Hi,
Yesterday after three weeks of absence I plugged PSU to my laptop and it refuses to power on while power LED is barely blinking periodically. PSU is squeaking periodically when it's plugged in to laptop like secondary is shorted. Tried another PSU, same.
After inspection I found one shorted SMD capacitor C77 (see pic) on laptop motherboard. Shortly after PSU is plugged in it get's very hot and I believe it's the reason of the problem.
What replacement capacitor shall I use on it's place? What value? Does anybody have schematics to check this?
Is it logical it's same value like C139 located under? Would I take out C139 to measure capacitance?
Original bipolar SMD capacitor is not available in local shops. What substitute can I use for it? Can I use standard polarized aluminum or tantal caps? What do you think is best? I guess original cap is 10uF/6V bipolar ceramic or similar...
I must use the laptop ASAP as all my work is there, I need quick solution.
Thanks in advance!!!
Suad
Yesterday after three weeks of absence I plugged PSU to my laptop and it refuses to power on while power LED is barely blinking periodically. PSU is squeaking periodically when it's plugged in to laptop like secondary is shorted. Tried another PSU, same.
After inspection I found one shorted SMD capacitor C77 (see pic) on laptop motherboard. Shortly after PSU is plugged in it get's very hot and I believe it's the reason of the problem.
What replacement capacitor shall I use on it's place? What value? Does anybody have schematics to check this?
Is it logical it's same value like C139 located under? Would I take out C139 to measure capacitance?
Original bipolar SMD capacitor is not available in local shops. What substitute can I use for it? Can I use standard polarized aluminum or tantal caps? What do you think is best? I guess original cap is 10uF/6V bipolar ceramic or similar...
I must use the laptop ASAP as all my work is there, I need quick solution.
Thanks in advance!!!
Suad
Comment