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Old 01-17-2020, 08:37 PM   #1
kuba2102
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Unhappy 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 at 08:38 PM..
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Old 01-18-2020, 09:26 AM   #2
kuba2102
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Default 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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