Sharp LC-70LE600U. Went blue screen on me. I've replaced both boards and still blue screen. Nothing working

SOURCE: power supply bad on Sharp Aquos LC - bad board - schematic to ID?

Buy the green light going on means Standby is ok. Next, would be to locate the plug coming from the main board to the power supply and find the post that says PO which means power on. With your meter on that post, press the power button as see if the reading goes High, if it does then the main board is able to turn on the power supply. Next, find the plug on the power supply that goes to the inverter( the long board on the side) remove it and see if you have 24 volts coming out of the power supply when you press the power. If you do, then the inverter board is bad, if you don't have 24 v, then the power supply is bad. There are NO diagrams available for these set other than a flow chart if you can find one. A regular svc tech does'nt need a manual for these anyway.

Let me know how you do Kathy ?

SOURCE: lc-26dv20u has no picture

Is the screen blank and illuminated or dark without any video?
This failure could be due to a defective backlight inverter board or the power supply might not be providing +24 volts.

SOURCE: sharp LC 42D62U has sound no picture

Most likely the CCFL inverter is bad.

SOURCE: my sharp lc 32d42u shut off and won't turn back on

IF YOU STILL HAVE SOUND I AM PRETTY SURE WHAT THE PROBLEM IS...

SOURCE: Flickering screen (LC-52SB55u) with HDMI

Do a quick google for this on the AVForums site where you'll find numerous threads covering this problem. First, select the HDMI input before turning on the blu ray player. The handshake over HDMI is the problem. I have the same problem with a Technika blu ray which is fine on my other TVs.
If this doesn't solve it then you ned a firmware update which can be downloaded from Sharp's website and installed using a USB pendrive or by PCMCIA card from Sharp if you have an older model with a rocker on off switch and no USB update port on the back of the TV.