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Hello, I'm Shahid and will be happy to assist you. I need additional info of TV symptoms to troubleshoot the problem.This is not an answer so do not rate it.
- Can you please get me the complete model number written on back of TV? it could be 42PD7800TA or some thing?
- When do you get "Demonstration Picture Master On/Off" display on screen?
Thanks for the info.
There is an option 'Mode Display' in Function Menu, have you tried to set it Off that might help?
Please reply back with the result.