An awesome student from our education program made this wiki. It is not managed by iFixit staff.
Toshiba Satellite P855-S5102 Troubleshooting
Identified by model number P855-S5102. The device uses intel core i5 with a 8gb RAM and 750 gb hard drive.
- Device overheats and begins making weird noises
- Keyboard Starts Jamming
- Laptop Turns On and Off By Itself
- Cursor Does Not Work
- Computer Will Not Turn On
- Screen does not display properly
- PC Freezes or Reboots
- Computer Powers on but Does not Perform Power-On Self Test, Or Powers Off Immediately
- Computer Will Not Read CD/DVD’s
Laptop gets hot and begins to make a very disruptive noise
First user should check to see if device’s fan may be dusty or not working effectively. If dusty, use compressed air to clean the fan to re-establish its function. Otherwise fan may need replacing.
Keys on the keyboard occasional become jammed and do not work effectively
First, turn off laptop then use compressed air to blow around the keys so that any debris stuck between the keys is removed. Afterward use cotton swabs and alcohol to clean in between and around the keyboard to remove stickiness. If that does not work remove key(s) from the keyboard. Use a small brush to remove dirt and debris that may be obstructing the key and sensor. You may use cotton swabs and alcohol to remove stickiness. Once the alcohol has dried, put the key(s) back in place. If keys are still jamming, then the keyboard or some of its keys may need to be replaced.
Computer turns on, then off again, without the power-on button being pressed.
The price of a new motherboard is usually higher than just buying a new laptop. However, there are a few things you can try before purchasing a new motherboard.
Test laptop with another power adapter. Adapters can sometimes fail or may not be supplying enough voltage needed to keep the laptop on.
You can also try resetting the RAM and removing the hard drive. With just the power adaptor plugged in with the battery and the hard drive removed, try powering up the laptop. If the screen does not come on then a new motherboard will be needed.
The cursor does not appear on the screen or does not function properly
First go to your Windows Control Panel of your laptop and check the sensitivity of the touchpad. Check to see if the the touchpad is too sensitive or if its not sensitive enough. If that is not the problem then go to the “Device Settings” and check your Mouse Pad Settings to see if everything is alright. If that is also not the issue then consider replacing the Mouse Pad.
The computer does not give any sign of starting up.
Ensure the charging adapter is placed correctly into the charging port and that the adapter is fully plugged into a wall outlet. If all is done correctly and the light indicating that the computer is charging is not on, then the charging adapter is malfunctioning. Consider replacing the charging adapter.
Ensure the battery is correctly fixed into the battery pocket, then plug the charging adapter into the computer and a wall outlet and fully charge the computer. Once the computer is charged, disconnect the charging adapter and attempt to power on the computer. If the computer does not turn on, plug the charging adapter back into the computer and a power source (eg. a wall outlet), then attempt to power on the computer once more. If the computer does boot up while plugged in, the battery is faulty. Consider replacing the battery.
If the problem is not caused by the battery or the charging adapter, a faulty hard drive may be the reason. Consider replacing the hard drive.
Vertical lines or dead pixels on the screen
Connect the laptop to an external monitor. If the external monitor is displaying properly, screen issues may be due to faulty display assembly. Consider replacing the display assembly.
If there are display issues on the external monitor, display issues may be caused by faulty graphics card. Consider replacing the graphics card.
Laptop screens stops functioning and starts over randomly.
First turn off your laptop and open the casing of it. Once you are inside of the casing, remove the RAM card from its slot, and from there you can switch the RAM cards into different unoccupied spots. If the computer is still freezing, use a third party software that could scan your laptop for RAM issues. After the scanning is done the software should give you a good idea if the RAM on your PC is working sufficiently. If the RAM is working sufficiently and the computer is still freezing, then consider replacing the RAM cards.
The computer shows signs of starting up but the screen does not light up and the computer does not beep, or immediately powers down without reason.
Check for dust in the fan, and if the fan is running smoothly, as this could cause the computer to heat up above normal operating temperatures. If not, clean the fan or consider replacing the fan.
If the fan is running smoothly and is clear of dust, check the capacitors on the motherboard. Faulty capacitors, including bulging or leaking capacitors, will cause system errors. If bulging or leaking capacitors are found, consider replacing the hardware where the faulty capacitor is located.
The most common cause for the computer not performing a power-on self test, or shutting down completely is a faulty CPU. If the capacitors check out, check your battery and your charging adapter. If the power supply is working properly, then the issue is your CPU. Consider replacing your CPU.
The computer will let you insert CD/DVD’s but it will not show up on the computer screen or in the computer’s folders. The computer will not recognize the CD/DVD drive at all.
If the computer allows you to insert CD/DVD into the optical drive, but it does not show up in the computer, then the optical drive is not reading the CD/DVD correctly, and there is an issue with the optical drive. If the computer does not recognize the CD/DVD drive at all, then there is an issue with the optical drive. Consider replacing the optical drive.