puu

Not the easiest (de)soldering job due to the large ground pad, but I did it! I replaced Both FT232HQ and ADCMP671 and now it seems to work. Thanks once more for help.

Thanks for the answer, @attila I removed IC48 and soldered a jumper wire between its Vdd and PWRGD. It did not help. Then I measured resistance between FT232HQ's pins 8/12 and the ground, and it is about 1 ohm. And as I said earlier, their voltage is about 0,1V. So I suspect that FT232HQ is almost shorted inside. Now any other component is not hot. Maybe I have to order one and try to replace it. Never replaces QFN chip before, but let's see...

I'm pretty sure that this "LLS" chip is ADCMP671. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADCMP671.pdf Pin configuration seem to match: Pin 1 indicator is similar and brandinf is "LLS".:

I measured voltage in all six pins of the "LLS" chip against pin 2 that seems to be GND: 1: 2.67V 2: 0.00V 3: 0.33V 4: 0.28V 5: 4.64V 6: 0.30V I also measured voltages of FT232HQ chip. Pin 40 (VREGIN) voltage seemed ok, it was around 4.8 volts. But those 3.3V pins 3, 8 and 12 were only about 0.1 volts.

Hi, I have Analog Discovery 2 that stopped working. Any of my PCs doesn't recognize it anymore. I was measuring a voltage line that may have been up to 30 volts and when I turned on the device i was measuring, WaveForms told that Analog Discovery 2 is disconnected. There are two components on the board that get very hot (over 100°C). One is the one with six leg with marking "LLS" and other is "FTDI FT232HQ". The first one seems easy to replace, if one knows what it is. A regulator perhaps? The second one seems more difficult to replace, luckily not BGA. But the questions are, what is this "LLS" chip and if I replace these, will problem be fixed or is it lying somewhere else?