LG 32LN578V PS b/d issue

[notallbad]

Re: LG 32LN578V PS b/d issue

yes ordering from china is taking roughly 6 weeks i notice lately not sure if rs etc sells leds? as you know the colour size voltage and amps needed so maybe worth a look

all i know is that the 3v 1W 3528's keep blowing so shall go for the 6v 2W 3535's.

trial and error here!

shall update with my findings, in about 6 weeks time, what a drag having to put it all back together again only to be having to disassemble again. hopefully I wont break the panel on the 3rd attempt.

[diif]

Re: LG 32LN578V PS b/d issue

all i know is that the 3v 1W 3528's keep blowing so shall go for the 6v 2W 3535's.

trial and error here!

shall update with my findings, in about 6 weeks time, what a drag having to put it all back together again only to be having to disassemble again. hopefully I wont break the panel on the 3rd attempt.

Have you got a photo of the back of the LED ? I have quite a few here and could post you a couple if that helps.

[notallbad]

Re: LG 32LN578V PS b/d issue

Have you got a photo of the back of the LED ? I have quite a few here and could post you a couple if that helps.

that would be great if they are the same, 2 pad type

[budm]

Re: LG 32LN578V PS b/d issue

Per LCD panel spec it shows Vf of the LED string as 111.6V min, 118.8 typ. 127.8 max.
You have 21 LEDs (per post #13) so 21 LEDs x 6V LED = 126V.

[vinceroger69]

Re: LG 32LN578V PS b/d issue

Per LCD panel spec it shows Vf of the LED string as 111.6V min, 118.8 typ. 127.8 max.
You have 21 LEDs (per post #13) so 21 LEDs x 6V LED = 126V.

Thanks for confirming that budm i wasnt sure when i made that post budm in the post the ali express link i posted was they the correct leds? im always confused on what mah reading we should be looking for as some are forward some are reverse etc.

[vinceroger69]

Re: LG 32LN578V PS b/d issue

that would be great if they are the same, 2 pad type

is anode the large or small pad? i have some here too but need to check what voltage and pad layout they are

[diif]

Re: LG 32LN578V PS b/d issue

I have some of these. https://www.aliexpress.com/item/110P...812353527.html

[vinceroger69]

Re: LG 32LN578V PS b/d issue

I have some of these. https://www.aliexpress.com/item/110P...812353527.html

i have the same ones you have linked these are the 3 volt version 1 watt
these are the ones i think he may need but these are 2 watt not sure about the current rating etc
https://www.aliexpress.com/item/50pc...StoreLevelAB=3
please read the comments as one person has said anode and cathode is wrong the picture is not correct so dont take my word they are the correct ones

[budm]

Re: LG 32LN578V PS b/d issue

Tension maximale:6.0-6.8V (250mA)Type
LedCourant maximum:500mA

250mA should be the max, but LG probably drives them higher than that.
That is a lot of power dissipation for one small body LED to handle and uses the same heatsink (the strip) as the single LED (3V).
So make sure to run down the backlights as low as you can.
They use 6V LED instead of 3V LEDs so they save money on the qty. of the LENSES

[notallbad]

Re: LG 32LN578V PS b/d issue

is anode the large or small pad? i have some here too but need to check what voltage and pad layout they are

anode is small pad

[vinceroger69]

Re: LG 32LN578V PS b/d issue

anode is small pad

see post 28 one person says the picture is wrong so maybe the anode is the small pad?

[diif]

Re: LG 32LN578V PS b/d issue

Actual LED I have, the link I posted was one that looks similar (may or may not be the ones I have 10 of).
Negative is the big pad.

[vinceroger69]

Re: LG 32LN578V PS b/d issue

Actual LED I have, the link I posted was one that looks similar (may or may not be the ones I have 10 of).
Negative is the big pad.

diff are yours the 3v version or 6v ones?

[budm]

Re: LG 32LN578V PS b/d issue

LED for LG panel has BIG pad as Anode, those are what use so far. You should 100% verify for sure.

[notallbad]

Re: LG 32LN578V PS b/d issue

LED for LG panel has BIG pad as Anode, those are what use so far. You should 100% verify for sure.

You are correct!

On the LED Strip the larger solder pad is on the anode side, smaller solder pad is the cathode.

Clearly the 3v led's (the wrong ones for this panel) I have are the other way around. And as pointed out, the photo I posted of the underside pad of the led is of the 3v replacements, not the led removed from the panel.

[diif]

Re: LG 32LN578V PS b/d issue

diff are yours the 3v version or 6v ones?

6v. Tested with my LED tester it showed 5.5v.

Photo I missed from my other post. Taken through a microscope to show the detail.

[vinceroger69]

Re: LG 32LN578V PS b/d issue

sorry wrong thread

[notallbad]

Re: LG 32LN578V PS b/d issue

6v. Tested with my LED tester it showed 5.5v.

Photo I missed from my other post. Taken through a microscope to show the detail.

How many could you let me have?

I have ordered some (qty. 50) but 6 weeks is a looooong time! Especially after waiting 6 weeks for the wrong ones 3v, though thats an error on my part.

I need to change 2 leds, 1 on upper strip and 1 on lower strip and not being the greatest at soldering could really do with a couple extra just in case.

I understand if you only have a few and can't spare any out.

Of course I shall send payment or post some back when they arrive if preferred.

Meanwhile I have some 3v leds (qty. 95 remaining) if anyone needs a few in a hurry, just pm me.

[diif]

Re: LG 32LN578V PS b/d issue

I have 10, how many would you like ?
I can't see you waiting 6 weeks, stuff is taking about 2 weeks currently. I have one delivery last week that took 7 days.

[notallbad]

Re: LG 32LN578V PS b/d issue

I have 10, how many would you like ?
I can't see you waiting 6 weeks, stuff is taking about 2 weeks currently. I have one delivery last week that took 7 days.

Pm'ed you. Thanks