| Electronics > Beginners |
| Learning motherboard repair |
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| SolderOcelot:
Why this topic? I've been wanting to learn computer motherboard repair for over 1.5 years. You would think there is plenty of resources out there but I strongly disagree. I've learned so much by my self on the internet (cooking, coding how to do a double windsor tie knot) but when it comes to computer motherboard repairs, I find that Louis Rossman, iPad rehab and even Sorin jump right in the middle and don't really consider beginners. What's the device? It's an old Lenovo laptop with a faulty motherboard. I can replace the motherboard for $ 38 but that's not the point of this project. Model: Lenovo x220 Motherboard part number: 48.4kh17.021 Facts * Symptoms: No power, no boot, no charging led * Charger has been checked and replaced * DC jack has been replaced * DC jack connector on motherboard has been measured with multimeter * In the past (while the mobo was still faulty) I have been able to get the motherboard to power and boot laying bare like this (with just keyboard and hdmi cable attached) * CPU gets warm when motherboard is connected to DC jack for over 5 to 10 minutes Question * What's the sensible next component to check without using schematics and why? * Shouldn't I have 20.5V on the black to ground point where I have 0V now? Please bear in mind I'm an electronics beginner and so extra info on your comment is appreciated. |
| tszaboo:
Check all the fuses. That PCB looks damaged, maybe try to clean it and see if it is in one piece or charred and dead. |
| SolderOcelot:
--- Quote from: NANDBlog on November 13, 2019, 03:20:10 pm ---Check all the fuses. That PCB looks damaged, maybe try to clean it and see if it is in one piece or charred and dead. --- End quote --- Thank you. I've cleaned it with IPA multiple times and since it powered on before after I played with it for hours, I have a feeling the PCB isn't broken / damaged. Good point on the fuse. |
| Jan Audio:
Put in oven after removing all plastic. |
| SolderOcelot:
--- Quote from: Jan Audio on November 13, 2019, 05:12:10 pm ---Put in oven after removing all plastic. --- End quote --- Thanks, what spices should I add? |
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