Just a guess, could it be the limiting resistor for the backlight something about 10 to
15 ohm ?
The ceramic body and the black surface points to a resistor type device.
It looks like a resistor type device however I'm not sure I understand why a resistor would be present here.
Its in series with the positive power supply line to an LTC1932 which is a constant current source LED driver. That has a current limiting resistor to one of its pins and takes care of all the LED's power needs. It drives 8 white LEDs in series with its output. Brightness control is done via PWM onto the shutdown pin as far as I can tell (as per the datasheet).
So no, I don't think its a limiting resistor. It could be a resistor there for EMC filtering though. On the same board is the touch screen circuitry which will be noise sensitive. It could also be some kind of hybrid EMC type filter although two pins narrows that down a lot.
I can't find any resistor numbering which would result in the letters LB being printed on the chip. If it is a resistor, I need to work out what value to replace it with :-/.
Cheers,
Richard
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