nm-a681 lenovo b50-50 no power no battery charging

[magnetepazzo]

hi guys, I have this laptop, work good with battery but when i put power supply don't charge battery and don't power on if battery it's low. Suggestion ? Thanks

[Techtiger]

Re: nm-a681 lenovo b50-50 no power no battery charging

test voltage on PQ301 PQ302 all pins for voltage PU911 pin 1.2.9 Voltage
try this Schematic

[magnetepazzo]

Re: nm-a681 lenovo b50-50 no power no battery charging

hi, thanks for reply, on pq301 in i have 20V on all pin (5 6 7 8 ) and 19.64 on rest ov pins. on pq302 i have 1 2 3 4 pin 19.64V ands 5 6 7 8 -19.50

[Techtiger]

Re: nm-a681 lenovo b50-50 no power no battery charging

test voltage on PQ301 PQ302 all pins for voltage PU911 pin 1.2.9 Voltage
try this Schematic

This is the Schematic not the first one

[magnetepazzo]

Re: nm-a681 lenovo b50-50 no power no battery charging

pu911 -20 pin 1 , -20 pin 2 pin 9 -8.50

[Techtiger]

Re: nm-a681 lenovo b50-50 no power no battery charging

pu911 -20 pin 1 , -20 pin 2 pin 9 -8.50

You have given -20 pin 1&2 it should +
Check pq301 pq302 Gate Sourse Drain in diode mode multimeter
Voltage in pq301 & pa302 pin 4 should be 4.98 to 5V
Test Voltage in PQ307B pin5 ,PQ307A pin2 PQ305 pin2

[Techtiger]

Re: nm-a681 lenovo b50-50 no power no battery charging

Test your switching mosfet PQ302 out of the MOB for me it cannot conduct supply without gate pass