Satellite L755 Power Problem

[kodox]

Board ID: DA0BLBMB6F0 REV. F0
Schematic: https://www.badcaps.net/forum/showth...satellite+l755
BIOS (Flashed): https://www.badcaps.net/forum/showthread.php?t=31424

first problem was PQ21 shorted on all legs (Gate, Drain & Source Connected) and it's a NIKOS P1203ED not AOD403 like on schematic, after replacing it and make sure all legs not connected each other everything normal. but anomalies occured when i inserted 90% charged battery to the system and plugged the bench power supply, the amperage jump to the max (5A) like shorted and the PQ21 was hot. after realizing that PQ21 is hot i check the legs of it and it still normal, but sometime (once in 10 time attempt) it can charged the 90% charged battery without consuming maximum capabilities of my bench PSU.

things done/replaced (after PQ21 replaced):
- PD2, PD4, PD9
- PQ1, PQ17
- PU1
- EC & Main bios flash

anyone had other idea where to look again?

[kodox]

Re: Satellite L755 Power Problem

Update:
replaced PQ15 same model with PQ21, same result

[kodox]

Re: Satellite L755 Power Problem

FYI this laptop is in normal operation and it can run windows if powered only from adaptor or only from battery

anyone...???

[kodox]

Satellite L755 Power Problem [SOLVED]

i can't find the cause of this strange behavior but, i can manage it to work normaly using both power source.

i just simply bridged pin1 & pin2 of PQ1 mosfet without removing the mosfet, hope this information help.

truthly i don't know why this solution could effective in this situation

[mcplslg123]

Re: Satellite L755 Power Problem

You simply cant bridge PQ1. Replace it.

[kodox]

Re: Satellite L755 Power Problem

You simply cant bridge PQ1. Replace it.

read my first post carefully sir...