Lenovo ideapad 5 windows 11 update disable charging circuit?

[bogart219]

That's bad if the resistance measurement is correct


PQ6204 is the high side MOSFET, if it's shorted S-G hopefully the RT6585 detected the fault, that's why the 3.3V and 5V supplies don't work

You can remove PQ6204 and measure it outside the board to confirm, set the hot air to 450-460 C

With the MOSFET removed measure again S-G pads on the board, resistance should be higher
If the MOSFET is shorted S-G outside the board, it's definitely faulty

Always measure resistance without power applied, don't connect the battery/charger until the MOSFET is replaced with an appropriate one
Charger won't work anyway as the TPS65994 is missing from the board

Dammit, I measured S TO G AGAIN ON 6204 and got 1.7 meg. (I tripled checked this time). My bad. Thanks for the hot air setting too btw.

[m1ch43lzm]

I can't think of anything else that could cause the 3.3V and 5V supplies to not start, but the LDO outputs work
Maybe an out of spec resistor in that area, compare with the schematics, page 60 and the boardview

With power removed (no battery, no charger) measure resistance across PR6204 and PR6205, should be 2.2 ohms (meter may read a little higher due to probes resistance, note the value of the probes touching together)
PR6201: 15K
PR6202: 5.1k

With only battery connected, only if the MOSFETs and RT6585C IC are in place
If both enable signals 3VALW_EN and 5VALW_EN are present (3.3v) and the outputs at the inductors are not shorted to GND, it should work, supplying the 3.3V and 5V at the inductors PL6201 and PL6202