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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the TV.
Appreciate the additional information.
For a Sanyo DP46849 model and if all external factors have been checked and ruled out, then the described symptom would almost always indicate an internal hardware issue.
The above would require that the unit be opened up for visual inspection, voltage/continuity/resistance checks, confirm faults and effect repairs.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even perhaps a soldering iron?
My participation is strictly limited to technical, repair and/or installation issues.
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