Multiple symptoms: entire backlight off or partial gray area
TV: LG 55GA7900
My TV shows multiple symptoms.
When it shows problem, few seconds after turn on the TV, either 1/10 of screen shows shadow (LCD still shows image) that looks like partial backlight out or entire backlight goes off (Still I can see lcd is working when I put flashlight).
On the other hand, the TV works just fine sometimes for as long as it gets when it doesn’t show the problem.
I initially thought this could be a power supply board issue because all led bulbs seem to work just fine when the TV works fine.
So I was going to replace the power supply board but I also read an article saying that some TV shuts off when there is bad led bulbs in the back light.
I need help to isolate the problem whether the power supply board is wrong or there is a bad led and here are my questions.
- When the TV shuts down to protect it from bad led bulbs, is it just turn the back light off or turn entire TV off?
- Can defective led strip be working fine for hours, partially out, or out entirely and the symptom randomly repeats?
Thank you in advance for all of your answers.
Ist dies eine gute Frage?