Have LG 50LN5400. Has audio and using flashlight, screen shows images
I replaced 1 strip of leds for backlight, all 3 boards but when powered on, backlight flashes once and goes out. I upgraded the tv software to prevent this after installing the new leds.
what am I missing?
Unfortunately, I have already replaced all 3 boards(psu, main and TCON). Only board not replaced is the one connected to leds. Unable to source that one.Unfortunately, I have already replaced all 3 boards(psu, main and TCON). Only board not replaced is the one connected to leds. Unable to source that one.
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Make sure the power supply is being triggered. If there is no LED_On signal it may read that. But if you know the backlight should be in, then check LEDs. Try powering each LED on the strip individually with a battery/resistor. unhook each strip before testing.
Chances are if it briefly comes on the backlights I mean the power board is shutting off because of over voltage or over current and some lamps are bad...On this set of yours if you try to test the strips you need to take into consideration these are 6 volt lamps not 3 volt that are used on most sets.
This is a common problem for LG 42LN5xxx & 47LN5xxx LED TVs, the problem is defective LED back lights strips, it has nothing to do with main power supply & the main board.
It is a very common problem for LG LED TV, the problem is defective back lights LED strip. You need to open the display panel, find the burn out strips & replace it (them).
? 4:44
https://www.youtube.com/watch?v=eEJoPCa7Kt0
Jan 24, 2015 - Uploaded by swappart.com
... explaining easy way to test individual LEDs on a strip from aTV backlight. ... Sharp LC-60LE820UN TV - LED Strip Testing - Long Version ...
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