Hey folks,
I have a HAC-CPU-10 board here which does absolutely nothing. I couldn't find any short and I already changed M92T36 and BQ24193 with known good ones (they both work on another board). No fluid or prior repair could be detected.
The main problem is I don't have the main power rail futher than the measure point directly over the usb port. That's it. There are 5V and nothing else. No voltage on the battery connector, the BQ24193 or the M92T36.
I think I checked every capacitator and did diode measurement on the pins from the 2 ICs but I couldn't find any suspicious value (compared to the known good board).
The only difference I could find on this board is the following part, which isn't present on my HAC-CPU-20. I attached 3 pictures and I hope someone could give me a hint, since I have no clue from here.
Is there any schematic on where the power rail goes from the meassure point directly above the USB charger.
It seems that there needs to be some power on signal which seems to be missing, but I have too few experience with those boards, so maybe can help me out.
I have a HAC-CPU-10 board here which does absolutely nothing. I couldn't find any short and I already changed M92T36 and BQ24193 with known good ones (they both work on another board). No fluid or prior repair could be detected.
The main problem is I don't have the main power rail futher than the measure point directly over the usb port. That's it. There are 5V and nothing else. No voltage on the battery connector, the BQ24193 or the M92T36.
I think I checked every capacitator and did diode measurement on the pins from the 2 ICs but I couldn't find any suspicious value (compared to the known good board).
The only difference I could find on this board is the following part, which isn't present on my HAC-CPU-20. I attached 3 pictures and I hope someone could give me a hint, since I have no clue from here.
Is there any schematic on where the power rail goes from the meassure point directly above the USB charger.
It seems that there needs to be some power on signal which seems to be missing, but I have too few experience with those boards, so maybe can help me out.