09-04-2017, 12:39 PM
Oddly, I'm dealing with something similar at the moment... comes on for 1 second or less, then goes dark... however, on looking closely in a decent light, you can see that the LCD is actually working...
We have panels of LG 55" monitors in 2x2 matrixes - one panel of one of the grids has failed - they are not made any more and replacing all 4 will cost USD 4,000... (can't replace one with a different make or model - it'd look wierd).
So, I swapped the PSU from the failed panel with a known good one from one of the others. No change. Likewise, swapped over the CPU board (there are only two boards in these things). No change.
The LCD itself seems to be working, but the backlight has failed.
On these screens, the backlights are strips of LEDs - I found a kit one eBay for about USD 25 - this is a very common fault generally with many makes and so bits are always available.
Moral: Don't assume it's the PSU board (though it may be) - the LEDs/CFL backlight could be the culprit...
We have panels of LG 55" monitors in 2x2 matrixes - one panel of one of the grids has failed - they are not made any more and replacing all 4 will cost USD 4,000... (can't replace one with a different make or model - it'd look wierd).
So, I swapped the PSU from the failed panel with a known good one from one of the others. No change. Likewise, swapped over the CPU board (there are only two boards in these things). No change.
The LCD itself seems to be working, but the backlight has failed.
On these screens, the backlights are strips of LEDs - I found a kit one eBay for about USD 25 - this is a very common fault generally with many makes and so bits are always available.
Moral: Don't assume it's the PSU board (though it may be) - the LEDs/CFL backlight could be the culprit...
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