T460s power on password factory reset9/22/2023 ![]() State everything you have tried and all the guides/tutorials/sites you have followed as well as why they were unsuccessful. Try to research your issue before posting, don't be vague. ![]() The subreddit is only for support with tech issues. Please include your system specs, such as Windows/Linux/Mac version/build, model numbers, troubleshooting steps, symptoms, etc. Live Chat ~Enter Discord~ Submission Guidelines You could stress test the laptop by playing high end games or running performance tests to see what happens.Check out our Knowledge Base, all guides are compiled by our Trusted Techs. It may be a case of replacing the fan and the ram and then waiting to see. 1.5V (or 1.35V) ram and 5V for the fan which would make it strange unless there is a problem with the 5V supply but then you would think that there would be more problems. It may be coincidence but the ram and the fan work at different voltages i.e. If open circuit here's a link to the parts for the laptop.Ĭlick on Select Commodity > fans to find the part number and then search online using only the part number to find suppliers Measure between the FAN ID wire (fan disconnected from board) and black wire to see if there is a resistance readingĭid you test the fan motor windings with an Ohmmeter when it is disconnected from the motherboard, you didn't say? Measure across the black and the red fan wires. Maybe you can see the thermsitor in the fan housing. a thermistor connected to Earth (black wire) that is also used to indicate temp to the BIOS so that the fan speed can be increased which is confirmed by the Tachometer out which is a hall effect sensor, to cool more quickly. It might be a bad coincidence, but I am also afraid of something else causing these failures.Īny advice/feedback is highly appreciated!įAN ID (out) I think is the temp sensor i.e. But I find it very strange for 2 unconnected parts to fail at the same time. I can understand a failure of the memory module. One day I’ve started it, all was fine, but after some time all of a sudden it threw a BSOD and then never powered on. The laptop used to work just fine and it’s a personal device I had for years. I am thinking of replacing it (approx $40) but then I cannot help thinking about how on earth it’s possible to have two components failing at the same time. The SMDs are absolutely tiny (majority of them are 0201) and (again) I was unable to find any schematics. 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. I have a Lenovo ThinkPad T460 (board is BT462 NM-A581 Rev:3).
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |