I'm not going to play a guessing game
A) Is the person who disassembled the laptop nearby? The last person to do so?
That is the person I need to converse with, or have you go in-between.
Forgive me, but I do not believe it was you.
A technically minded person IMHO, would have the decency to state what the manufacturer and model number of the laptop is.
[Of course I could be full of it, as Einstein was often noted for forgetting to put his pants on, lol! ]
1) I need to know if this person knows what Anti-Static Procedures are, and if so what method was used?
A person may have taken the laptop apart several times, and got LUCKY; but Zapped it on the last one.
2) Need to know if the person understands what each cable from the motherboard does, therefore understanding why each cable needs to be hooked up, and what will happen if one is not.
3) Need to know WHY laptop was repeatedly disassembled, if cleaning was not the issue.
4) Need to know if Thermal Paste, and Thermal Pad was replaced each time; if the Cooling Tube/Heatsink was removed.
5) The jack on the laptop that the AC adapter ('Charger'), plugs into; is the DC Power Jack. (DC_IN)
Has this been replaced?
Is the AC adapter putting out the correct voltage? Checked? Battery fully charged?
AC adapter working fine, DC Power Jack checks out OK, suggest problem is Power MOSFET's in the DC - DC circuit on the motherboard.
An example using the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's, (This problem is not just inherent to these laptop series, nor manufacturer),http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html
B) What is the computer manufacturer name, and model number?
Might be in a Service Bulletin as having an inherent issue, or might be known through the internet community; as having a specific, or inherent issue.
Take the HP Pavilion dv2000, Pavilion dv6000, and Pavilion dv9000 series of Notebook PC's for an example......
Inadequate cooling for the graphics chipset.
Nvidia was blamed for the graphics chipsets, but the fault was known (And proved), to be inadequate cooling from the HP design engineers. (And NOT the graphics chipsets)
There are some Compaq models also.
[The graphics chipset is mounted to the motherboard with a BGA surface mount. Ball Grid Array.
Solder Balls on graphics chipset, to gold plated Copper Pads on the motherboard; in a ball grid array.
With the graphics chipset overheating, the solder connections made, also known as Solder Joints; begin to soften.
Then with the laptop turned off, the solder joints re-harden.
This causes Cold Solder Joints, which makes a poor contact of graphics chipset to motherboard.
Laptop MAY turn on, and show no graphics.
Laptop MAY NOT turn on.http://ersa.com/art-ir-pl-650-346-1472.html
Scroll down, click on the Red -
Take a few minutes to view the IR 650 demo video ]
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