So i ran tests on the power supply and all of the voltages going to the main board are fine. I tested all of the capacitors on the psu with an esr reader and they all pass. All diodes pass also. But when a reading is done on the 4 pin white led connector on the top of the board, the voltages will flicker to 5Vdc for a fraction of a second and go out again. For that fraction, the LED backlights light up. Anyone have any clues to this situation?
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LG 50LF5800-UA Backlights flicker on and off
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Re: LG 50LF5800-UA Backlights flicker on and off
Quick flash of backlights or flashing backlights are both symptoms of bad backlights. Especially on LN, LB or LF series.
https://techhometravel.com/lg-ln-ser...ed-backlights/
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Re: LG 50LF5800-UA Backlights flicker on and off
If your leds flicker then you must have a high voltage at the connector in order to light them up. The voltage may sharply spike at switch on and then drop quite rapidly.
Recheck the voltages at each pin to chassis at switch on and repeat for all four pins.
Quite can't see what is given on the circuit board but it looks like one set of leds run at 113V and the second set at 170VWilling to help but I'm no expert.
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Re: LG 50LF5800-UA Backlights flicker on and off
Originally posted by neilc6 View PostQuick flash of backlights or flashing backlights are both symptoms of bad backlights. Especially on LN, LB or LF series.
https://techhometravel.com/lg-ln-ser...ed-backlights/
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Re: LG 50LF5800-UA Backlights flicker on and off
There, notice the two for 32 dollars are from the U.S., look at compatible models in their description: https://www.ebay.com/sch/i.html?_fro...acat=0&_sop=15
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Re: LG 50LF5800-UA Backlights flicker on and off
Would this be the right one for 50LF5800: https://www.aliexpress.com/item/4000...63504c50BkNUaT
Nine LEDs per row with five rows?
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Re: LG 50LF5800-UA Backlights flicker on and off
Ok so these LEDs worked fine but i ended up breaking about half of the clips off that keeps the white panel from touching the leds. Anyone know what these are called so i can order new ones? I can see the round shape of the led covers on the screen when watching tv.Last edited by Jackching; 03-10-2021, 02:29 PM.
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Re: LG 50LF5800-UA Backlights flicker on and off
Whatever is in the picture there. They're called standoffs are they? Go to 7:40 in this video: https://www.youtube.com/watch?v=s4wNc3hF4JILast edited by Jackching; 03-10-2021, 03:02 PM.
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Re: LG 50LF5800-UA Backlights flicker on and off
So anyway i put all the broken standoffs back on with glue but can still see two leds shining through the screen when it's on. It's like they are brighter then the rest or something. They are especially visible when there is a lot of white on the screen in those areas. I cant figure it out. I got them from aliexpress. Maybe they're faulty. Is it possible to put the light filters back in upside down?Last edited by Jackching; 03-12-2021, 02:58 PM.
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