Help with black screen on Toshiba Satellite L755

June 5, 2016 at 13:23:02
Specs: Windows 7
Toshiba Satellite L755 screen went Black when using pc, tried to restart, no fan sounds or any sounds, Amber light comes on when you try to power up, then goes off. Please help, thanks.

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#1
June 5, 2016 at 13:50:46
A hardware failure of some sort. Could be power adapter - is it the same if run without the main battery?

Always pop back and let us know the outcome - thanks


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#2
June 6, 2016 at 04:49:42
Yes, first try the power cord with the main battery removed. If it works then it is a short in the battery. If it does not work, let it rest overnight and try it just with the battery, if it begins to start, even if it dies before completely starting, it is the power cord that is bad and the battery is just dead flat on charge. See if someone you know has another Toshiba machine that you can borrow the cord to see if your battery takes a charge. This will prove that this is right so you can just shop for a new cord (or new battery). If neither works and another cord does not work either (with or without battery), then it gets more complicated and you may need service.

You have to be a little bit crazy to keep you from going insane.

message edited by Fingers


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#3
June 6, 2016 at 18:33:51
Are you sure your battery is charged?

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#4
June 7, 2016 at 06:41:33
Lack of battery charge is a possible reason but only if it is being used without the power cord. However, a faulty battery can cause problems even when on domestic power..

Always pop back and let us know the outcome - thanks


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#5
June 7, 2016 at 19:06:26
"a faulty battery can cause problems even when on domestic power.."
I have an extremly faulty battery on my Lenovo G410 that turns off immediately when power supply is cut off, even on full charge.
As I've experienced it, I have to disagree to that.
But yes, I might be wrong, there may be differences with varying brands, and I don't exactly know about Toshiba.
Any comments on this?

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#6
June 7, 2016 at 20:03:20
Jay: If the battery dies in the form of a dead short then it can prevent the laptop from booting up with the power cord, hence the suggestion to remove the battery and try the power cord without the battery installed as a test.
There are other possibilities including that the charging circuit in the laptop is fried so it is not charging the battery and may also not allow enough current through to allow the machine to work which is why it was suggested to try a different power cord.
Another reason to try the power cord is to be sure that the laptop itself (outside of the power handling circuit) can work and maybe it is bad or just maybe just the power cord is shot.

You have to be a little bit crazy to keep you from going insane.


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#7
June 7, 2016 at 22:00:05
"There are other possibilities including that the charging circuit in the laptop is fried so it is not charging the battery and may also not allow enough current through to allow the machine to work whichis why it was suggested to try a different power cord."
That's a bull's eye. :)
But again, why ain't the OP replying?

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#8
June 8, 2016 at 05:50:58
Re #5
We'll agree to disagree on that. A shorting battery can cause trouble. This does not necessarily fry the charger at the same time as they often have short circuit protection on the output. A shorting battery is what I had in mind not one which was open circuit or had a high internal impedance.

One experience does not necessarily mean that other experiences are incorrect and it would be a little naive to think so. Nothing can ever be proved using negatives. There are all sorts of different possibilities.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#9
June 9, 2016 at 01:24:17
That's why, I also added that I might be wrong! :)

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