(10-14-2022, 10:08 AM)9bar Wrote: ***SOLUTION***Thanks a lot for your quick answer. I very much appreciate. I'll let you know when I did it, I need first to find the transistor cause I don't have this one in stock.
Hello Batchas,
Thank you very much for the probes ad the full explained pdf; this make much faster for us the work :)
Looking at the pdf with the FK schematics we think that the issue is more the Q1 than Q16 as you suggest. (you was very near to solve the puzzle ahahahah)
This may happen when you draw too current into the DC interface; which is probably what happened with the walkman in the other case.
Component Q1 is a transistor and you can change for the IRLML6344, which is the one appearing in the schematics too.
In the newer FK we use PJA3400 (package SOT-23) which is more difficult to find but more reliable.
Swapping it should solve the problem; if not remember that you can repair for free if is still under warranty, or by paying the service if is not; (which should be less expensive for you because we already found the issue XD )
Update us if you swap it and solve it :)
p.s. Under the text where you post you can attach any type of file you would like :)
About post and text edit, attach file: yesterday I was unable to access the full text, only the quick edit. But today it's like magic. Everything's possible! Full editor and so on :)
BTW, how do I recognize the board if old or newer? I see PR2 written on it.