Medion Akoya P6648 - Battery & Power stage failing?

[mlop7123]

This laptop died on me while on & charging, suddently turning off.

When plugged in, there was a clicking noise from inside. This is the only
sign of life. All of the LED's are OFF and nothing happens when trying to
turn it on.

I proceeded to dissasemble the thing. I've gotten down to the bare motherboard and I can say that the sound comes from it, not the HDD
or any peripherals.

I can't quite locate the source of this sound though. It's hard as it carries
through the PCB. I assume it's some inductance clicking or perhaps an arc (still have to check it in darkness to see if it is an arc, don't think so though).

The sound repeats with a frequency of 1-3 Hz.

I think it probably is the first power stage which manages the battery / plug sources (see attached pic), haven't done any testing yet but I assume it's probably the controller IC (BQ24725, labelled BQ25) or one of the mosfets (IRF8707).

I'm away from my tools so I haven't been able to do any proper testing, I'll borrow a multimeter and check the fets I guess.

Any suggestions?

thanks

[mlop7123]

Re: Medion Akoya P6648 - Battery & Power stage failing?

I tested the mosfets on the board for continuity but they seem to be ok (no beeping when testing source to drain continuity).

I know this doesn't guarantee that they are OK but I want to be sure before replacing.

I've tried to find schematics on the forum by searching for the MB model:

HannStar J
MV-4 E89382
94V-0

I've found many posts but they don't actually seem to be the same motherboard,
so I'm a bit confused. Any ideas on where to continue? Thanks

[trebo]

Re: Medion Akoya P6648 - Battery & Power stage failing?

search C15B Rev 2.0, that will be the M/B