Hot chips

E

Elf

Well-known member
I have two Teensy 3.5's which have a chip getting too hot to touch. One responds when plugged into USB, one does not. The one which responds can't read or recognize a microSD card.

20220422_001351s.jpg

Given the lack of new Teensy 3.5's or 3.6's, is there any hope of repairing these boards?

p.s. I would change to Teensy 4.1, but the TeensyStep library doesn't support it yet.
 
Looking at the PJRC web site and the Component Locations shown at the bottom of this page, it looks like F1.
Something is shorting, or consuming lots of current, somewhere.
Best sort that out first.
 
Ok, then check your soldering, it would only take a very small hair of solder to muck things up (Easily Done).
 
Both were purchased with pins installed. Both worked for months before failing. Is there any way to tell which component on the Teensy is causing the fuse to get hot?
 
The unresponsive Teensy reads 5.0V in and 1.7V on the 3.3V pin. The Teensy with the bad microSD port reads 5.0V in and 2.0 on the 3.3V pin. Plugging an SPI microSD card also does not work. All other functions on this Teensy work. The voltages were all measured with the Teensies installed on a board with a Recon R-78E5.0-1.0 dc down converter. A Teensy 3.2 plugged into the same board registers 5.0V and 3.3V.
 
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