it if not the wires pull loose if pulled on which would be giving an off on effect. so my diagnosis is that the lcd screen was replaced previously because of common touch screen not working. in process of replacing the screen the power wires were pulled loose and difficult to install back into connector tightly. I can sell and send a working screen assembly for 700.00 and will send 350.00 back after you return the broken unit. 99 % I can repair the broken unit you send back. . I have replaced dozens of screens and pulled the power wires out the first time myself so quite aware of pitfalls. . also the replacement unit I will send has a 2009 lcd screen in it with touch screen defective solder removed. i am sure the screen you had replaced is just another 2006 7 8 lcd screen which will fail again as far is the touchscreen touch not working. problem

First off...Welcome to The Greatest Lexus Forum in The Universe....I will see what can be done for you. Relax :)