Electronics > Repair
[FIXED!] Need Help: Acer 8930 le2 laptop keeps restarting after a few seconds
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lacta13:
Hi folks. i have the same problem with my acer aspire 8930G,my laptop keeps restarting while booting,even if i boot from a cd.
cause 2 people here said 2 solution,one soft and one hard, i tryed the soft one to boot in safe mode and indeed it booted fine. so cause it booted in safe mode,means it is the nvidia graphics cards faults?and what is the solution to that?also means it is not the tokin chip problem that another user said?
Rasz:
Tokin cap seems to be the default go to answer for those laptops when they start failing to boot, so replace it first
xavier60:
The popular replacement is 4x  330uF low ESR tantalum caps.
Near to 10 years later, they are also failing.
I also used 10x 100uF MLCCs in some which are still fine.
lacta13:
so you don't propose to use same NEC capacitor,right?cause i also found that here

so i found here in Greece this type,is that correct?

https://www.markidis.gr/en/capacitor-tantalum-low-esr-330uf-63vdc-case-e-2917-tps-smd

Manufacturer AVX
Type of capacitor tantalum
Kind of capacitor low ESR
Capacitance 330΅F
Operating voltage 6.3V DC
Case E
Case - inch 2917
Case - mm 7343
ESR value 100mO
Capacitors series TPS
Mounting SMD
Tolerance ±10%
Operating temperature -55...125°C
Capacitors features low ESR resistance value

or this one?

https://www.aliexpress.com/i/32822778493.html
xavier60:
No, the NEC Tokin capacitor was failing after 4 years in the Toshiba Satellite A200 laptops. It can't be hand soldered anyway.
It was a long time ago and I can't remember all of the details. They were Panasonic tantalums, the ESR might have been lower.
I will only use MLCCs now. They are 100uF 6V that I got on Aliexpress years ago.
With the MLCCs I fitted recently, I used Mechanic brand 138°C solder to make soldering easier.
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