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LG 47ln578v
Southerner1959:
I have the same Backlight fault on an LG set . . .
The power to the LED strips from the PSU Board is only on for the short time the screen is on.
What I don't understand is HOW the screen can work perfectly for about half a second on switch on, and again at switch off, if the LED strip is faulty?
Having said that, what would be the normal resistance measured using an Analogue ohm-meter of the LED strip?
(It looks a really difficult job to take the screen apart, so I'm trying to make sure this is the problem)
kennyc:
Hi guys ,have had same problem with the 40 inch Toshibas . Never managed to get to the bottom of any of them . Strips are glued on . To be honest dont think they are designed to be fixed . They want customer to throw TV away and buy new one just like a kettle every couple of years . We all better start looking for other jobs
zomikula:
Use a heat gun at around 200 to heat up the strips loosens the tape and they come off
Same to reapply
heat up the adhesive and when applying heat and push down.
If replacing single led this can be done insitu without removing the strip
Turnip:
Hi Folks,
Just had one in where 2 Leds were S/C and one O/C. Replaced them and powered up with a bench supply finding all strings lit OK.
Reassembled without breaking the screen - Powered up, and after a brief screen flash it cut to S/by.
Powered up again - Straight to S/by. Checked Leds for a possible chassis leak - Nope. Disconnected feed to Leds - Cuts to S/by.
Bit puzzled - Any thoughts ? - Chris.
tv tony:
Have this range of sets on the bench all day Chris. LED failure doesn't invoke stand/by.
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