Dell Laptop Misbehavior on Booting Repaired
One of my old customers referred his friend to me for his laptop problem he has stating the problem as laptop is misbehaving intermittent due to virus infection. As per my initial diagnosis I found that on booting dell laptop it stuck on login screen neither keyboard is responding nor touchpad.
After so many attempts I am able to enter in BIOS setting (by pressing F12) option on booting screen found everything is okay. Here I noticed that I am facing problem in initial Hardware initializing process it indicates this is not virus problem it is pure some hardware issue. After so many attempts I entered in the main screen. I have attached external USB mouse because touchpad is not working. I have clicked on Start Icon and here I found the culprit for misbehaving.
It showing Continuous typing ‘P’ letter in search bar this may because of key itself stuck in press condition due to dust or some physical damage.
Therefore I removed the key cap for inspection but nothing seems damaged or dusty after cleaning with IPA I have refitted the key cap and tested again with no effect even I am unable to open any other application for testing…
So I have decided to disconnect the keyboard from the laptop and see.
I have removed the keyboard by releasing locks this keyboard does not having any screw you have to just press the lock and lift the keyboard gently because keyboard and other cabled attached beneath the keyboard.
After removing internal keyboard I have plugged external USB Keyboard for testing.
I have powered on the laptop and now laptop booted and directly showing desktop screen & search bar is also blank I have opened the word application for testing letter impact I found it works flawlessly without automatically repeated letters and touch pad is also working.
Now it is concluded internal keyboard itself is faulty and needs to be replaced with new. So I have discussed with the customer that there is no Virus Problem and this problem is of keyboard which always keep generating miss commands to processor hence it misbehaving. Customer is agreeing to get replace the keyboard.
After replacing new keyboard it works fine.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles in the link below:
https://jestineyong.com/rechargeable-battery-problem-in-mosquito-killer-racket/
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Gassan Ali
February 3, 2021 at 10:45 am
Nice work!
Yogesh Panchal
February 3, 2021 at 6:43 pm
Thank you! Sir
Albert van Bemmelen
February 3, 2021 at 2:00 pm
The P never got depressed, but the owner did ! (Lol). These things happen to heavy used worn out keyboard keys. The conductive foils in the thin layered keyboards are known for their cheaper construction, just like the old foil keyboards used in the famous old ZX Spectrum computers. And when those foil layers get wet inside, even by plain clean (tap-)water, they are known for causing unfixable problems to the keyboard.
Parasuraman S
February 3, 2021 at 6:53 pm
A good and informative article! Many thanks for the time spent in sharing your experiences, which are lessons to be learnt by us!
Yogesh Panchal
February 4, 2021 at 3:46 pm
Sir,
Thanks! for encouraging........
Yogesh Panchal
February 3, 2021 at 6:59 pm
Ha ha ha.........indeed customer has depressed me for this repair, he has argued with me by saying that he has shown this laptop to 2 technicians and as per their diagnosis they are sure about Virus Problem and you are trying to make more money by making me fool. finally on arrival of new keyboard i have shown him the fact practically.Good thing for me that he has referred me another two friends of him for their computer problem.
This keyboards are having very thin conductive foils with aluminum support because of aluminum if your keyboard get more pressure on the key aluminum under the key get bend and the conductive foils stops to respond on pressing the key .
Edgar
February 4, 2021 at 4:29 pm
Hi, what model of DELL is this laptop?
Yogesh Panchal
February 6, 2021 at 6:13 pm
Edgar,
This is Dell Inspiron 15 3000 Series Model P63F.
Lynn Blakely
February 5, 2021 at 7:13 am
Very good job and informative as to proper way to find the problem, then use a USB keyboard to see the computer work properly.
Yogesh Panchal
February 6, 2021 at 6:15 pm
Lynn Blakely,
Thanks!