What is the LED TV backlight problem?

If your TV has sound but no picture and with a flashlight, you can see a very dim picture on the screen background. 90% it is likely your TV has LED backlight panel doesn't work.

There are many parts can cause the same symptom: "TV backlight problem". Please read below for details:(Click on photo to enlarge).

1- The connectors and wiring assy failed (it is open or shorted) to supply power to backlight panel (The backlight needs power to lit up, without this power, the backlight doesn't lit anymore). The average labor to fix this problem varies between $60 to $140 (depending on the connectors or wiring problem are inside or outside of back-light panel assy. 

         

2- The backlight power supply board doesn't work, no backlight power. Around 70% of the cases, the cost of power supply board  varies between $40 up to $180 (depending on the the brand name, TV size, model number, part number,  part stock availability, part shipping ...)
 
LED TV boards            LED TV signal control cables
3-  The controller board (main-com) controls the backlight operation. (Some TV models,  Tcon board involved in backlight controlling too). It controls the power current goes through the backlight panel. It makes TV's picture bright, dark, dim or even OFF completely depending on the scene. The operation is programmed in TV's memory and microprocessor of the main-com board, without this control commands, backlight power will be OFF all the time.  Around 70% of the cases,  the cost of controller board varies between $40 up to $180 (depending on the  brand name, TV size, model number, part number,  part stock availability, part shipping ...)
    
32 LED backlight panel         50 LED backlight panel   
  
84 LED backlight panel         LED backlight panel compact type
 
4- The back-light LED panel. There are more than 10'000 backlight model, different type completely (depending on TV brand name, size,  model, version..)   This LED panel acts like the lamp of your TV. It supplies the light sources for your TV to see the picture on the screen. It is controlled by power supply, main-com board...  Around 70% of the cases,  the cost of LED backlight set  varies between $50 up to $160 (depending on the  brand name, TV size, model number, part number,  part stock availability, part shipping and how many LED strips must be replaced ...)
 
These LED strips replacements are available on our parts website galaparts.com  Please search by model number, part number, and double-check to make sure all connectors are identical. It is recommended to replace the whole set, LED strips at once for the LED backlight panel will be last longer.