My screen has blotchiness in the blue areas when first started and goes away when warmed up after about 20 min

Check oil may have low oil shutoff and drain gas and start with new

The ticking noise could be a faulty hydrulic valve lifter. When last was the oil & filter changed, it coul be that the oil is thick and not going through to the lifters and when it warms up the oil is thin. It could be that the engine is need of an overhaul as 148.000 miles is 238.182 Kilometers and that is a hi milage.

This seems to be a problem with some older panels. If you are prepared to tackle the problem yourself then try the following.
WARNING there are some very high voltages within the TV which can be LETHAL so the greatest of care should be taken.

With the back of the TV removed, use a hair dryer and apply warm air to all the ribbon cables in turn until you find the one which causes the fault to disappear. Now turn your attention to the faulty ribbon and remake the connections as necessary.

What is the exact model number to your Sharp TV?

It might also be a bad solder connection, short of checking voltages what I have done in this type of situation is with back off use a small fairly high speed fan - a hair dryer set to cool works, to cool areas of the boards inside to localize which board is causing this, with the set in failure, got it? it goes out cool it with a handheld hair dryer with air set to cool, when you find the spot where the problem is it will either instantly come back or try to.

Do it a few times to confirm which board is bad and locate a replacement board and swap it out.

If the OSD has display and after a min goes dark that monitor has 2 possible problem. 1. bad electrolytic capacitor from secondary power supply to inverter area or fault semiconductors around inverter area. 2. Bad CCFL or fluorescent lamp of lcd panel it may be reddish color.

I had a similar problem and got a TV repair man to fix it for real cheap. The whole fixing took less then 30 min and he goes to your house to fix the TV. He fixed it for an excellent price that left us astonished. He lives in NY. Email me if anyone needs his contact information. You wont be disappointed.

it could either be a lcd control board or a main bd causing this problem
im not sure you can get either part as of now

you need to replace the optical block assy

Thats the car telling you that it is not warm goes off when the engine warms up