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KSGER T12 bootloop with J02 tip

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ygi:
Well you never know with cheap Chinese stuff but still, it would be some serious bad luck to get the same fault with 2 different tips.
Could it be that somehow J02 tip profile's corrupted and crashes the firmware when it tries to load it?

Richtermann:
Hello
I now found time to measure resistance in between the iron's plug contacts:

These are the values from the non working tip (J02) (nc = not connected)
1 to 2 changing all the range from 8kΩ to not connected, motion dependent
1 to 3 changing all the range  from 5Ω to not connected, motion dependent
1 to 4 changing all the range  from 1Ω to not connected, motion dependent
1 to 5 changing all the range  from 5Ω to not connected, motion dependent

2 to 3 8.6kΩ
2 to 4 8.6kΩ
2 to 5 8.6kΩ

3 to 4 7.6Ω
3 to 5 changing all the range  from 4Ω to 30Ω, motion dependent

4 to 5 changing all the range  from 5Ω to 4Ω, motion dependent

And these are the values from the similar, but working tip (JL02)   (nc = not connected)
1 to 2 nc
1 to 3 changing  all the range from 20Ω to not connected, motion dependent
1 to 4 nc
1 to 5 nc

2 to 3 nc
2 to 4 9.3kΩ
2 to 5 9.2kΩ

3 to 4 nc
3 to 5 nc

4 to 5 9Ω

Well.. obviously there's something very fishy going on..
I also noticed the problematic tip (J02) giving a rattling noise when shaking, which I didn't notice before, because the iron itself is ratling too with it's internal motion switch.
So did I really get a new tip with the very same defect as my old tip had?
Seems just so unlikely, but could anything else be the issue?

Richtermann:

--- Quote from: ygi on May 06, 2022, 01:46:15 pm ---Well you never know with cheap Chinese stuff but still, it would be some serious bad luck to get the same fault with 2 different tips.
Could it be that somehow J02 tip profile's corrupted and crashes the firmware when it tries to load it?

--- End quote ---

For a moment I though same, but then:
This station does not automatically assign internal profiles to physical tips. You have to select the matching profile for a tip manually, and the problem occurs no matter what tip is selected in the menu.

ygi:
There's no more room for doubt, the heating coil's broken (that's the rattling noise) and is now electrically in contact with the grounded metal housing. A good tip would have something like 4~6 megaOhm between the metal cartridge body and both + and - terminals of the heating coil. That's a one-way trip to the trash for that J02.

Richtermann:
OK then.. guess I got to buy another one!
Thank you all! :)

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