Hardware laptop stopped working

Magnu420

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guys the missis laptop has stopped working. ive tried all the usual steps powering it on without the ram. the hdd. without battery just power lead. holding the power button but nothing. the laptop does show power light working and you can hear the fan they is no post beeps or the logo where you can boot into bios
could it be the cpu thats fried or mobo. is they a way to test the cpu or is it specificly to tied to the mobo

laptop is toshiba satellite L450-11v
has anyone got any spares ie cpu or mobo or both

Sent from 2 tin cans and some string
 
If the power button lights up and the fan spins then it's probably booting up OK and it's your screen that's knackered, can you try an external monitor?
 
Have you tried


  1. [*=left]Turn off the computer,
    [*=left]Take the battery out
    [*=left]Take out the power supply
    [*=left]Push the power button down for 30 seconds.
    [*=left]Reconnect power supply leave battery off
    [*=left]Attempt to boot
    [*=left]If ok refit battery
Something else to try if you think its booting but nothing on screen is to cycle through the buttons which change from screen to external monitor (Fn (F5? blue square)
Finally attach latop to external monitor or TV to check if screen failure.
 
ive tried all them earlier and tried connecting to tv via hdmi and nothing
the hdd light not lit also the wifi dont light up
tried booting it without ram and hdd,it dont flash up toshiba logo and giving you
the option to boot into bios,in fact it dont beep before it starts booting
the missis said it has shut down a couple times prior to this and it was hot
underneath
 
Sounds like the charger has failed to me, this has happened on a friends acer laptop, it would come on work for a while, and then shut down,then stop working, using a powersupply off one of my acer laptops it works fine.

Have you tried another?
Maybe it can power the board but when extra parts require power it fails.
 
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If you still have the failed laptop, I can think of two things to try.
It is likely to be one of two things, either graphics chip / Chipset failure, or failed switching circuit on power up sequence.

1) Failed chip onboard;
Dismantle laptop and take out motherboard. Strip everything off it you can (inc. CPU, memory modules etc).
Wrap the motherboard up in tinfoil ensuring to cover everthing especially plastic areas. Cut around the suspect chip (graphics and or chip set controller) and remove tinfoil over chip, so that only that chip is exposed. Create 4 tin foil balls and get a baking tray. place balls on tray and place wrapped up motherboard on top of balls. This aids airflow.
Put in oven and turn on and let it heat slowly fan unassisted at 180deg. Once at 180 cook board for about 8-10 minutes then turn off oven, take out board and let it cool down still in tin foil. This will re-flow the failed chip. Once cooled, re-assemble everything and test.
If it works, backup everything you need off it, and sell it quick. It will likely last for 3-6 months before failing again. If you can afford the cost, you could take it to a specialist and get the suspect chip reballed and reflowed instead but this is usually an expensive option.

2) Failed power circuit.
This is a little more difficult, but if you are good with electronics and a soldering iron, trace from the power in socket all the mosfets in circuit and test each one (look up its specification online) - its likely you will find one thats failed. Buy and replace failed one. Typical symptoms of a failed mosfet are things like power light shows and charges battery, but pressing power on, power light flicks for an instant, then machine shuts off, or power adapter wont charge battery, but battery can be charged in another machine no problem, and that battery will power up your machine fine, or laptop will power up on mains, but wont charge battery, yet battery charges ok in another machine.

Jason.
 
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