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To answer your question;
Try to hold the "action" and "power" buttons at the same time for more than 10 secs.
Another one is:If you can get into the menu under "game guard" there might be a lock code , try 333
This works on panasonic tv of the same model, but then quasar is panasonic.
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If the screen is dark, then the brightness and contrast adjustment must be poor. Use the MENU key (in the TV or the Remote, either) adjust the brightness and contrast as per your viewing convenience. Service manual for this model is not in my knowledge and you should not try to repair or troubleshoot it by yourself without proper knowledge of the circuit workings inside.
im sorry but to let you know diamond vision tv is a private tv company that why they are not listed in any universal remote codes because they work for them self and they think that people will stop buying there remotes and so they decide not to programe any codes for other remotes
im a tv expert and we have always these problemes, what you should do is contact your cable or sat provider and tell them your problem and ask if they can reset you acount or code im sure they can help or bring a tv technician and they could fin dout the probleme CONTACT ME AT -email@example.com and il see if i can give you more information