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Old 01-30-2018, 03:40 PM   #1
inwerp
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Default Lenovo 500-15isk - Charging/Power problem

Hello everyone.
I am new here, and i am new in the industry(i started to work in a local repair shop a few weeks ago).
I have a laptop Lenovo 500-15isk with the following symptoms:
starts with the battery, do not charge|does not see DC adapter.
without battery turns on for a second, then shuts down. Amp consumption hits 0.5A then goes back to fluctuation 0.1..0.2 with a tiny noise near the charging circuit.
Could not find schematics diagram and i also do not have enough experience to find all control voltages without it.

I would appreciate any clues and ideas.
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Old 02-01-2018, 12:41 PM   #2
inwerp
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Default Re: Lenovo 500-15isk - Charging/Power problem

So I fixed this board today. after checking chip voltages i found that VCC drops from 19v to 3.1v on one tiny resistor which looked more like a fuse. i googled a little bit and found the same exact problem with the same exact symptoms on some Russian forum. I decided to short this resistor and it really worked. It was a 10om resistor, and i replaced it with a tiny copper wire.

even though i could not find this board schematics anywhere, chip datasheet really helped me to troubleshoot this issue.
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Old 02-05-2018, 07:32 PM   #3
crash-cyberdrive
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Default Re: Lenovo 500-15isk - Charging/Power problem

Useful information Thank You for sharing.
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ViewSonic VA712B - still working on it
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