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LG 47LN578V-ZE backlight trips out

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jordan:
We need to open the panel and see which diode is burned

Simisker:
Just stripped the panel and only 3 of the 6 led strips work, 2 3 4 but 1 5 6 dont? Is there away a can test the led strips with my multimeter?

Turnip:
Hi Sim,
Usually if a strip doesn't light it's a burned Led joint or an O/C strip connector. Just pop off the lenses and have a look, as strips are usually connected series/parallel, one O/C led knocks out the entire string.

Can power up individual strings with a current limited P/S (or a resistance on series to hold down the max current to a few m/a) set at about 3v per Led (Sorts the duff one)

Best of luck - Chris.

Simisker:
Ive narrowed it down to the bottom strip, if I bypass it all the other leds work, there is 2 dead leds, led 5 and 8 and I think 8 is the culprit for the tripping, all I need to do now is figure out the easiest way to change the smd leds since I dont have any other strips spare

Davy:
Try Chas Hyde & Son   http://www.chsinteractive.co.uk/ or TV parts  http://www.lcdparts.net/xb.aspx.
You don't want to go by-passing them for obvious reasons.... just like by-passing crimbo tree lamps better to lob a couple of volts across each one.

Did I mentioned crimbo tree lights?
I think I was about 6 when I tried that trick, I lobbed silver chocolate foil in as I took them out... guess what, they got brighter and brighter - that's when I got my first 240V tingle.... wasn't shocking but just a tingle. Luckily my sister put them all back before dad got home.

Dave

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