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12v 3000w inverter repair help

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Hi all. 
First time post for me
I’m after some help
I am trying to repair a high frequency 3000w inverter.
It worked great for 3 weeks when I got it (after replacing 2 IGBT’s)
But then they blew and many more replacements

I bought a new spwm board from the manufacturer and a complete new set of IGBT’s along with their associated resistors and diode.

Installed. And nothing. ABout 10 seconds in and one of the h bridge drivers exploded.

So I ordered an EGS002 board from amazon. All pinouts exactly the same. Same chips as the spwm from the manufacturer only a third the price.

I have installed this and tested all components around it including the IGBT’s. They are all good.

The IGBT’s are getting a steady 390vdc source. 
The spwm getting a steady 5v and 12v
But I can’t get an output. I can hear the transformers buzz for 3 seconds then stop I get a blip of up to 8vac at the output. 

The spwm board flashes out the code for under voltage and over voltage. 

Where do I go from here? I don’t own a scope. Only a ddm. 

I have checked and re check all components and solder joints.  But as I don’t own a scope, I can’t think what else to do.
Thanks in advance

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Without a circuit diagram it is very difficult to help you.  You can find numerous videos on youtube.com related to "EGS002 "   that maybe helpful. Good luck.

Looks like I was born under the sign  -V  (I talk to much?)


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I got myself a usb scope.   

I found that the egs002 wasn’t giving the correct wave.  On outputs 1 and 2.   And output 3 was a constant 6v.  Not a wave at all.    Got another egs002 (before getting the scope). And that had one dead output.

Attatched is a schematic for the egs002.   And the h bridge.  Which although not for my inverter, is identical   



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