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Vertical Bar on JVC VM42WV74

Vertical bar full height of screen. Present most of the time but not always. Took it to repair shop and tech says it is a component that goes the full horizontal length of the screen but refuses to name component.

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A vertical bar can be caused by a number of things. A couple of possibilities:
1) Bad connection to panel at that vertical location.
2) Defective processing chip.
3) Bad panel

Any of the above could be the problem. Some experimentation and measurement would be necessary to determine the exact cause.
Dan

Posted on Apr 09, 2008

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You should send the set to the factory service rep, and not an independent TV service. They will need to have the boards to test the set. The independent service tech would have to buy the boards to test, and he would not have the factory setup to properly diagnose the set.

Your set is definately serviceable if the service tech is properly trained for your model type, and has the proper tools and spare parts to troubleshoot the set.

This fault can be in the main screen video processor board, or the address processor area, or the backplane processing area. Depending on the model, there can be a number of boards to cover these areas.

Once the defective board is determined, it can be swapped for a new one, and the factory level setups as required just have to be performed. The set should then be working properly.

Be prepaired that this type of service may be expensive. Some of these boards can cost a number of hundreds of dollars. They are not supported to be serviced at the component level.


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