A bit different perspective - Seen the insides of hundreds if not thousands of Converters,Inverters, Inverter-chargers, Control boards for Frig and heaters, CRT TV's, CCFL LCD, LED LCD, Plasma flat screen TV's, etc..
Suggest replacing just the defective component not the circuit module which is a bit more challenging and time consuming but far less in parts costs. As a point of reference typical parts cost for a converter repair run less than $3.00. 
PD's 9100 & 9200 series, Iota, Todd, WFCO 8800 - 8900 & 9800, Magnetek, Parallax, etc.. they ALL have similar failure modes and ALL include off shore parts even the "Made In America" units. Most failures are due to defective capacitors and can be repaired in a matter of a few minutes with the proper test equipment / tools. Even better there are several simple modifications that improve the "Boost" sensing circuits on ALL of them, Yes even the newer WFCO units. Many of the older WFCO's include the external RCMS / TCMS interface similar to the PD 9200 series. A simple push button switch and a led are all that's needed for full manual control of them.