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See if Sharp's customer service still walks customers through what is called an INIT or factory reset. 800-BE-SHARP. Make the television do what it does when it freezes up and then call. You might just need to scrap the television because if you need another main board the part alone will cost around $600.
Checked Freezer Fan is working. Also checked defrost Fuse in freezer.
To checked freezer fan is working or not open freezer door press Door Switch and checked Cold air is coming from duct or not.
The power of the set seems to stabilise after the set is put on and then only triggers. So to confirm on this remove the back cover and heat up the power section, the controller section, the processing stages, till the set power up then confirm once again to allow it to cool, use a freeze-it spray to enhance the cooling. Once you pin point use a soldering iron to heat the speciific component to confirm, then replace. It can be even dry soldering , if so do a touch up job . Do it carefully without bridging any circuit. Good day
I agree with everything that they are saying.
Most tv companies under design the cooling needs of the flat panel TVs. I had to fix a few TVs this way that had similar problems. Mostly with the picture on TVs freezing up because of the poor cooling design for the motherboard processor. I would give their solution a try before replacing circuit boards.
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