Panasonic TX-55AXW634 backlight “fix” lifespan data (WHL #84F1)

Someone’s busy, so here’s a lame, lazy follow-up post to the Panasonic backlight “fix” from WHL #84:

It died. Again. Another string of LED backlight bit the dust just four months after the first one. Guess they’re all the same type, age and power-on hours at the same load, so why wouldn’t they fail left, right and center once the first LED has reached its lifespan?

Well, I had fun disabling another string on the Rohm BD9479FV backlight driver. Exactly the same procedure as shown before, and conveniently, someone already routed AGND for the PWM pin to connect to . Since both failed strings aren’t next to each other, there’s now two dark(er) bands instead of one really dark one straight across the device. Edges are still terrible, regardless of missing LEDs. And the image, once there’s no static content on the screen, is still decent – weird, but if you didn’t know, it’d be hard to figure out what’s wrong with it.
I told the fella last time to get a new telly right away, and he didn’t (four months, including Christmas season!) – maybe he will now…or he’ll ask again. There’s five strings left and that’s plenty, innit?


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