08-18-2016 11:46 AM
I have been using a Lenovo Y510p since the beginning of 2014. It worked perfecly fine till a couple of weeks ago when it suddently turned-off while I was watching a video. From then onwards, it wouldn't start. Novo button or power cycling wouldn't help either. Since it is out of warranty, I took it to Geeksquad to see if they can diagonize the issue quickly but I was said the problem could be deep rooted and it needed thorough trouble shooting.
I came home and started disassembling the unit part by part (Take out Hard Disk, Optical Drive, RAM, Wifi Card etc) to see if I could isolate the problem but the laptop simply wouldn't turn on. Suspecting that the mother board could be the problem, I purchased an used motherboard on ebay and swapped the existing one with this and assembled all the components back to their place.
This time, when I power on, the keyboard would glow and I can see the heat dissipating fan spinning but it would spin for like 3-4 seconds and then it would stop and the laptop would power off. Then the laptop would start again, the fan starts spinning and stops after 4 seconds and this enters into a loop. All this while, the screen is totally black and doesn't display a thing. F9 or any other buttons are of no use. Novo button is of no use either. The laptop enters into the same loop with Novo button too.
Would this mean that my CPU has given up on me? I request your kind help!
08-19-2016 09:09 AM
Hi Shyam2026 ,
Welcome to the Community Forums.
You can check on power checkout guidelines (page 21) ensuring that the ac adapter is not a possible failure point checking any power port issues physically at the same time. Try powering the system without battery , harddrive and with single modele RAM (to try to swap RAM on each slot at the same time ) .
Having ensured heat and fan assembly have good contact , it may just leave us with possible CPU issue (to check for missing /loose pins and CPU secure screw is ok.
It would be handy if there is any spare machine to test the CPU before purchase .
08-22-2016 09:50 AM
Thanks for the feedback. One thing changed between last time and this weekend. I disassemble all the components (including the CPU) and put them together back in their place again. This time, when I power on, the system does not go into a reboot loop but it stays powered on. However, there is nothing on display. Not even the Lenovo Logo. Novo button is of no help either. However, the keyboard backlight is working fine and the brightness levels too. Talking about the display, in a dark room, I can notice a white hue on the monitor while the laptop is powered on (connected only the AC adapter and removed the battery) and the hue disappears and the screen goes completely black once I turn it off. So one problem of reboot loop seems to have been solved but I can figure out what is wrong with the display. Any and all suggestions/trouble shotting steps are appreciated.
I did check the AC power adapter and it is working fine.
08-22-2016 10:12 AM
Hi Shyam2026 ,
Any display when it is connected in an external monitor ?
Would the cap / numlock go on /off when pressing the keys?
Response of the keys would indicate the on the systemboard level I/O is working as machine was able to interpret the key punched and respond correspondingly to the assigned LED going through the board.
If it fails to do it , then its considered failed POST ( power on self test ) .
Not unless we can try the CPU on another board , we are at this point not sure if we may have a bad board or processor. Can you try it again without any memory stick as it should beep indicating that the board knows that ram is absent.
08-23-2016 09:55 AM
Thank you Spidely101, for your assistance.
I did further troubleshooting as you suggested, yesterday and below are the results.
<<Any display when it is connected in an external monitor ?>> - No. Connected it to another display through HDMI and that other screen would be blank too.
<<Would the cap / numlock go on /off when pressing the keys?>> - Yes. Both the Caps Lock and Num Lock LEDs would glow upon pressing respective keys.
<<Not unless we can try the CPU on another board , we are at this point not sure if we may have a bad board or processor.>> - Still trying to get my hands on another laptop where I can swap the processor and see if the CPU is the issue. Currently, I have another laptop (Company provided work laptop) and I would be jobless if I try this on it
<<Can you try it again without any memory stick as it should beep indicating that the board knows that ram is absent.>> - This turned out interesting results. I have 2 RAM modules of 4GB each. The laptop has two slots. One slot slightly below the other. Here are the test results.
I had a closer look at RAM2 and it looks like it's damaged while I was trying to disassemble it. The screwdriver seems to have made a scratch on it. So I am assuming RAM2 is dead and that is what caused the laptop to go into Reboot loop though it is inserted in the upper slot. However, the laptop seems to be recognizing RAM1 but still a blank display.
Kindly suggest any other troubleshooting steps that you can think of. I will in parallel pursue the step of testing the CPU in another laptop.
08-23-2016 11:16 AM
Hi Shyam2026 ,
Did you order the new motherboard with the same FRU part number as the stock board ?
The way it goes is that the power coes into the system , input caps/ num lock able to output on the leds , backlight on onscreen also ok but a graphic chip or CPU integration fails to project output signal even on external.
I think we're still stuck with probable board vesus processor specially assuring that heatsinks are thermal paste inplace.