Question about Toshiba Satellite L355-S7902 Notebook

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I have an L355-S7902. It will not power up. I have replaced the power supply and checked internal plugs and wiring and everything is as it should be. No power, no boot - nothing.

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  • Mark Burnett Sep 29, 2010

    This unit has a cable that runs from the motherboard around 5 1/2 to 6 inches long to a hard-wired plug. This cable is plugged in firmly to the motherboard and connection looks and feels firm at the plug itself. No smell of burned wire in plug.

  • Mark Burnett Sep 29, 2010

    This unit has a cable around 5 1/2 to 6 inches that attaches to the motherboard, plug is hard-wired on other end. Connection is firm to motherboard and looks and feels good at plug end. No smell of burned wire from plug.

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  • Master
  • 561 Answers

Hi

Thank you for your query

Have you checked the DC jack which usually comes of the motherboard (it is soldered on).
This is a key problem when it comes to laptops

Regards
Shauqat

Posted on Sep 29, 2010

  • shauqat Sep 29, 2010

    Ok

    It may be that the motherboard has blown

    However please try the following

    1) Remove the battery and the power connector
    2) Press and hold the power button down for approx 30 seconds
    3) Plug in battery and connector and see if laptop powers up

    Failing this you are looking at motherboard failure

    Regards
    Shauqat

  • Mark Burnett Sep 29, 2010

    This did not work. Any ideas on where to pick up a replacement motherboard?

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L355-S7902 wont power on


The DC Power Jack is connected to wires that end in a plug. The entire affair is referred to as a DC Power Harness,

http://www.amazon.com/POWER-CABLE-TOSHIBA-SATELLITE-L355-S7902/dp/B005FD3M16

In the Clarification I stated earlier, the link I posted stated about the $3 DC Power Jack fix. It had another link,

http://www.insidemylaptop.com/repair-damaged-power-jack-toshiba-satellite-l305-l355-laptops/

Means to me that the old DC Power Jack, may have been removed from the DC Power Harness, and the $3 DC Power Jack soldered on.

1) Both red wires, (2 - Power), and black wires (2 - Ground) were used?
2) Are you sure the solder joints are good? Not cold solder joints?

3) The DC Power Harness cable is plugged in tightly to the motherboard?
4) Was a continuity test done with a multimeter, of the DC Power Harness itself after the new jack was installed?

Just to get the obvious out of the way;

5) AC adapter (Charger) was tested? Center hole is Positive, outside cylindrical metal shell is Negative. DC Voltage scale. Looking for 19 Volts (DC)

6) You FOLLOWED Anti-Static Precautions?
What method did you use?

AC adapter checks out, modified DC Power Harness checks out, the problem is in the power section on the motherboard.

Power MOSFET's determine if the Battery needs a trickle charge, full charge, or no charge at all.
Also determines if the laptop is to just run off of the Battery, or AC adapter.

Check the motherboard near the area the DC Power Harness plugs in, for burned, blackened, or blistered Power MOSFET's.
Using HP Pavilion dv6000 series, and Pavilion dv9000 series Notebook PC's, as an example,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Using a Fairchild Semiconductor International - FDS6679 - Power MOSFET as an example,

http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679

1 Dollar and 1 Penny

On the Mayohardware blog also look at the second photo down, with the Alpha and Omega Semiconductor - AO4407 - Power MOSFET, circled in Yellow.
Click on the photo.

Look to the right of the AO4407. The small rectangular shape to the right, with the dark wide band on it is a Ceramic Capacitor.
There is one above it, one above that one, and one to the right. Just some of the ceramic capacitors.

Need to pay close attention to the ones in the area immediately surrounding the Power MOSFET's, in the power section.
See if any are burned, blackened, or blistered.

Just one bad one will do it.

NOT the ceramic capacitors used, just examples,

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wqu1Z1z0t6f3

(Scroll down)

http://www.youtube.com/watch?v=5uiroWBkdFY

You don't need a Soldering Station. That type of beveled tip, and a low Wattage soldering iron.

(Plus desoldering braid, {Solder Wick}, .030 Rosin Core solder, Rosin flux, damp sponge, patience)

Or hot air and flux,

http://www.youtube.com/watch?v=IgrEbJN8dcQ&feature=related

Regards,
joecoolvette

[ ......game out of the cdrom that was jammed in upside down?
I would have removed the one Philips head screw from the bottom of the laptop, slid the optical drive ('cdrom') out, and removed the small screws from it's cover, then removed the disk.

Like your idea better ]

Oct 09, 2012 | Computers & Internet

1 Answer

My internet suddenly quit working


sounds like a virus either way a reinstall will sort it back up any documents and pics first

Feb 11, 2012 | Toshiba Satellite L355-S7902 Notebook

2 Answers

I no longer get any sound on my toshiba satellite l355-s7902. therefore i can't hear music, videos, alerts, etc. any advice? thanks.


Try installing the latest audio driver.
You can download any orall the Windows device drivers for your model laptop from the Toshiba WEB sitefrom their download page. Make sure you enter the model of your laptop so youcan get the correct drivers. Please click on this link: - http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp http://blitware.com/adpages/driverfetch/manufacturer/?manufacturer=Toshiba&gclid=CMOVxNCBx6ACFSgnawodoHNGbA

Apr 25, 2011 | Toshiba Satellite L355-S7902 Notebook

1 Answer

Disk drive will not open?


Grab a small paper clip and then press the little hole with the tip of your paper clip. This little hole is found near the eject button of your disc drive, press it in and it will pop open.

Feb 08, 2011 | Toshiba Satellite L355-S7902 Notebook

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