That sounds like a Tcon board issue. You can get the Tcon board from www.tvrepairworld.com
SOURCE: picture is slightly too large for our sanyo DP42848
This is a problem with the aspect ratio setting. Usually found in the setup section. You can use your owners manual to locate the setup section and find the procedure for changing the aspect ratio settings.You should be able to do with the remote control or the buttons on the television. You can call the Sanyo customer support at this telephone number. 1-800-877-5032. Give them the model number of your television and they will be able to help you . I hope this information has helped you with your problem.
SOURCE: dp42848 when first turned on
The T-con board in your tv is the board that transforms the data coming from the image processor in a form that can be displayed by the LCD screen. In your case it is failing - a chip has started to detach from the board because it was badly soldered at the manufacturing stage. When the tv heats the solder points dilate and allow a partial contact. Since this cannot be fixed - you can't resolder the chip - the entire board will have to be replaced. This is going to cost you around $250, including the labor of the repairman.
SOURCE: 2 year old Sanyo DP42848
You may have a defective inverter. The inverter provides the back lighting you need to see video. There is good chance the starting resistors have changed values. It would be best to replace the inverter in your case. I would have to have a schematic to find the bad resistors. Thanks for asking and show a few hands of support.
SOURCE: I have a sanyo LCD
Liquid Crystal Display (LCD) screens have a light behind the display that shines through the screen so that you can see the picture. If you can see picture dimly on the half that is not backlit, it sounds like half of the backlight is not working. For this you will need tecnical assistance. H
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