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First, You should to replace by original part, then you should check the voltages on power supply, and check the voltage for vertical IC based on datasheet, also check the voltages on vertical section including yoke and last you should check the ESR capacitors on vertical section.
There are mainly two reasons for this fault. The first one is with its screen voltage settings. If the screen voltage settings have gone down [it can be happen automatically in rare cases], the screen will look dark. The second one is with its video output section itself. Anyway, you have to seek an experienced service technicians' help in this matter, if you are not handy in electronics.
Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.
patrioticdog-I have just answered a similar problem, you can remove the back and find the flyback transformer. The big part with the round rubber plug hooked to the pix tube. there will be two controls on the flyback one for focus one for screen. turn up the screen ever so slightly,your screen will brighten up.Also if you check the main pcboard ass'y there may be a sub bright control same thing small adjustments. maybe tell the guy to give a bit off cause of repair ,good luck let me know. cooltek Feb15/08