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Do not replace whole convergence board.Because convergence data stored in old board cannot transfered to your new board.Means in your new board there is no convergence data.Unless you have the service manual and know how to get service menu.
I believe if you have convergence problem one of your IC (STK) is bad along with couple of small
take the front panel off behind the speaker grill and it will be a small button manybe blue or white and that is the button your looking for. it is at the front of the board and you can only press it when the tv is on to go into service mode.
JustinMan, if you use original IC`s (not the el-cheapo chinese copies) the odds are good you will need no or minor adjustments which don`t require the need to go into service mode which you really shouldn`t go into unless your experienced with tv repair, you should be able to order the serv. manual here, www.partstore.com it will give you the parts list and set-up procedure, good luck, BMW Rider
You should have purchaced the service manual before you went into the sevice mode, as the service mode is a dangerous place to be if you do not know anything about it. You can get the service manual from www.servicemanuals.net for about 20 bucks or so. A lot less expensive then a serviuce call I would think.
Sounds like it is going into shutdown mode. When the TV power supply and system control sense an overload the system control turns the TV off to prevent further damage from happening. I suspect it is a shorted convergence IC. It would be best to call a service center to repair the TV.