Why does backlight only turn on?

I have a LG 60pz950 Plasma 5 years old was working fine then one day turned on the tv and you see the tv is on but no picture and also if you select tv source etc nothing shows on the tv screen you would usually see the tv menu. I ended up buying a new TV. I found used boards and replaced them which didn't fix them. I also tested all fuses that work. How do I diagnose this issue next? I appreciate all the help.

Ответ на этот вопрос У меня та же проблема

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Here is the previous link with photos. Tv turns on back light only

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The mainboard replacement corrected the issue. There is a thin material that I guess prevents the heat which sits over the chip then a huge heatsink. I am not sure what more that is so thin I can put to prevent this from dying on me this time around.

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