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No Display/Beeps - TOSHIBA Satellite M115-S1061

I have a TOSHIBA Satellite M115-S1061 - Model No. PSMB6U-00G005 (a laptop in case someone asks) that I picked from a client of mine this morning 9-10-09. The problem with the laptop started when the client accidently stepped on his keyboard (as the laptop was in the open position; with the lid open). He described to me a ''white'' display after this incident which occured many months ago.

As of today, I turned on the laptop and I get absolutely no display (or backlight) and no beeps. I've completely tore down the laptop and checked all cables on the motherboard and the back of the LCD screen. I can not reproduce the ''white'' screen symptom that was discribed to me and when I hook up an external monitor, I can not switch to the external monitor because the keyboard doesn't work properly anymore.

I've checked for cracks all over both sides of the motherboard and I've pressed with enough pressure to hear any cracks that may have been present, but nothing was found. It seems as though only the keyboard was ruined when he stepped on the laptop, as the laptop was open when he stepped on it.

Short of trying a new keyboard and LCD screen and/or motherboard, any other suggestions before I take those steps?

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  • e_z_minded_g Sep 10, 2009

    I have already tried all of the above unsuccessfully, unfortunately. I did suspect that it could possibly be the inverter and it all appeared to be ok, no loose solder joints for me to fix. I examined the cables pretty well to make sure that there weren't any wires that had come out of the end joint and as far as I could tell, they were all in working order.

    I'd gladly run down and pick up the keyboard if it were at Best Buy or Fry's Electronics or some other store here locally but from calling around, noone has the part in stock (which I assumed would be the case).

  • e_z_minded_g Sep 21, 2009

    I ordered the new keyboard about a week ago, I'm still waiting for it to come in but when it does, I will try switching over to the external monitor.

    I did resolder some joints that were around the area by just adding a little extra solder to make sure every connection was secure. I still was unable to find any cracks with a magnifying glass but I wont really know more until the keyboard gets in hopefully this week sometime.



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There's nothing much you can do at this stage apart from get another keyboard with a function key and try to switch screens, other than that you could check the inverter board & connections there.

Remove the screen bezel, At the bottom of the screen you will see an elongated piece of circuit board with wires coming from either end covered by frosted plastic.
That is the inverter, check the connections on the inverter (both sides) and power the laptop up to check the display, to remove it gently pull the plugs from each end and remove the screw from the middle and pull the board away.
Look on the back of the inverter itself for a copper coil, if you re-solder the solder points around the coil you may find it works again as components that suffer from extreme heat the solder joints dry causing bad connections, re-floating the solder solves the problem in 90% of cases.

Good luck.

Posted on Sep 10, 2009

  • Lee Hodgson
    Lee Hodgson Sep 10, 2009

    Also check the cable that leads from the motherboard to the inverter, inspect the lead closely at each end to check that any wires have not come away or worked loose as the pressure from the laptop being stood on can stretch the wires.
    The cable could well be the problem.

  • Lee Hodgson
    Lee Hodgson Sep 14, 2009

    Your not necessarily going to be able to see any dropped joints with the naked eye as these can be hairline cracks, try re-soldering the solder points around the coil and see if that works.




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