CPU Upgrade on HP Pavilion dv7-6051er

[Vladimir_Chist]

Hi.

I have an HP Pavilion dv7-6051er laptop.(with Intel i3 processor)

And I have an Intel i7-2760qm processor.
In the manual http://h10032.www1.hp.com/ctg/Manual/c03043778.pdf
I found i7-2760qm in the list of supported, and even i7-2860qm.
According to the model number, the laptop was equipped with an Intel i3 processor.
90W power adapter.
No changes were made to the BIOS.
After replacing the processor with an i7-2760qm, the laptop behaves as follows when the power is turned on:
- power indicator near the power connector - on
- the indicator near the power button - lights up and after 1-2 seconds goes out, at the same time, the cooling fan starts up and stops
- laptop screen black

Questions:
1) If the processor model is listed in the manual (link above), when the processor is replaced, is the BIOS need to be flashed or not? (If yes, which version, and could you give a link to the manual and the corresponding BIOS)
2) TPD i7-2760qm is 45 W, this is 10 W more than the 35 W i3, can the lack of power be the reason for not starting the system?
3) What power adapters did the dv7 have with i7 processors for correct working?
4) If dv7 models with i7 processors were equipped with 90W power adapters and did not require BIOS adjustments, in which direction would you advise me to look for a solution to the problem?

Sincerely, Vladimir

[Huffer · Accepted solution]

Look at the list of motherboards on p. 25 of the Manual. The dual core i3 model was installed on a different motherboard than any of the quad core models. In other words, upgrading to a quad would require replacing both the motherboard and the processor. 

[Vladimir_Chist]

Thanks for the answer.
Didn't really read the manual carefully. And yes, it can be considered the answer to the problem.

But I will dive deeper into the solution, because the chipset is produced by Intel, which is common for the entire family. The buses of address, data, control are standardized. It is not very profitable for a manufacturer to produce a wide variety of motherboards. And the experience of sensible repair services shows that differences in motherboards are formed by configuration resistors(It is also possible that there are differences in the power circuits, but the difference in the TPD of processors is 10 W and because of this, to put more powerful MOSFET transistors and VRM, which means more expensive in cost). The HP Pavilion dv7 is a discontinued model, but I like it. Can technical support help me and send a schematic, circuit diagrams of the device?

[Huffer]

No HP does not publicize schematics, etc. I will say I believe the Quad Cores have a single pin which somehow is mapped differently than dual cores and the motherboard has to be designed to work with that pin correctly or it will not accept quads. I think the reverse is also true that you cannot put a dual core on the quad core motherboards. And it is not at all uncommon to have had separate quad and dual core motherboards: Dell and Lenovo work the same way. Laptop makers have now completely stopped designing motherboards with processor sockets in favor of a soldered on design. 

[Vladimir_Chist]

Thanks for the explanation. HP has really good tech support and community.