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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We had a similiar issue with our SAMSUNG Plasma TV. It had a 2'or 3" vertical bar of random colors on the right side of the screen. It would also go away but then come back. Fortunately for us the TV was still under its original 1yr manufacturers warranty. We called the customer support and they scheduled a service call. The TV repair man took our TV to the shop and replaced the defective components. It took about 3 weeks for the repair.
there is a good chance that I can solve your problem, although for me and others this problem usually shows itself as black bars that go from top to bottom, not just half way. go to the following link and read the entire thread, it is very good info. I have done this and it worked perfectly on a gateway plasma, but it also works on numerous others. there is a guy on ebay that sells a fix for $80, and it appears to be exactly what i did.
http://www.avforums.com/forums/plasma-televisions/462873-black-line-fault-hyundai-hpt4240-fixed.html enjoy! stephen
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.
take your set to a tech you are having problem in your vertical output circuit.leaky filter or coupling capacitor,or defective B+ regulator transistor or IC .buffer transistor or IC,or supply resistor, they need to be replace.good luck