Open the casing, remove the control panel (take note of the connection should be a good marker for proper installation restored). Additionally welded with a 220V AC power line input, power test machine is still no display. Investigation 5V regulator adjustment tube Q1 (H945) c-extremely 14V, b extremely 5.9V. while only very e 1.8V, causes the power supply control circuit (MW097012G-V2) is not normal, causing failure. no short circuit load measured with the new one C945 after put, 5V power supply is normal, after recovery test machine installed, everything is normal.h3jservice manual download site