Tihones

Clean all ..remove igbts ..start by primary side replace 10 ohm resistors and bad igbts...this design have 12 fet 8 for inverter operation 4 for reverse conect protect...repalce all bad fets


Go to secondary side ...remove all igbt clean all ...now crtical this inverter igbt turn off at 0 voltage so no 5.6 zeners all zeners in red orange color are a 16vdc zener...with all igbt off and fets are fited u should get error 05 and 370 vdc on big caps ..put ur meter on vdc and test all voltage on zeners u should get 16vdc if this low then ur coplers are shorted u must geet 16vdc on zeners by the way there are only 3 zeners 2 underneath board one is so far near smps...strange it feels 3 zener for 4 igbts but that is. True

Now if u get 16vdc on zeners ..put ur meter on voltage scale and turn on the inverter is all ok u should get 1.5 to 2.5vdc that appear momentarily between gate and emitter for igbt one by one in all igbts ...if that happen put all igbts in solder well pay attention to 10 ohm or 47 oh. R if any open...and u should now get 220ac