CONVERGENCE REPAIR EXPLANATION
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When A REAR PROJECTION TV has coloured outlines or a 3D image the Convergence Circuits most likely need attention.
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 28.5kv. 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 little 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.
Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and eliminate the color outlines.
This is the most common fault in all makes of rear projection TVs.
Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design. The poorly designed products require a "bench" repair that can typically cost from $350 to $700.
Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail.
Total cost is usually around $250 for an in-home convergence repair.
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Let me know the make and model, a description of your fault and if you have the manufacturer's remote hand unit. Also let me know your address, phone number and a convenient time for service.
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