When one asks for a diagram of a motherboard, one is asking;
1) What type of Ram Memory slots, and how many,
2) What the internal connectors on the motherboard are,
3) What the motherboard chipset is,
4) What Processor (CPU) socket is used,
5) Plus a host of other questions.
6) What time will Mom have supper ready?
NO,.........not that last one. Just wanted to see if you were following along.........
Let's do it this way. How about the Service Manual?http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02030223/c02030223.pdf
Plus view images of the motherboard,http://www.ebay.com/itm/HP-6735b-Main-pcb-no-post-488194-001-with-prosessor-ZM-80-AMD-Turion-X2-/170999202777?pt=LH_DefaultDomain_2&hash=item27d058c3d9
The main view shown, automatically opens to a Bottom view of the motherboard.
Put your mouse cursor in the middle of the photo, and use the Zoom In feature.
See the white Processor socket? Rectangle shape with 2 corners cut off, and a flat tip screw in it. Has an AMD Turion X2 Ultra processor sitting in it.
That is a Socket S1 processor socket,http://en.wikipedia.org/wiki/Socket_S1
The graphics chipset is to the Left. Mounted to the motherboard with a BGA surface mount. Ball Grid Array,http://en.wikipedia.org/wiki/Ball_grid_array
In the next link scroll down a little, click on the Red ->
Take a few minutes to view the IR 650 demo video;
to see an SMT/BGA Rework Station at work, and learn more about the BGA surface mount,http://ersa.com/art-ir-pl-650-346-1472.html
The motherboard chipset is an AMD 780G that is for a laptop.
So it is an AMD M780G,http://en.wikipedia.org/wiki/Comparison_of_AMD_Chipsets#A-Link_Express_II
Scroll down to AMD 780G chipset.http://h10010.www1.hp.com/wwpc/us/en/en/WF06a/321957-321957-64295-321838-3955547-3687645.html?dnr=1
Northbridge chip, of the motherboard chipset; is the AMD M780G.
The Southbridge chip is an AMD SB700, or SB710, or SB750,http://en.wikipedia.org/wiki/Comparison_of_AMD_Chipsets#A-Link_Express
This motherboard diagram, works for the HP 488194-001 motherboard,http://en.wikipedia.org/wiki/File:Motherboard_diagram.svg
The HP Support link above states what;
A) Processors are supported
B) Ram Memory that is supported. What the TOTAL maximum amount for the motherboard is, and what the Maximum Amount is for Each ram memory slot.
C) No. It does not use a graphics card. The graphics are Integrated Graphics.
In conclusion; What are the specific question/s you have?
Post back in a Comment.