Can I use a 47-inch LED HDTV as a monitor for photo editing?

Yes, you can use an HDTV as a PC display for photo editing, but there are trade-offs. The main issue is not your photo file size, but the TV’s actual display resolution and image quality. A typical HD TV only shows about 1920×1080 pixels, so your 4900×3600 image will be scaled to fit the screen. You won’t see the full image at 1:1, just as with many regular monitors.

For editing, the bigger concerns are color accuracy, calibration, sharpness, and viewing distance. TVs often apply extra processing, sharpening, contrast, and overscan that can make images look less natural than on a good computer monitor. If you use a TV, look for a PC or game mode, disable image enhancements, and calibrate it if possible.

A large screen can be comfortable for viewing and layout, but many photographers prefer a monitor designed for computer use because it usually offers better color consistency and pixel density. So: usable, yes; ideal for critical post-processing, not usually.