Only one of the two big boards has LINGQI on it the other doesn't.
Giandel said this was a heat sensor, something to do with the heat sensing.
Thought this funny as it didn't look as if anything on it was temp sensitive.
Over voltage could make sense, the inverter died as we left the services...
Wondering if I should change this 10 ohm resistor as it comes straight from the affected burnt out board and looks like it’s got hot at sometime must have been when the board blew out it’s giving 9.7ohm with a 5% tolerance so looks to be fine but should I change it as it discoloured as has ran...
So this little board is a very important part of the inverter and does a lot of work for such a small thing....
Unit is dead right now and all in bits, this is the best picture of U1
I removed R85 shortly after putting up photo of it the solder joint wasn't just dry the joint was nonexistent on...
Sorry, but I'm new here and this is my first post, I was searching about this very same problem as I have the same symptoms as yourself.
This is what I found... The heat sensor PCB board had blown a few components
Mostly for UK readers with our 13amp plugs but still worth a read.
Being a qualified PAT tester since the early 90s, I was trawling the internet to find a plug test card but still very hard to find since Covid and I'm still looking.
And I stumbled across this please take the time to read it...
Have had a look at the mos-fets triacs thyristors what ever this is and this one is giving off different resistance to all others but there’s no ID on it to say what it is
Has anyone got any idea!!!
This is all new to me as my normal things are disco mixers amps and lighting controllers even...