Short on VCC_MAIN but no heat
I have a board which I am using for learning. It does not have any water damage. When I connected it to DCPS for the first time it showed current draw so I assumed it has a short. After checking VCC_MAIN line in diode mode it was confirmed that it has a full short (0000V drop).
After injecting 3.8V to VCC_MAIN line i noticed that the Q2300 was heating up. I removed it suspecting that it is to blame. But after checking the schematics I found out that it does not have path to ground therefore could not be the one to blame. Anyway I am still having short on VCC_MAIN but when injecting voltage to that line nothing heats up.
Then I tried to set current to 5.2A and increase the voltage gradually. After reaching 1.5V it also reaches 5.2A current limit and nothing gets hot. After waiting a bit I could fell that bottom of the board gets warm but I still could not locate individual component. I tried waiting longer but still nothing. I consumed almost all bottle of my freeze spray trying to locate what’s heating up.
Please note that I am using this board for learning purposes but it would be nice if I could still find the short. What would you do if you would have such a board on your desk? Thanks in advance.
Bu iyi bir soru mu?