Following components soldered on the top side of the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling.

ICH (I/O Controller Hub)

CPU Video chip

MCH (Memory Controller Hub)

UMA:

b

d

a

VGA:

b

c

d

a

98ThinkPad SL300 Hardware Maintenance Manual

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Lenovo SL300 manual Uma