Modern computers have a lot more software than you would think, obviously there is the OS but there is also a bunch of firmware that all gets run long before any OS kernel starts. Some googling and I found a schematic for the motherboard (or at least a similar motherboard) this gave me enough places I could check for voltages, all of which seemed to be okay and in the expected range. Looking at the board there weren’t a lot of capacitors on the motherboard and the ones there didn’t look damaged/bloated (Obviously a bad capacitor can still look “normal”). Next guess was it could be power related, perhaps a missing power rail or a faulty/dying capacitor was causing power problems. It’s easy to do while I had the laptop disassembled. I did replace the thermal paste under the heat pipe adapter on the CPU just in case that was a problem. Unfortunately it didn’t make any difference, a quick check with my finger didn’t show any parts of the board that were particular hot/warm in places it wasn’t expected, unfortunately that’s all I could do with my limited test gear (anyone want to donate a Flir camera?).
With some of the covers off its easy enough to blow some cold air over the motherboard and see if it makes any change to the boot-up process. My first guess was it might be temperature related as leaving the machine off for awhile seemed to improve your chances to get it to boot-up. Diagnostic Process 🩺Ĭlearly the hardware seemed to work, at least some of the time, obviously it was some kind of intermittent problem preventing the hardware from booting all the way. I do however hope that some of this information will be useful to those who are brave enough to attempt fixing this issue themselves.
Laptop lenovo b590 how to#
⚠️ Warning This is not a guide on how to fix the problem.
Laptop lenovo b590 windows#
On the odd occasion that I got the machine to actually boot-up and start Windows 8.1, the machine seemed to be reasonably stable, however if the machine turned off it’ll often not boot back up. Pressing the power button caused the fan to spin up, LCD backlight to come on and the LED’s to come on however the machine didn’t go any further, holding the power button for ~20secs got it to switch off again, occasionally it would actually boot-up. Getting the machine to boot was harder than it should be, it seemed to only boot-up randomly. Searching for information on Lenovo laptops, it appears though that this is a relatively common problem. This entire process took way longer and was way more complicated than it should originally have been and is probably a few day’s (at least) worth of googling, reading and thinking. The main problem, and reason it landed up with me, is that it was randomly turning off. My father-in-law dropped off his Lenovo B590 laptop that had a few peculiar issues. Notes on repairing my father-in-law’s Lenovo B590
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