Is there a way with a PC or something to check a 4 in 1 ESC?
You can check one I think with a pwm generator @Steviegeek ?
Think one of my battery meters has a PWM output. Can defo test servos
If you have an old PWM receiver thatās the easiest but if not a square wave signal generator can do them one at a time, just need to set right pulse width and suitable frequency.
A PWM output from a servo tester is also pretty ideal 
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Well all thatās well above my pay grade 
How did you get on Nick? Have you tried an earlier build of Betaflight? 4.2 or 4.3 ?
I did thanks mate, Iv reached out to the manufacturer as to get the most up to date software, Iv since moved on to my Nazguls. I have 1 with a dodgy motor I think ?, and the other binds to the everything but I have no controls?. I thought it was just a case of 1 of the ground wires which had broke of the vista, but when soldered back on I have none of the above.
Iv not plugged it in yet so not sure whats going on??,
Just lighting a fire under this one again as the weather is shite I decided to revisit it, and discovered I have continuity between earth on the FC and the 4th motor on the ESC. Now not sure what this means other than its knacked but which side FC or ESC ???..
Itās tricky just measuring continuity on a pcb. Everything is interconnected. It will only tell you half a story
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Ok well tested the rest and they seemed fine just the 1, at least it gives me some direction, thing is Iāve checked the ESC and all seemed ok. Just trying to get my head round what else to check, think if I go back to the ESC now I know thereās an issue with motor 4 see whatās whatā¦
Thats a sure sign of a busted mosfet on the associated esc.
Remember each esc is a separate device. One can break whilst the others all still work.
Hmmm hereās a thought I could do 1 of 2 thingsā¦,
Plug the old Fc in and see if I get the same results or solder a motor to ESC 4 and try an run it up in BF wot you think ??
You can try it.
The broken esc should not ruin a motor or the fc.
However given the short I donāt think either will work.
You need a new ESC
Thinking about this, I may have misunderstood thisā¦
When you say to the 4th motor on the ESCā¦ what exact connection on that ESC? The 3 motor wires? If so then I was rightā¦ itās toast. If you mean somewhere else then maybe itās something else.
I do have continuity either side of this, not sure if I should but might be able to replace it :thinking
But did manage top track it down here 
Ok I can order 3 from China with P+P for $6, just need some advice as to if its knackered or not ??
You definitly should !
Thatās the current sensor very low resistance resistor/shunt. Very very unlikely that fails
Shit that blows that fault find right out of the water 
Back to the drawing board 
Fault finding electronics can be a pita. You have to weigh up time spent with what it costs to replace it. You could replace a blown transistor, only to find a feedback diode is fucked too. And so on etc.
If its not plainly obvious on a visual inspection, my advice is ālifeās too shortā mate
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I have to agree with my learned friend 
No disrespect to you, but if you do not know what the main components do, how they work, and how to recognise them, you could spend hours and hours just wasting your time.
Life is too short, just replace it and carry on flying 
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