I have a Dell Inspirion 5520 running Windows 7, 64 bit. Core i7, 8gb RAM. Within the past few days, I have begun experiencing random power-offs. I've researched this problem as best as I can, trying a number of different solutions. I've read other threads on an issue similar to this (including but not limited to: http://en.community.dell.com/support-forums/laptop/f/3518/t/19523029.aspx ), and posted my own thread on the Dell forum, and got a bit of good input but nothing definitive: http://en.community.dell.com/support-forums/laptop/f/3518/t/19590726.aspx
Here is what I have done thus far, and/or experienced the shut down during or after:
- Used a different AC adaptor
- Battery only (no AC adaptor plugged in, battery at or near fully charged)
- No battery at all (AC adaptor only)
- Updated the system BIOS to the most recent (A14) from a much older version (A07, I believe?) that I don't think I had updated in the past.
- Reset BIOS settings to default factory settings
- Ran the Dell system diagnostic (F12 at start-up before going into Windows). No errors. It should be noted that during these tests:
- CPU temps were within norms (as low as 45 degrees, as high as 72 degrees during stress tests. Shutdowns have happened at all times - after using for hours, when first turning on in the morning)
- Battery temps were reasonable (27-30 degrees, roughly)
- Shutdowns still occasionally happened during the diagnostic tests. This rules out (to me) a Windows issue, and there was no pattern to when it was shutting down during the tests.
- Fan was working fine (3800-4200 RPM depending on where in the test I was)
- Disassembled the computer, including removal of the motherboard. Blew dust off the board and anywhere else I could see it.
- Removed old thermal paste between heat sink and CPU, applied new.
- Close inspection of the mother board does not show any capacitors bulging or blown out, or any other sort of apparent physical damage.
- Inspected all wiring leading from the AC adapter female end to the motherboard for short or signs of damage.
- Inspected battery connections.
When the system powers down, it is as if the battery was yanked and the cord was pulled. A complete power loss. if this were a desktop, I'd have thought my foot had accidentally hit the switch on the surge protector. I've all but ruled out a legitimate heat issue (various temps, and even immediate shut-down after having been off overnight, and the fact that it has done this during the diagnostic testing suggests that it is not a software (Windows) issue.
Here's a few things I have noticed about these shutdowns:
- They seem to come in spurts. For example, the computer will be fine all day long, then suddenly go through 8 or 9 shutdowns in a row before re-stabilizing for a while. The slew of shutdowns will come during the POST process, anytime during the startup procedure, or even a few minutes after I've gotten logged into Windows.
- If I get a shutdown while running on AC power and a full battery, I can sometimes stabilize it by running off battery for a while. Not sure if this is coincidence or not.
- Approximately 10% of the time, when restarting the system immediately after shutdown, I will get a Level 1 Cache failure beep during the POST process (7 beeps for a Dell). (POSSIBLE CULPRIT?)
- Sometimes when the system has been stable, if I move it from my lap to a table, the act of setting it down will cause a shutdown as if the vibration kicks it off. (POSSIBLE CULPRIT?)
I've pretty much narrowed it down to two possible things that I could do to fix it:
- Motherboard going bad (since it seems to be a power supply issue of sorts, and with these laptops). In this case, replace the MB
- CPU going bad (as indicated by the Lvl 1 Cache failure, but I'm not sold on this since its occasional and only if I attempt restart immediately after a shutdown). In this case, replaces the CPU
Obviously, I want to choose the one that would be correct so I end up not wasting my money on a part for it to be something else. Of course, I'm also interested in workaround and other solutions I may have overlooked.
Any input or ideas there may be would be appreciated!
Thanks in advance!
Edited by soubuckeye, 23 July 2014 - 11:21 PM.