Hi all.
My LG 47LN575V decided to die last night. Suddenly went black but sound carried on. Trying to turn off/on see a brief flash of the 'LG' logo bootup screen then back to black screen.
TV is ~3 years old.
The 'flashlight' test reveals the picture IS still there, so it's definitely related to the backlight, and my research indicates these are very prone to this being caused by LED failure.
Now, I've read up and found a few videos about checking these LEDS - either by testing the whole strip with a 24V source or by checking LEDs individually with a 3V or just under source... I'm pretty confident that I can diagnose any busted LEDS, but replacement strips seem a bit hard to come by and really rather expensive (I'm in the UK).
how feasible/sensible is it to simply swap out the damaged LEDS, and if I do what rating LED should I replace them with? if I couldn't get hold of an appropriate LED, could I get away with just soldering a resistor or something in place (and accept the not-too-great backlight civerage of course) - I've seen people saying they've successfully just soldered some wire in place to fix this where the LED has failed open, but of course that's going to hasten the demise of the remaining ones so I'd rather not do that approach.
My level of skill? I've successfully brought various things back to life by replacing failed caps (a PC motherboard, an old LCD TV, a sky+ PVR box) so I can use a soldering iron - although I'd be the first to admit I'm no professional. I have a very very basic knowledge of electronics and own a meter so I can check continuity and voltages etc., but I can't design circuits or necessarily diagnose them beyond playing "spot the burnt bit or bulging cap".
so... can I replace the LEDS myself, should I? and what should I replace them with?
Thanks
My LG 47LN575V decided to die last night. Suddenly went black but sound carried on. Trying to turn off/on see a brief flash of the 'LG' logo bootup screen then back to black screen.
TV is ~3 years old.
The 'flashlight' test reveals the picture IS still there, so it's definitely related to the backlight, and my research indicates these are very prone to this being caused by LED failure.
Now, I've read up and found a few videos about checking these LEDS - either by testing the whole strip with a 24V source or by checking LEDs individually with a 3V or just under source... I'm pretty confident that I can diagnose any busted LEDS, but replacement strips seem a bit hard to come by and really rather expensive (I'm in the UK).
how feasible/sensible is it to simply swap out the damaged LEDS, and if I do what rating LED should I replace them with? if I couldn't get hold of an appropriate LED, could I get away with just soldering a resistor or something in place (and accept the not-too-great backlight civerage of course) - I've seen people saying they've successfully just soldered some wire in place to fix this where the LED has failed open, but of course that's going to hasten the demise of the remaining ones so I'd rather not do that approach.
My level of skill? I've successfully brought various things back to life by replacing failed caps (a PC motherboard, an old LCD TV, a sky+ PVR box) so I can use a soldering iron - although I'd be the first to admit I'm no professional. I have a very very basic knowledge of electronics and own a meter so I can check continuity and voltages etc., but I can't design circuits or necessarily diagnose them beyond playing "spot the burnt bit or bulging cap".
so... can I replace the LEDS myself, should I? and what should I replace them with?
Thanks
Comment