Chosen Solution
Hi there, i have a Samsung UN40EH5050F led backlight Issue. I can see the picture with the flash light. The backlight will work for 1 minute when I hard reset the TV. I checked the power supply and all components look normal, nothing burn or melted . I used the voltage meter and checked the 4 pins that supply the power to the led. They provided 206 voltages when led light on. 0 voltages when backlight shut off by itself after 1 minute. Anyone knows what’s cause this issue and components need to replace? Please see pictures below. Thank you in advance. power supply:
red and black circle are the 4 pins where I tested for power to led backlight.
@khongcan disconnect the cable from the power board to the main board and turn your TV on. See if the backlight comes on and stays on. If it does not stay one and the voltage drops to 0V and the backlight turns off it is entirely possible that this is a power board issue. Now if it turns black first and then the voltage goes to 0 after it is most likely a bad backlight LED strip
