[SOLVED]820-00165 Backlight Issues

[dukefawks]

Probably a broken trace/resistor/soldering to FSET, ISET or FILTER pins. Measure on diode mode the resistors connecting to them to see if they have continuity to the LP8550.

 

[iambehr]

Resistors and traces were intact! Incorrectly soldered LP8550 chip. Backlight now works normally.
I suspect I pushed on the chip while the solder was still liquid, under the microscope the chip was slightly tilted and the balls were flattened.

Thank you for the clue.