CONVERGENCE IC'S Visit Plasma LCD Repair Page
Convergence IC's are used in circuits that align the Red, Green and Blue pictures on top of each other. Defective IC's produce a distorted picture with extreme colored outlines. 3D TV
The convergence output amplifiers may burn out from a "bump" in the 120VAC power caused by lightning or large motors, etc drawing loads. The bump causes the High Voltage on the picture tubes (there are 3 in your rear projection TV) to rise or jump a small amount, from 28kv to 28.5 kv. A small arc occurs for an instant between the picture tube HV connector and the yoke around the neck of the picture tube or the ground frame.
One small arc causes little damage. Over a number of years the accumulation of many "arcs" finally causes the output amplifiers for the convergence circuit to fail. This is the part of the tv that controls lining up of the red blue and green pictures. The Convergence Gallery shows images of different types of convergence failure.
Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and eliminates coloured outlines.
This is the most common fault in all makes of rear projection TVs.
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