Hello, this is my first post.
I found one of my Fenix E05 wasn’t working anymore, so I disassembled it (thanks to this post ). The led is working, so the fault must be in the driver circuit.
On the tiny pcb there is an IC marked CFC1H, I found on some Chinese forum that it could be a PAM2803 (Data sheet ).
Can someone confirm this? Is there someone who traced the circuit from the pcb?
Many thanks
Before you do all that, connect a cell to the head with a piece of wire to see if the LED lights up. Sometimes a leaky cell can cause corrosion between the spring and body.
@eebowler, I hoped it was a bad contact issue, but the cell was not leaking, and just to be sure I swapped the battery housing with my other Fenix E05 that still works. I also measured the impedance between battery contacts on the faulty head and compared to the working one. On the working one I measured about 4 kΩ, on the faulty head it was infinite.
I also measured impedance between pins 1 and 6 of the IC, expecting a very low value because of the inductor, but I got infinite. I am not sure but it seems to me that one solder joint of the inductor is cracked. I’ll check when I can use a microscope and let you know.
My Fenix E05 is now fixed
As you can see from the photos, the inductor core is damaged (in the first photo the broken piece is still attached to the red resin).
Maybe this caused the bad soldering joint, which after some time cracked.