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Learn Electronics Repair #050
Fujitsu Lifebook A Series A514 Laptop Motherboard, Component Level Repair
This Fujitsu laptop is faulty. The battery charges OK, you can start it by pressing the power button, but you can not switch it back off without removing the battery. The blue power LEDs come on but it does not start up, no fan spinning, no boot, no picture, no backlight - Nothing. Nada. Zilch.
In this second part we use the information we found using component datasheets to trace the fault by measuring voltage rails and checking various EN and PWM signals using a multimeter.
I work in collaboration with:
The Electronics Channel (with Carlos and Detlef)
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Gran Canaria Uncovered
/ @grancanariauncovered (with Detlef and Julie. Not electronics related)
Det Builds Stuff - / @detbuildsstuff (Detlef)
Retro Upgrade - / @retroupgrade (Carlos)
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Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.
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Thank you
Richard

Опубликовано:

8 сен 2024

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Комментарии : 20

@LearnElectronicsRepair 3 года назад

I would just like to add - this laptop is still working, weeks after I 'repaired' it :D

@89Ssik 29 дней назад

The Voodoo element was with you in this one!

@supportvital8005 2 года назад

Hi Richard, When I saw the first few seconds, I was pretty sure that you were going to announce that you had found a short on the motherboard with the back of your right index finger. I enjoy your videos, thanks.

@Xorat 3 года назад

I really learned a lot about Chips and enable signals in this video, even if it had nothing to do with the actual magic like fix. Really enjoyed those 2 parts thank you very much!

@LearnElectronicsRepair 3 года назад

I think what happened here was the SIO chip was kinda 'frozen'. I have seen this mentioned elsewhere - and with me removing the CMOS battery for some time it was similar to resetting the BIOS and it started to work. All the EN signals that I was tracing do originate at the SIO and I was expecting to prove it was faulty, or at least suspect, when the laptop started to work. The SIO is responsible for powering up all the voltage rails before handing control over to the PCH which starts the clocks (oscillators) and then the CPU. The laptop is still functioning since the 'repair'

@TheGeekAid 3 года назад

I just had the same Laptop with same issue and it was the cmos battery too. liked and subscribed

@LearnElectronicsRepair 3 года назад

Welcome to the channel. Good to hear the video helped someone :-)

@Dutch_off_grid_homesteading Год назад

Heya, I learned a lot I understand that the differant cpu's (ic's) have there own psu. maybe you are write with the super I/O IC I wouldn't trust it do.maybe do a 12 hour time run to see if it stayes good

@raulblades8911 Год назад

thank you!!

@djglitch2.031 Год назад

When you took out the cmos battery, the pin looked slightly discolored. I wonder when taking it out you scratched the rust off of it enough for the connection to work again. Could be wrong but that to me seems like the only connection (pardon the pun).

@ohmware2020 3 года назад

more motherboard repair video... god bless your channel, thank u

@LearnElectronicsRepair 3 года назад

Great to see you enjoyed it - yes I will definitely be making more component level motherboard repairs - desktop and laptop :-)

@ohmware2020 3 года назад

@@LearnElectronicsRepair nice one.. i really enjoy your contents... keep it up

@Claudio982 2 года назад

Thanks a lot. You Just saved my laptop.

@LearnElectronicsRepair 2 года назад

Glad to hear that

@theshemullet 2 года назад

Just my opinion but at 38:07 there is a good view of the chip and in the bottom right corner something looks different. There's a connection that's shiny compared to the others. I wonder was there a bad connection that you cleared while probing or possibly a bridge that you cleared. Not sure, just a observation. Thanks for the videos they are great help. Hello from Ireland