Judge issues must be handled after hsien Chu, clear, severe, small problems. Short circuit LED fluorescent lighting should be the highest priority.
1, resistance detection method, adjust the multimeter to resistance, detect a normal circuit board of a point of resistance, then testing another piece of the same circuit board with a points test and normal resistance values are different, different if you determine the scope of the problem.
2 voltage detector, multimeter voltage regulation, detecting suspect circuit voltage of a point, are similar to the normal, or determine the scope of the problem.
3, short circuit LED Flood Light Supplier detection, adjust the multimeter to the short block (some diodes voltage drop or resistance stalls, usually with alarm function), checks for short circuits happen, after finding the short circuit should give priority to, so that it does not burn out other devices. The method you must do so in the case of power off circuit, preventing damage to the table.