Pre-test visual inspection of thermal structure layout
Walk through the full PCBA surface to confirm all high-power components have clear, unobstructed paths for heat to spread outward to surrounding copper areas. Check that no thin signal traces or non-thermal related components block the direct connection between heat-generating parts and their dedicated thermal copper pads. Look for any leftover manufacturing residue, solder flux buildup, or uneven solder mask coverage that could create an insulating layer and block natural heat transfer. Verify that the physical spacing between heat-sensitive parts and high-temperature components follows proper design rules, to avoid unintended heat coupling before the test even begins.
Thermal path continuity verification before power application
Use non-contact observation methods to confirm every thermal via along the designed heat flow path is fully open and free of blockages from excess solder or plating residue. Trace each intended thermal connection from the component pad down to the inner copper layers or external heat dissipation points, to make sure there are no broken or narrowed segments that add unexpected thermal resistance. Check that large-area thermal copper planes do not have unnecessary segmentation or isolated islands that trap heat in small, concentrated zones. Confirm all ground connections tied to thermal structures have solid, low-resistance contact that supports efficient heat spreading across the board.
Dynamic temperature monitoring under controlled load conditions
Apply steady, rated operating power to the PCBA and let the system run until temperature readings across all key points stabilize with less than 1 degree of change over a 15-minute window. Track temperature values at every heat-generating component, adjacent copper areas, and the farthest point on the linked thermal plane to map how heat travels across the board. Watch for unexpected hot spots that appear in locations not marked as high-power zones, which point to hidden current leakage or unintended localized power loss. Record the difference between each component’s stable temperature and the ambient reference temperature to calculate real-world温升 performance against design expectations.
Post-test thermal distribution and weak point assessment
Examine the full surface temperature profile captured during the test to identify areas where heat builds up far faster than the original thermal design predicted. Check if heat can spread evenly across all dedicated dissipation structures, or if it gets trapped in small, confined sections near high-power parts. Look for signs of uneven heat distribution that could lead to long-term thermal stress on nearby components, even if all measured temperature values stay within temporary safe limits. Document every minor thermal bottleneck found during the check, so targeted layout adjustments can be made to improve overall heat dissipation performance for extended operational life.
