![]() ![]() I do not think i am capable of fixing the fan. The impeller is not stuck (it can easily rotate even if i blow on it with my mouth). I can confirm that during POST I have 5v on the DC in and FAN Start pin is pulled up (+5v). ![]() FAN ID (out) -> no idea what this is about.The memory module is indeed faulty because I plugged it into another system and that failed as well to boot. The FAN failure message comes on the screen and the the laptop shuts down. however, POST still fails due to FAN failure.i have replaced the memory module and now the laptop starts (screen is on).The schematics were exactly what i needed. Some say that heating up the video chip will bring things back to live, albeit temporarily.īesides heating up the CPU/GPU combo, do you have other ideas? Some things I could check or a reliable source where I can download the schematics (i do not mind to pay for schematics, but the sites I found online looked a bit dubious…). checked power to the fan -> the fan does receive power (5v) but it does not spin (the PWM pin is not energized)Ĭhecking the Lenovo forums there are some users complaining about similar issues, but, unlike myself, they all have discrete graphics chips (usually Nvidia).checked power to the disk drive -> no power. ![]() removed the heat sink -> when i power on the laptop I can feel the CPU die getting hot.So the chip is not dead because it does run the POST (to a certain point i believe). removed the memory module -> when I power on the laptop I can hear 4 (3+1) beeps.removed all non-essential components (wireless card, disk drive) -> still the same problem.removed the board and visually inspected in -> all checks out.There is no display (built-in panel or external monitor). ![]() The behavior: the power button lights up (green), but that is about all the laptop does. The CPU/Video Chip are from Intel (i7) and they come as a single package with 2 dies soldered onto the motherboard. Whilst the laptop was powered on (plain web browsing, nothing fancy) Windows crashed with a blue screen of death. – Remove bottom cover (search Youtube for a removal guide for your model) –īe careful, I broke 2 small plastic retaining pins towards the back lip where the external battery was.I have a Lenovo ThinkPad T460 (board is BT462 NM-A581 Rev:3). Just had to reset the date and time on start-up and all seems to be working fine again. Just remember there are 2 x internal batteries to remove as well as the external -)ģ0 seconds holding the power button once all batteries removed and hey presto, it came back to life. Went through each step in sequence and solution #3 worked for my son’s Lenovo T470 :-)įrom tears and upset thinking he’d lost everything to a big hug and a happy 11yr old again :-) Forgive all when that baby’s back, powered on and rockin!.Contemplate your brand selection process.It’s hard to update the BIOS when your computer wont turn on so….*Don’t put the shell back on yet, only do that after confirming everything has been reconnected correctly.Remove bottom shell of the laptop – Search YouTube, your laptop’s support website or the IFIXIT Repair Guide site:.Last chance garage – give that little ole battery a kiss & a rattle in the hand like a pair of dice and pray for power! Remove both removable and internal Batteries.Remove bottom cover ( search Youtube for a removal guide for your model).Solution #3 – Fully Drain All Power (internal batteries)Ĭompletely drain all power from the laptop – some disassembly required. Press and hold the Reset Hole for ten seconds with the paper clip.Locate the Emergency Reset Hole on your laptop.Yes, your expensive Lenovo laptop came with an emergency reset hole. Press and hold the power button for 30 seconds.If your laptop has removable batteries, remove them.If this works, think about buying a lottery ticket. Solutions – try the solutions below one at a time until your laptop fires up Prevention (sometimes) – Update your Lenovo laptop BIOS! Below are solutions to get your laptop powered back on and running. Your laptop is now a very expensive but not construction worthy brick. No beeps, no BIOS post messages, no keyboard backlight, nothing. In this state the Power LED indicator light may do nothing when pressed, or may blink 3 times but the laptop remains idle with a blank black screen. An affected laptop may be fine one day but wont power on the next. Issue: Several Lenovo laptop models have had issues returning from sleep, suspend or hibernation mode. ![]()
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