Diagnosing and Repairing a Faulty Inverter: Tips from a Scientist

AI Thread Summary
A 1500W inverter experienced a failure due to shorted output MOSFETs, leading to the replacement of several components, including gate drivers and NAND gates. After initial repairs, the inverter powers on but triggers an "overload" LED, indicating a potential issue in the overload sensing circuit. The discussion highlights the complexity of tracing faults due to discrepancies between the schematic and actual board components, particularly with the overload and overtemperature circuits. Participants suggest checking for shorted traces and replacing suspected faulty components, including a problematic KA3525A IC and an unidentified NPN transistor. The thread emphasizes the importance of methodical troubleshooting and component replacement to revive the inverter.
  • #51
Guineafowl said:
TomG, Jim Hardy and others, I'm obliged under British social law to take you all for several pints at the local pub.
Hey folks, how many are up for a group pub crawl across the pond?:smile:
 
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  • #52
Tom.G said:
Hey folks, how many are up for a group pub crawl across the pond?:smile:
If i can get there !

Anywhere near the "Mousehole Forge" in Sheffield ? I had one of their anvils made about 1823...gave it to a friend who collects them.

I think it's a pub now ,

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  • #53
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My local, where I grew up - the Farmer's Arms. A 15th century coaching inn which sadly had a fire earlier this year. A common hazard with these traditional thatched roofs. Anyway, pub crawl starts here after the refurbishment...
 
  • #54
Seriously, 500 pounds? Most retailers would be less than $99 US. I think England has Walmarts. I haven't seen a 4093 in a power supply built since 1993. Power supplies (Inverters) is the most likely to fail on tech equipment. If your Inverter is that old, it needs to be replaced as part of prudent maintenance.
 
  • #55
shjacks45 said:
Seriously, 500 pounds? Most retailers would be less than $99 US. I think England has Walmarts. I haven't seen a 4093 in a power supply built since 1993. Power supplies (Inverters) is the most likely to fail on tech equipment. If your Inverter is that old, it needs to be replaced as part of prudent maintenance.
Holy thread revival!... etc

Inverters vary hugely in quality and price, with the cheaper ones having fairytale power rating and short lifespans. This old unit was repaired, tested, and sold to the highest bidder long ago.
 

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