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I need the schematics for a toshiba satellite P855-S5200 motherboard

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  • Toshiba Master
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Request the schematic diagrams directly from Toshiba.

Posted on Aug 26, 2019


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  • 2 Answers


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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Need new / 2nd hand Toshiba satellite laptop motherboard

Hi, I am facing the same problem.
Can anyone please help with a motherboard for a Toshiba Satelite P20-771

Posted on May 27, 2008

  • 3 Answers

SOURCE: Good morning,i try to find

Here is:


Posted on Feb 13, 2011

  • 5660 Answers

SOURCE: i need schematic diagram for toshiba L6450 s4030 for power solution

The above example is just from a quick search on the internet.
You may wish to perform your own search.

(Psst,..L640D )

Schematic for the power circuit traces on the motherboard? Not available to the general public. Only authorized repair personnel.
(No,...not me either)

However, with all laptops;

1) Power comes from the AC adapter, or the Battery.

A) Make SURE the AC adapter (Charger) is putting out the correct Voltage, with a multimeter set to DC Voltage.

For the Satellite L640D-S4030 Notebook PC, the voltage is 19 Volts.

(Center hole is the Positive connection. The outside cylindrical metal shell is the Negative connection)

B) DC Power Jack
The DC Power Jack is the jack on the laptop that the AC adapter connects to. (May be marked on laptop as DC IN)

Battery removed, use a non-metallic instrument, and see if the center pin, or outside shell, will move.
ANY perceptible movement means a problem with the DC Power Jack.

The motherboard needs to be removed, and the jack physically checked out, for it's mounting on the motherboard.

May be a damaged DC Power Jack, (Replacement), or the jack's solder joints may be cracked on the motherboard. (Resolder the jack's solder joints)

DC Power Jack checks out the problem is the power correcting chipset.
(Or a burnt circuit trace, { Or traces }, on the motherboard )

Do Not know what power correcting chipset is used on this model.
However I can give you three examples of commonly used ones.

Perhaps this way, you can use these examples to find the power correcting chipset on your motherboard.

(Power correcting chipset determines if;
1) Power is needed for the Battery. Is a trickle charge needed, or a full charge.
2) Also determines if the laptop battery is fully charged, and the laptop is to run off of the AC adapter )




The power correcting chipset is a Power MOSFET,

Replacement is fairly simple with good to excellent soldering skills, since these particular MOSFET's use J leads. (Prongs on chipset that solder to the motherboard)

HOWEVER, make sure;

1) That you use an ESD wrist strap, and have it's alligator clip attached to a good ground source, when working on a laptop.
An ESD wrist strap cost averages around $3 to $6.

2) That you connect a Heatsink tool, to EACH J lead as you solder it to the motherboard. (There are transistor/s inside the Power MOSFET)

Example of a Heatsink tool,


Posted on Apr 01, 2012

  • 33 Answers

SOURCE: toshiba p850 operating manual

Follow this link:

download and wah lah

Posted on Jul 06, 2012

  • 32281 Answers

SOURCE: toshiba satellite c660 motherboard not power

When you connect the power adapter into the laptop, does the power LED light up? If not then - The battery adapter or the adapter's power lead or the laptop's power socket could be faulty. Check power adapter's DC plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard. This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.

Posted on Sep 05, 2012

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Toshiba p850 operating manual

Follow this link:

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