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Search found 5 matches

by a_q
Mon Nov 25, 2019 3:38 am
Forum: ThinkPad T430/T530 and later Series
Topic: T430 Backlight dimming = mad flickering
Replies: 14
Views: 1515

Re: T430 Backlight dimming = mad flickering

Looks like the root cause was a loose cnnector behind the screen. This looks like poor design as there is nothing retaining it. Anyhow in the mean time the screen itself has developed a fault so I am looking at swapping it out. The one in there is a B140RW02 AUO (40-pin connector), does anyone know ...
by a_q
Mon Nov 11, 2019 3:40 am
Forum: ThinkPad T430/T530 and later Series
Topic: T430 Backlight dimming = mad flickering
Replies: 14
Views: 1515

Re: T430 Backlight dimming = mad flickering

Last time I looked, zero ohms is continuity. You weren't thinking "infinite ohms" were you?

:D
by a_q
Sun Nov 10, 2019 8:32 am
Forum: ThinkPad T430/T530 and later Series
Topic: T430 Backlight dimming = mad flickering
Replies: 14
Views: 1515

Re: T430 Backlight dimming = mad flickering

D'oh! These 0402 components are ridiculous (and I work with them professionally too.) F3 and F19 are both OK - read 0 ohms. Given that there's an F19 one question is where are F1, F2, F4-6, F8-F18? Anyhow the hunt is still on for the fault. Is the boost convertor for the backlight on the motherboard?
by a_q
Sun Nov 10, 2019 5:26 am
Forum: ThinkPad T430/T530 and later Series
Topic: T430 Backlight dimming = mad flickering
Replies: 14
Views: 1515

Re: T430 Backlight dimming = mad flickering

Thanks first time I've seen F3 mentioned, previously it was F7 (which is OK)/.

F3 is indeed open circuit and it's on the top of the board so no need for much disassembly, if you can get the iron tip in there.

Thanks again.
by a_q
Wed Nov 06, 2019 4:06 pm
Forum: ThinkPad T430/T530 and later Series
Topic: T430 Backlight dimming = mad flickering
Replies: 14
Views: 1515

Re: T430 Backlight dimming = mad flickering

What about this "LED Board"? I have a T430 with no backlight (you can see the dim logo on the screen). I found a LED board on ebay (e.g. part number 94V-0 CN0404) but it doesn't look man enough to be a DC-DC convertor (i.e. drive the backlight)? It only seems to have a few resistors, caps, diodes an...

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