I have a Sharp 4T-B60CJ1U. It has no sound or display. I can see an image if I hold a flashlight to the screen. What do I do from here?

This is a backlight issue, it is either the led backlights or the T-con board, further testing with a circuit tester is required to determine which.

Information for advanced users.
The absence of an image in the presence of a signal is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix), for example, a malfunction of the LEDs( LED), and outside in their power source - the LED driver.
Without the backlight, you can sometimes see a barely noticeable image with a certain successful hit of external lighting on the screen.

Hello... It sounds like you have a backlight failure, and the image going away during the flashlight test is due to the TV going into "Protection" mode. A service technician may be able to go into the service menu and clear the lamp error codes and get the TV working, or it may need the backlights replaced. I hope this helps...

You would need to replace the backlight and its control board, about $600.00

needs a inverter board,backlight or display hold flashlight to screen in dark room at night to see if u can see an image if so display is good replace inverter board or backlight

Sounds like a backlight either power to the backlight or the backlight itself. It's probably going to require a trip to a repair shop.

It may be the internal backlight that is failing. When the display has failed but still has power, take a flashlight and hold it close to the screen, move the flashlight all around the screen and check if you can see anything. The display will be dark, but you should be able to make out the image that is there with the flashlight technique. If you can see an image on-screen, then your backlight has failed and you will need to replace the monitor. Weather or not you see an image is not a critical issue, but a tool to verify if the backlight is off or some other issue is causing the problem.
Note, it may be difficult to detect an image on the un-light display, for example if you have a dark image as your desktop background. So make sure to fully scan your display (top to bottom, and left to right covering the entire screen) with the flashlight technique in order to see any image on-screen.

It may be the internal backlight that is failing. You can take a flashlight and hold it close to the screen, move the flashlight all around the screen and check if you can see anything. The display will be dark, but you should be able to make out the image that is there with the flashlight technique. If you can see an image on-screen, then your backlight has failed and you will need to replace the monitor. Weather or not you see an image is not a critical issue, but a tool to verify if the backlight is off or some other issue is causing the problem.
Note, it may be difficult to detect an image on the un-light display, for example if you have a dark image as your desktop background. So make sure to fully scan your display (top to bottom, and left to right covering the entire screen) with the flashlight technique in order to see any image on-screen.

Is this through the tuner or input? If its through input check or switch out cables first. When you have sound if you can shine a flashlight into the screen and see movement or video, your backlight is out, which can be a invertor board or bad capacitors on the power supply board. Invertors have to be replaced, some power supplies can be repaired. A repair shop will be able to tell which it is.

If you have sound on the stations this is a problem in the display. Take bright flashlight and hold it against the screen. Look for an image around the edge of the flashlight. If you see an image then it's one of three problems;
1) The inverter board is bad.
2) The CCFT (cold cathode fluoresent light) are bad.
3) The power supply to the inverter board is bad.
Someone knowledgeable in electronics can replace the bad part(s).