@jellealgra you already have it solved:-) "I know a part of the LED strip is broken " this will most like prevent the rest of them to come on. This is a Philips not a Samsung. Everybody does it a bit difference. You cannot rule out a bad backlight until you have replaced that. "Not much you can do to these tvs today" is wrong. You can change each and every single board on these which you could have never done on a CRT. This is fixable, so repair what you know is already broken and then re-evaluate and let us know. Keep repairing, not replacing!
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@jellealgra you already have it solved:-) "I know a part of the LED strip is broken " this will most like prevent the rest of them to come on. This is a Philips not a Samsung. Everybody does it a bit difference. You cannot rule out a bad backlight until you have replaced that. You said you checked the boards. Did you have a chance to check all the fuses as well as the T-con board. Post some images of all of your boards with your question. That would allow us to see what you see. Use this guide https://www.ifixit.com/Guide/Adding+images+to+an+existing+question/21499 for that."Not much you can do to these tvs today" is wrong. You can change each and every single board on these which you could have never done on a CRT. This is fixable, so repair what you know is already broken and then re-evaluate and let us know. Keep repairing, not replacing!
@jellealgra you already have it solved:-) "I know a part of the LED strip is broken " this will most like prevent the rest of them to come on. This is a Philips not a Samsung. Everybody does it a bit difference. You cannot rule out a bad backlight until you have replaced that. "Not much you can do to these tvs today" is wrong. You can change each and every single board on these which you could have never done on a CRT. This is fixable, so repair what you know is already broken and then re-evaluate and let us know. Keep repairing, not replacing!