TS100 Fix (Sen-Err / overheating) - MOSFET replacement

This video shows how to fix a faulty TS100 soldering iron which immediately heats up the tip after plugging it into the power supply.

I am quite confident that I found the reason why some TS100 are failing with shorted MOSFETs:
1. A faulty tip can short out the MOSFETs source and drain pins, which will induce a very high current through it.
2. The current seems to be mostly limited by the power supply, which is often a simple laptop charger with a current limit protection of about 2.1A, which is within the specifications of the original MOSFET.

However, if you use a power supply with which can deliver more than 5A, you risk that the maximal current (5A) of the MOSFET is exceeded and you burn it - when the tip fails.

This is also the reason why I have chosen a MOSFET with -6.9A.

Here are some replacement MOSFETs:
HM4953A or CJQ4953 (used in TS100)
SI4925DY (the one I used, with -6.9A)
SI4925DDY (the same as above, but -5A)
SH8J31 (-60V, -4.5A)
IRF7328PbF (-30V, -8A)
IRF9362PbF (-30V, -8A)
AO4801A (-30V, -5A)
any other P-channel dual MOSFET with -30V and at least -5A

Music: Candlepower from Chris Zabriskie

Видео TS100 Fix (Sen-Err / overheating) - MOSFET replacement канала tamasgal