Samsung TV with audio but no picture and no LED backlights. Flashlight test reveals screen image present. No signs of internal damage or disconnected wires. Suggestions?

Chances are your LED backlights are bad and it's shutting down the inverter, without the proper test gear there isn't a way to test the strips without removing the panel to get at each strip but in 9 out of 10 sets we repair with the symptoms you're describing it turns out being bad lamps not the power board

Renew the television

Well the cost to repair will be about $500 for parts.

The led driver is on the main board.

Use a voltmeter to confirm all the voltages are present when the TV is powered on. If they are all correct then replace the led driver.

Do flashlight test - if you can see image you need t con board. If no images seen, inverter board. TV Parts Universal TV Stands DLP Chips ShopJimmy

If you have done the flashlight test and an image is present on the screen when the light is shined from behind then the backlight or the backlight regulator is defective, both should be replaced.

If you saw no faint picture with the flashlight, then it's the T-con board.

sir,
even if you changed the back light inverter the fault remain as same, it seems to be the back light LED is damaged carefully remove the outer frame of the panel then dis connect the LCD then remove the frame of the defuser screen , take out plug your TV, check the LEDs

Here is what to check when your TV is turned on, power light is ON, but no picture is seen or sound is heard:

1 - Be sure the component you are using (Xbox, Cable, SAT, ROKU) is turned ON.
2 - Check to be sure all cable and cords are securely connected to the TV inputs and component outputs.
3 - Make sure you are on the correct input as some TV's will show a black screen if there is nothing connected to that input.
4 - Unplug the input you are trying to use from the TV (such as an HDMI Cable) and plug it back in.
5 - Check for signs of damage on all cords and cables from the TV to all components.
6 - Make sure the TV is not in ENERGY SAVE MODE, press the button on the remote control to go back to normal mode.
7 - Unplug the TV for 10 minutes to see if there was a temporary one time issue with the TV.
8 - Disconnect the TV from power for 2 minutes, then when plugging it back in PRESS AND HOLD THE POWER BUTTON ON THE TV FOR 10 to 20 SECONDS to try and force the TV to reset.
9 - If after checking all these different issues, you may have a Faulty Power Supply Board, A Bad Capacitor on the Power Supply Board, Loose Wire Harness, or Loose Ribbon Connector in the TV itself.
10 - Most likely when a TV has the power light ON but NO PICTURE and NO SOUND, it is the Power Supply Board that has failed.

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