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Lenovo Z51-70 Previously battery not charging now turns off after couple of seconds

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    Lenovo Z51-70 Previously battery not charging now turns off after couple of seconds

    Hello. As in the title. The laptop was originally heavily dropped I had to replace all the housing and install new SSD. Laptop worked fine until I noticed that the battery is no longer charging. I performed basic actions, and went to buy new battery, same result. When I connected the old battery back the laptop no longer stays on. It switches itself off after couple of seconds. I must say that before I replaced the housing the laptop suffered from occasional power loss when moved around, it was due to the loose screw that got stuck in-between the heatsink and the capacitor PC1123. Now when I checked the motherboard I noticed little bit overheating on the PQ305 and some cold soldering. I fixed it and the IC stays cool, but laptop keep on going down. I'm stuck please help
    Last edited by kuba2102; 01-17-2020, 08:38 PM.

    #2
    Re: Lenovo Z51-70 Previously battery not charging now turns off after couple of secon

    Hello again. I have done some measurement on PU301. First table contains voltages when battery unplugged and power cable plugged,
    Code:
    1- 20.5V
    2- 20.5V
    3- 20.5V
    4-26.3V
    5-3.3V
    6-2.77V
    7- 0.02V
    8- 0.15V
    9- 0.01V
    10- 0.01V
    11- 3.38V
    12-3.38V
    13- different measurements
    	from 0.35V to 0.7V
    14- from 0.35V to 0.68V
    15- 3.3V
    16- 0.42V
    17- 3.64V
    18- 3.65V
    19- 3.52V
    20- 1.82V
    21- 0.81V
    22- 0.01V
    23- 0.01V
    24- 6.08V
    25- 5.8V
    26- 5.58V
    27- 3.72V
    28- 20.1V
    Those measurement were taken after pressing power button and while laptop was on before cut out. Battery out
    Code:
    1- 20V
    2- 20V
    3- 20V
    4- 23V
    5- 3.6V
    6- 0.47V
    7- 3.69V
    8- 0.46V
    9- 0.4V
    10- 1.37V
    11- 3.72V
    12- 3.7V
    13- 0.6V
    14- 0.46V
    15-3.5V
    16- 0.67V
    17- 4V
    18- 4V
    19- 3.85V
    20- 2V
    21- 1.02V
    22- 0.2V
    23- 0.27V
    24- 6.3V
    25- 6V
    26- 6V
    27- 4V
    28- 20V

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