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Why tv is on, volume works and can see a picture if you shine light on

Why tv is on, volume works and can see a picture if you shine light on

TV powers on with volume, but no picture. If you shine a flashlight on the screen you can see the picture. Worked fine the night before??

Asked by: Guest | Views: 229
Total answers/comments: 5
bert [Entry]

"@kathy1964 I recognize this is an old question but it does not appear to have any valid answers. Since “If you shine a flashlight on the screen you can see the picture. “ you already determined that this is a backlight issue. Your TV does not have a separate backlight inverter etc. Resetting it, or turning ift off and on will not fix the backlight.

You will have to measure the output of the power board to see LED backlight array. You can measure that directly on the connector at the power board. Samsung TV’s have the values expected, printed on the circuit board. Measure those and make sure that they are all in compliance. If you have less power as expected or none going to the backlight array, you have a power board issue. IF you do not get teh BL_on signal from the main board then that is the issue.

To test the actual backlight array, all you have to do is to remove the back of the TV and disconnect the cable from the power board to the main board. Then turn your TV on. If you do not get teh backlight turned on, it is the backlight array that has failed."
bert [Entry]

I have tosheba hd tv have had it for about 1 year and half today the picture went out but sound stayed on. Left it like that bout 5 minutes turned off. Shut it back on the picture came on.
bert [Entry]

Hi everyone I've had same problem with my tv with it going black but still has sound and when you shine light on it you can see picture. I went on to my picture settings changed it to standard, then went to the backlight setting and put it at its lowest and it seems to work. Yes screen is abit darker than usual but maybe can mess around with brightness ect to make it better. Hope this helps
bert [Entry]

Right away it sounds like a bad cap. You'll probably have to replace the power board or have it refurbished. It's common for those to have power/led combo boards and for 1 or 2 of the smaller caps on the led side to pop and leave the power side unaffected. It is also possible that it has a separate led driver and backlight inverter. In which case I'd look at those but it's been my experience that the ones with the led backlight boards separate from the power supply end up needing new led strips. This definitely sounds like a hardware issue and the back will have to be removed for troubleshooting.
bert [Entry]

My TV is plugged up I have volume no picture screen is black shine flashlight on it I see picture