Question about Sharp LC40D78UN 40 in LCD TV
In this tv the brightness of the screen is actually generated separately, by a set of CCFL / neon tubes. These tubes are powered by an special board, the inverter / ballast one. If the brightness oscillated it means that the high tension generated by the ballast for the neon tubes oscillates - an indication that either the board is faulty or something has gone wrong with the power source of the tv - it cannot longer deliver the necessary power to the ballast board.
To find out what is wrong the voltages in the power source and ballast board must be checked, the faulty board identified and replaced. That requires a good knowledge of electronics, you will probably have to call a repairman.
Or you could just replace the boards and hope it fixes it (like they do in most shops anyway)
Posted on Apr 06, 2011
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Posted on Jan 02, 2017
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