Noco GB70 repairs: one won't jumpstart, the other's completely dead

A friend of mine bought a few Noco jump starters from an auction. Two of them turned out to be faulty. Let's find out why.

Yes, it's long, as between the two of them there were four faults to track down.

For other Noco repair videos check out the SOSfix Electronics channel.
https://www.youtube.com/c/SOSfixElectronics

INDEX
0:00 Index
0:10 Going loco: two jump starters from Noco
4:12 Opening pack no. 1 (working torch, nothing else)
7:12 Checking cell voltages
8:56 Has a disconnect and reconnect fixed it?
10:02 Could it just be a faulty button?
12:17 Fault found!
13:11 A spot of improvisation
15:26 Cramming it back together
17:18 Testing
21:24 Pack no. 2 (completely dead), broken wires!
22:51 Checking cell voltages
24:53 Still not working, time for more troubleshooting
27:30 Checking voltage rails, but something's getting hot!
28:18 Checking for hot spots with a thermal camera
31:47 Out-of-circuit testing of suspect components
40:28 Second fault found: shorted diode
43:41 Now it thinks it's charging when it's not
46:16 Third fault found: another shorted diode
47:52 Fixed it!

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