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If you set the lamp mode to LOW POWER, each time you turn ON the TV the lamp will start out at HIGH BRIGHT mode, but will switch to Low Power mode after a short period of time. You may notice a change in screen brightness when this happens. This is not a malfunction.
Just check whether you have selected this mode. Go to its user manual [P57]. All details are there about the lamp brightness settings. If it is not set to Low Power and still you get a dim picture, the lamp may be weak and has to be repaced. OK.
It is normal for your TV to take a few moments to reach a brightness level that you can enjoy. A typical Mercury vapor lamp will take amout 2 minutes before it reaches it's optimal brightness. It will continue to increase slightly about 10 minutes longer, but you will not see those subtle changes. So, your TV is functioning as it should, just enjoy the show. If you want to learn a little more about the Mercury Vapor lamp it your TV, please check out my Tips & Tricks. I hope this was of some assistance.
you "tooled around with the convergence board"
well this chassis has several problems
if the convergence doesnt hold replace both stks
resolder around that area per tosh tech bulletin
the bright problem is probably the hyper module
all toshs should be checked with toshiba website to see if they were part of the recalls for power supply caps