Can anyone recommend a repair place to fix inverter

[Woody.v8]

20vdc

 

[Jan-DIY]

For primary IGBT stage?

 

[Woody.v8]

I have 2 leds not illuminated that should be,
LVF That should be 24vdc and LVB that should be 24vdc.
But I think the 20v is maybe a dead led as there is 14vdc across the led (which I thought was a little high?)

 

[Jan-DIY]

LVB 24DC
LVF -20VDC

 

[Woody.v8]

LVB 24DC
LVF -20VDC

That's correct, if I measure to voltages across the test pins I have LVB TP9- TP11 21.58VDC
And LVF TP23-TP21 -25.50VDC

 

[Jan-DIY]

seems weird

 

[Woody.v8]

The only board I cant test is the aux power supply board as the board in mine is a different one to the repair manual

 

[Jan-DIY]

Any damaged components visible?

 

[Woody.v8]

Any damaged components visible?

There is a small chip which looks to have got hot and 1 capacitor that the top is very slightly raised, but next to the capacitor is a little transformer type component that is emitting a high pitched squeel/crackle when turned on and stays for a few minutes , I'll get some pictures.

 

[Woody.v8]

These are all on the pre-regulator PC board

 

[Jan-DIY]

Buck stage.
Getting noisy when overloaded.

 

[Jan-DIY]

Could get very tricky.

Any controller ic in these area?

 

[Woody.v8]

Could get very tricky.

Any controller ic in these area?

I'm not sure what I'm looking for to be honest?

 

[Seadog]

Bulging caps should be replaced.

 

[Jan-DIY]

Not easy to assist now.
If -25.5v is for driving any Igbt there is a chance that gates getting blown.

 

[Woody.v8]

Not easy to assist now.
If -25.5v is for driving any Igbt there is a chance that gates getting blown.

Ok thankyou for your help so far
I will see if I can get it looked at but I fear that it may be uneconomic to repair

 

[Jan-DIY]

It can get very expensive while measuring around.
Igbt dying very quick and often expensive.
Unfortunately my selco is from older generations.

 

[eddie49]

I'm watching this thread with great interest.

I have 590vdc across the capacitor

Dividing by 1.414 ( square root of 2 ) means your AC supply is 417v. I hope that you have appropriate test equipment, with well-insulated clip-on leads rather than hand-held probes, and PPE ( at least a pair of Class 0 gloves ) ?
@Jan-DIY , in post #33 there is a Selco suggestion of using a current-limited low voltage external DC supply of e.g. 48 volts instead of the 590v DC, in order to run the IGBT inverter stage at a safe voltage for troubleshooting and to avoid excessive short-circuit currents. Have you tried this method?

 

[Jan-DIY]

Hey all.
This is what i mentioned in all of my posts.
Don’t kidding with dc bus.
And be aware of charged hv caps.

 

[Jan-DIY]

Would really like to have a view on that machine.

but it is overpriced to get it to Germany.