Callouts: Power board ANOVA_PRO_POWER_REV01 - bottom side

Source: FCC ID 2APBOAN600, internal-photos exhibit 3999178 (2018 sample), page 3, bottom photo (991x371); flipped top-to-bottom vs. power_top
Annotated image: images/annotated/power_bottom.png

#	Ref	Identification	Part / marking	Category	Confidence	Notes
1	J8	30-pin FPC connector to main board	30-pin 0.5 mm FPC	Connector	confirmed	Ribbon to main board J8. The interface pinout between the boards is a key Phase 1 task.
2	TP1-TP3, TP29-TP33, TP39	Test points beside the FPC		Debug / programming / test	likely	Convenient probing of rails and signals entering from the main board.
3	L1	DC/DC buck inductor 6.8 uH	shielded SMD inductor marking: 6R8 / 1822	Power	confirmed	Part of a switching regulator with output caps C17/C31. Probably makes the logic rail (3.3 V?) from the AC/DC output.
4	U2	IC, unidentified (pins on two sides)	TSSOP/QFN class marking: illegible	Unidentified	guess	Biggest IC on the power board. Candidates: buck controller, power-board MCU, or sensor AFE. If it is an MCU, it has firmware too, which matters for the update-failure analysis.
5	U3?	IC, unidentified	TSSOP/QFN class marking: illegible	Unidentified	guess
6		small QFN IC, unidentified	QFN ~3x3 mm	Unidentified	guess
7	U11	small IC (SOT/DFN)		Unidentified	guess
8		6-lead SOP IC + power resistors (20 R, 51 R)	SOP-8 body with 6 leads; resistors marked '200' and '510'	Power	guess	Under the AC/DC module area. Missing pins suggest a high-voltage part: offline regulator, triac/MOSFET driver or opto. MAINS POTENTIAL.
9	TP9	Test point at the root of the sensor finger		Debug / programming / test	likely
10	R57	Sensor-finger tip: component footprint	2 pads at the tip (silkscreen 'R57')	Sensor	guess	Likely the water-temperature sensor (NTC/thermistor) position. Measure resistance vs. temperature on the real board.
11		Through-hole joints of relay, fuse and mains terminals		Power	likely	MAINS POTENTIAL. Never probe with the unit plugged in.