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I assume by a blue line you are seeing a seeing a single line left to right across the screen. If this is the case it is a failure in the vertical deflection circuitry. There is no simple repair as a part or parts have failed. In the event of a "power surge" there could be a number of components affected. The unit would really need to be diagnosed by a competent technician. I have worked on many of this model and they are certainly repairable, but probably need two people to move it as they are very heavy as you know. I would get an estimate on the repair and make a decision based on that.
a free diagram will be very difficult to track down with that specific model. is it CRT or LCD or Plasma? your best bet would be to find a couple repair diagrams for tv's of similar type (google "tv repair diagram and scroll through the image search results.)
if it is a CRT then it won't be too bad, as they are pretty universal in the way they're built on the inside, so looking at a couple CRT repair guides should yield a good idea of what to expect, what might be moved around, and what stays constant.
your next option (which i am sure you are aware of) will be to call Sharp and request one from them, and it will most likely come with a price.
is there a specific problem with the TV that prompts you to need to disassemble it? perhaps we could better help with a specific problem. if you're taking it apart for fun, skip the diagram and jump into it. inside any electronic will just be circuit boards mounted to parts of the frame and a tv tube in this case, so you really can't harm anything by gently taking it apart. putting it back together is a matter of fitting the square peg into the square hole, so-to-speak, as the boards won't fit properly on any side other than that which they were removed from. cables are the same way.
hope this helps a little.
If this is a TV with a CRT (glass tube screen) then this pattern will be caused by a residual magnetic field in the shadow mask (the metal bit at the front behind the glass). Normally when a TV is turned on from cold a set of wire coils demagnetize (or degauss) the set and clear these patterns. If this circuit is not working you will have to take it to a repairman and get him to do it manually (or the shadow mask in twisted). In future handle the set with care and keep it away from strong magnetic fields (vacuum cleaner motors, etc).
Chirping or hissing from the TV is caused by a faulty CRT base socket in 95% of the cases. Replacing the base socket is an easy job, but care must be taken to get the same replacement base socket. You better desolder the existing base and take it to the shop to get one with the similar connections. Good luck.
Based on your trying of different remotes, your conclusion is basically correct, however, it is very rare for the infrared receiver to go dead (or at least the sensor itself). Should this still be the case, there is no other way but to open the TV unit. Since the placement of the infrared receiver is to the front of the TV, chances are that what your are thinking "take the entire set apart." is the only way to do remove the infrared receiver.
A guess would be the sensor which normally is available even in RadioShack. Your best bet may be to seek the services of a qualified professional willing to undertake component level repair rather than modular/PCB replacement. At times it may just be a loose connection inside the TV or no low B+ to the infrared receiver module/circuitry.
Alternately, you can try to "borrow" an original remote and see if that will work just to really confirm. Some instances of this problem in some other brands/models got solved by resetting the TV (unplug for a couple of hours).
Hope this be of some idea/help. Pls post back how things turned up or should you need further information.
Good luck and kind regards.
Well its not a good Idea to carry a TV set turned upside down because of the heavy parts mounted on the board could cause stress and crack the printed circuit board. This what most likly happened. The PC board is cracked. If you have no soldering skills and do not know how to work on printed circuits or solid state devices, you should seek the help of a pro to assist you in this repair. Good Luck.