LED TV has sound but no picture?

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

Shine a light on screen with TV playing and if you can see some video you have either a bad LED driver circuit on Power Supply or a bad LED strip in the backlight. If bad LED Backlight it's a very complicated and time consuming repair. FYI the Model# is probably XBR75X940D.

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

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.

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

hi the driver board and power board may be built on to one, but i think you have a shorted led in the panel,

thanks

shaun

Depends on the make and model of the unit. You did not say what it is. Some have bad LED backlight strips and others have bad inverters or PSU's.

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usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs

Sounds like a bad inverter thats what powers up the backlights so you can see the picture on the screen. usually its about 85% of the times the inverter if you have pefect audio and remote functions but a black screen in a LCD modeel TV. You can get the inverter board from www.tvrepairworld.com