Part Number: TPS61165
Hello,
We have used TPS61165 as backlight driver IC for one of our products, which is in the customer pilot phase. On 20% of the devices, we are seeing that after few days of usage, backlight driver IC stops powering the display LEDs. I have checked the PWM voltage waveform, it is 3.3v, 30Khz on both good and bad units.
Our display spec requirements are 16v, 40 mA.
Below is the schematic:
I have tried swapping displays, on the same PCB, but the issue didn't go away.
Similarly, when I connect the display from a non-working device to a good board, everything seems to be working normally. Hence I am sure that issues not on the LED strip side.
I have also tried to jump wire from backlight IC to directly on the display flex test points for Anode and Cathode to rule out any connector issues but that didn't help either.
Please suggest how can I quickly identify and address the issue.