LCD Screen Stays Black

Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

When the display shows the following cases, that need to be replaced a LCD Inverter:
No image on the screen, but the power light stays on
Dark display but still readable
Between the screen flashes on and off 1/2 to several seconds
Power light stays on, but no display and sound
No image on the screen, but LCD TV still has sound
Picture cycle on and off, as well as high-power LED lights

When the following situations, you need to replace the LCD inverter:
No image on the screen, but the power light stays on
Dark display but still readable
Between the screen flashes on and off 1/2 to several seconds
Power light stays on, but no display and sound
No image on the screen, but LCD TV still has sound
Picture cycle on and off, as well as high-power LED lights
More:http://www.lcdinverter.info/acer-travelmate-8001-lcd-inverter-p-2046.html

When the following symptoms, the need for LCD inverter with a: No image on the screen, but the power light stays on
Dark display but still readable
Between the screen flashes on and off 1/2 to several seconds
Power light stays on, but no display and sound
No image on the screen, but LCD TV still has sound
Picture cycle on and off, as well as high-power LED lights

It sounds that the main digital board to this TV is faulty. Contact any service technician.

Sounds like the back light has gone. Probably not worth fixing as it would probably be to expensive because of whats involved in the repair. It's only cheap Sanyo rubbish anyway.

I could not find an online manual, but most cameras have an option to shut off the LCD screen when taking pictures. Check this in your manual, there's a great chance this is the problem. If not, you have to seek professional help

When I turn my sanyo vpc-s1285 on it stays of the blue Sanyo Screen Can you help me fix this?

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Have u tried re-installing the video drivers?