LG 42LB585V - Backlight issue.

[Turnip]

Hi folks,

Got one in with a quick flash of 'LG' but sound continuing. Leds fed by two wires so all in series.

Test measurements were a bit odd. Voltage initially 250v dropping to 105v but noticed on the meter there was a reverse resistance I hadn't noticed with earlier LG Led sets.

Took the screen apart finding 4 strings of 8 Leds that required 40v to light up per string. About to replace O/C Led from stock but noticed the new Leds were a little bigger and needed 5.5v to fire up.

To Ebay where China supplies 6v LG Leds at £5 for 50 - Wish I'd got some as UK ones are a pound a pop at the moment.  Nice side is that Leds can be replaced by snipping off the old one, cleaning up the PCB strip and fitting the new one with LMP solder. Taking out the plastic reflector sheet would be a real fag as there are dozens of securing plastic devices that don't seem to come off so easily - Chris.