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Hi , I`m JackPerhaps I can help you with this problem , a few questions coming up and please note that it may take a few minutes between replies;
When this happens , is the tv still working normally or is it in shutdown ?
Sorry , was locked on another post when you replied.
Did not see anything in your opening post about a blank screen , that's why I asked .
Now when you say blank , do you mean a dark screen or just no picture but lit screen ?
That code is not good I must say , in the service manual it is labeled as PNL_ERR , panel error / and that points to the built in lamps /CCFL`s
In other words the lcd panel is acting up , this is considered a HIGH failure .
Does it seems to get worse with time ?
Only possible other culprit in this case would be the inverter board that drives those lamps .
On an intermittent problem like you have now the only way to know for sure is to try that board or to wait until complete failure .
If you are interested I will find that board for you and if you or a friend is handy with a screwdriver then this is Plug&Play , no solder or adjutments and no special tools required , just a Philips screwdriver
Here is a link where you can get that board part #RUNTKB116WJQZ for $50 ;
By the way , never mind the model number listed there , that board is found in the models LC-60LE857U, LC-60LE750U, LC-60LE755U and more
Here is another one ; http://www.ftvparts.com/products/sharp-runtkb116wjqz-power-supply-dps204ep-1-a-2950322102.html
Let me know if you have other questions and if not then please do not forget to rate by clicking on the star icons at the top, then click on Submit so i get paid for my time helping you .Also note that it will not close this post , you can come back here at any time if you need further info or help . Thank you