Today i serviced a Lenovo 500s laptop that wasnt turning on or charging. I first test charger using on another computer and it was charging fine. Performed battery reset by removing battery and charger for then pushing and holding power for about 30 seconds to 1 minute. then connected charger only then tried to power on, but still no response. Next checked to be sure that charger was making proper connection to DC Jack and it was tight fit.
At this point laptop needs to be disassembled to test power to main board. (Board will be replaced)
First start by removing charger and battery to prevent shorting or shock.
Next remove 3 screws at bottom that hold back cover on. Next remove Hard Drive by removing 2 screws, then slide out of dock.After removing all screws (including the 2 holding the fan) turn laptop over then remove keyboard. To remove keyboard, use thin pry tool (at the top) and slowly releasing section of keyboard from left to right and remove ribbon. Remove all connectors then with pry tool separate palm rest from bottom casing. Next remove all connectors once again then screws from board, then remove.
NEW MOTHERBOARD PREP:
Remove fan and heat sink then clean. If your new board doesnt come with processor remove also. Be sure to clean old Thermal Compound before transferring to new board. Be sure not to apply too much Thermal Compound. This should be a good enough amount.Reassemble Heat Sink with screws in order according to numbers . Then reassemble laptop.
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