Re: LG 42LN575V backlight issue.

Thanks guys for all your help.
While I am basing this on your initial diagnosis, I think I will write it off.
I don't have the patience to strip it down and test the LEDs, I really don't.
Nor do I have the money to purchase a power supply to test it and then £65+ for the strips.

We shall save and get a new one, if this has happened once before with this LG tv, it could again and I would rather cut and run.

I have learnt some good things doing this and I do appreciate the time you guys have taken...

Re: LG 42LN575V backlight issue.

Sorry,

The figures for those P801 pins are (from top to bottom based on picture I just uploaded).

All readings fluctuate between two values:

214/231
34/74
39/105
45/80

Another dumb question, I didn't realise there was a second set of pins to test.

How can I test them? I tried removed the cable connected in there, but I assume the cable must be connected for the TV to function to a level where I can test it (the power button for example).
...

Re: LG 42LN575V backlight issue.

Thanks guys, really appreciate the detailed responses and thank you for putting up with my total lack of knowledge.

I did what you said (as best as I could) and got the attached readings.
All readings are when the TV is on and not on standby....

Re: LG 42LN575V backlight issue.

Sorry for not replying sooner. Money has been so tight, it has taken me nearly a month to scrape the money together for a meter.

I ended up buying one. I will admit, the settings wheel looks daunting.
To get the results you are after, by measuring certain points, which "mode" do I have the thing in? Or does it not matter?

I am going to try get those readings today, I need to know what is wrong with this damn TV....

Re: LG 42LN575V backlight issue.

Thanks all for giving me some good advice here. I will work my way through it best I can.
I removed the back cover again and using my terrible meter (which is essentially a series of lights going from 4V to 400V) I tested the contacts (marked on the attached). I assume that while the TV is on it would give out power? Well it doesn't. Every 3/4 seconds my tester flashes for a split second but that is it.
I would assume then that this board is just not providing power to the led strips?

I am leaning towards buying a new...

Hi,

Hoping you guys can come to my rescue here.
Firstly, let me apologise if my knowledge is not as thorough as you may be used to on this forum. I really know nothing about repairing, but I am reaching out in the aim of saving money on a repair and saving my family who are going crazy without a TV (2 young boys).

My LG 42LN575V has developed an issue. About 7 months ago, the backlight seemed to have failed. I could see the image if I shone a torch onto the screen. I sent it to my local repair shop and I think they charged me just over £100 to fix the issue....

Re: New Members - please post your introductions here

Mellow greetings!
Hoping there are some wizards on here who will no doubt become a shoulder to cry on, since my luck with electrical items is rather, poor. Yikes.