LG powerboard, want to just bring on leds

[Fleckers tv]

Hi just want to light the leds from its powerboard only, which pins to I bridge please, all pics should be above,

Thanks chums

[Hamie]

Re: LG powerboard, want to just bring on leds

Drv on to 3.5v

[Fleckers tv]

Re: LG powerboard, want to just bring on leds

Cheers Chum

[Fleckers tv]

Re: LG powerboard, want to just bring on leds

mmmm, not come on ? am I missing something

[dick_barton]

Re: LG powerboard, want to just bring on leds

What voltage do you have as standby voltage?

[Hamie]

Re: LG powerboard, want to just bring on leds

I take it you've already bridged 3.5 to pwr-on?

[Fleckers tv]

Re: LG powerboard, want to just bring on leds

Yes it's bridged , it's from a damaged screen, strangely I'm reading the input volts as 270, can't be right, but I have double checked , will check all voltages in a mo

[ReeceyBurger123]

Re: LG powerboard, want to just bring on leds

Wait so the Led voltage is 270v ?

[CapLeaker]

Re: LG powerboard, want to just bring on leds

Yes it's bridged , it's from a damaged screen, strangely I'm reading the input volts as 270, can't be right, but I have double checked , will check all voltages in a mo

How much volts you have on the main filter cap? As long as the PFC booster isn't working, there will be no lights either.

Check the PSon pin from the PSU against GND.

[stj]

Re: LG powerboard, want to just bring on leds

pfc is not so important in europe, we start with a decent voltage.
that said, he should have over 300v on the main cap even without pfc.

[ReeceyBurger123]

Re: LG powerboard, want to just bring on leds

Was about to say I have had Vestel supplies fire on a 42" Cfl backlight and some Led ones fire on the Bl with faulty Pfc and the bulk cap voltage being 330v dc. On 240v ac rectified its plenty with out a Pfc booster to work the set but the output might become a little unstable.

[ReeceyBurger123]

Re: LG powerboard, want to just bring on leds

Lg's are weird, you need to find a way of getting 1.2v to the dimming pin to get the Led driver to come on.