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Laptop shutting down by itself

Laptop shuts off for no reason

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  • Julie Heinricy Jan 02, 2009

    Mine shuts off and somtimes it will even come up and then shut off. Sometimes the screen only shuts off. But the lights are still on.


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Your CPU chip may be overheating and/or your screen backlight may cut out as well. This is common of the VAIO PCG-F series Laptops.

Disconnect the power from your laptop and remove the battery.

To repair this issue, you must feel comfortable to solder SMD components and have such solder equipment as well as watch makers screw driver tool set. You will also need some copper shimming material, about 1-2mm thick and thermal grease/paste.
Eye piece Magnifier is useful as well.

Over time, the thermal contact material SONY used shrinks. It shrinks between the CPU chip and the Heat sink, effectively impeding the cooling efficiency of the fan/heat sink.

Clear indication for that is the Fan runs at full speed all the time.

Carefully open your laptop, (be sure you are ESD safe) and carefully remove the keyboard to get access to the CPU/heatsink.

Remove the heatsink and notice the white sponge material between the CPU and Heatsink is likely no longer making physical contact.

Fabricate copper shim to desired size and install the copper shims instead of the sponge, make use of the thermal grease on both sides.

Reinstall the heatsink.

To fix the LCD backlitght, carefully remove the 4 rubber thingys in the corners of the screen, and open the screen.

On the lower side there is a slim Board wrapped in some plastics.

Carefully remove this board, remove the plastic wrap and look at the soldering spots on the Ferrite Transformer. They may be cracked and need resoldering. Resolder as needed and reinstall the board.

If you do not feel comfortable to do this, then find someone who is.
Perferly a technician with experience in such fields.

Good luck

Posted on Jan 10, 2009

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