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T430 Backlight dimming = mad flickering

T430 and later, plus T530 and later series specific matters only
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T430 Backlight dimming = mad flickering

#1 Post by ketsa » Sat Dec 08, 2018 1:29 pm

Hello all,

I recently acquired a T430, it works well for my needs but I have one problem with it :

The screen only works correctly on maximum brightness,
One press on Fn-F8, it strongly dims and starts flickering like mad. unusable.
Further presses on Fn-F8 reduce brightness but still flicker very fast.

It is not an operating system issue as it also happens on the BIOS screen, on windows and on Linux.

Any ideas where it comes from ?


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Re: T430 Backlight dimming = mad flickering

#2 Post by Screamer » Mon Dec 10, 2018 5:47 am

I suspect that it has something to do with the display panel's backlight or the inverter, but have you tried to reduce the flickering via IntelPWMControl?

If the display panel doesn't show any signs of an aging backlight (strong pink/red tint on boot-up), it could be the inverter that is at fault. If I were you, I would replace the inverter and see how it goes from there.

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Re: T430 Backlight dimming = mad flickering

#3 Post by RealBlackStuff » Mon Dec 10, 2018 6:33 am

T430 does not have an inverter, which was only used with CCFL backlight.
T430 has LED-backlight, which is supported by the LED-board (see HMM pages 108/109).
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