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#Lenovo b590 change lcd serial
The BIOS/UEFI on laptops is often stored in a Serial EEPROM Chip, one of the common manufacturers for these are Winbond and they’re often in a SOIC8 package, a quick look at the motherboard and I found 2 possible chips. Now that I had a reasonable guess of what might be wrong it was time to see if I could prove it.
🗒️ Side note I’m old enough to still remember the Chernobyl/CIH virus from the early 2000’s that would corrupt the BIOS by writing to the flash chip and which prompted many motherboard manufacturers to have dual BIOS flash chips so you could switch to an older untouched BIOS to recover.
#Lenovo b590 change lcd upgrade
Slowly I started wondering if the BIOS could’ve gotten corrupt, perhaps an upgrade failed or some flash chip had a few critical bits flip. On the few occasions the machine did boot I could also never get into the BIOS or get any of the other boot-up menus to show up so that I could make it boot off another device.
#Lenovo b590 change lcd software
On one of the odd occasions the machine did boot I ran the Lenovo Support / Diagnostic software in Windows, it didn’t show anything wrong, however I noticed that the Model No, Serial No and BIOS Version No fields were all blank which was very odd. 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.
#Lenovo b590 change lcd how to
⚠️ Warning This is not a guide on how to fix the problem.
#Lenovo b590 change lcd 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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