Acer AL1713bm AL1713 Service Guide - Page 31

3. QPI PCBA Troubleshooting 3.1 Is there DC12V & DC5V at #6 & #8 of CN852? NO YES Check F850 & D850 Is the voltage at C854 in the range of 127V~339V? YES NO Check R855, R857, R852 Is the voltage at #3 of U850 16V? YES NO Check R859 Is the voltage at #6 of U850 0.8V? YES NO Check D853, D854 Is the voltage at #6 of T850 38V? YES Check Q851 30