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The following parts list references the component designators found in the assembly diagram from the service manual. The list is grouped based on the numbering scheme, with a guess on the function of each group.
=== Main PCB ===
==== CPU/DSP ====
IC1001 Canon '''Digic III''', and Elpida HB0010A17E-E DDR mobile RAM + NOR flash memory (package on package)
IC1002, IC1003 JRC '''NJM2877''' LDO
* Marking 7 14 71, 5-pin package
IC1004 marking FA, 5-pin package, LDO?
IC1005 Seiko S-817 series LDO?
* Marking G8X, 4-pin package
IC1006 Seiko S-817 series LDO?
* Marking B9O, 4-pin package
IC1007 Seiko Epson '''RX-4571LC''' real time clock
* Marking E4571
SR1001 Landscape/portrait orientation sensor?
Q1003, Q1010, Q1011 Toshiba '''RN4982FE''' NPN PNP Transistors with 10K Bias Resistors
* Marking 6B, 6-pin package
Q1005, Q1007, Q1008 Toshiba '''RN1902FE''' Dual NPN Transistors with 10K Bias Resistors
* Marking XB, 6-pin package
Q1012 Toshiba '''RN4984FE''' NPN PNP Transistors with 47K Bias Resistors
* Marking 6D, 6-pin package
D1001 Panasonic '''MA2S111''' Switching Diode
* Marking A, 2-pin package (silver)
D1002 Panasonic '''MA3S132E''' Dual Switching diodes
* Marking MU, 3-pin package
CN1001 flat flex to DC/DC PCB
CN1003 unpopulated/undocumented -> JTAG/Serial?
* Located near to SD card holder* Multiple pads connected to test points
CN1004 USB/digital
SW1001 switch, battery cover open detect
==== CCD Interface ====
IC2002, IC2003 JRC '''NJM2877''' LDO
* 5-bin package
IC2004 marking 11 77 41, 6-pin package
IC2008 JRC '''NJM2877''' LDO
* 5-pin package
IC2009 not populated
* 5-pin package
CN2001 connector for image sensor assembly
==== Lens Motor Driver ====
IC3001 Toshiba '''TB6609FL''' motor driver?
CN3001 flat flex to lens assembly (zoom, focus, aperture, etc.)
==== Image Stabilization ====
IC3201 Renesas(?) '''R2J30504''' 725104
* CK4-1105: Canon part number?* Similar IC with part number R2J3050x was found in Sony W120, Canon PowerShot A3100 IS
SR3201, SR3202 Murata '''ENC-03''' series, angular rate sensors
* 1x ENC-03RC-R and 1x ENC-03RD-R
==== LCD Driver ====
IC4001 '''15019GB''' 7CR0G 070 LCD power? Driver?
CN4002 LCD backlight
==== Audio/Video ====
IC4501 Wolfson '''WM1400G''' Audio driver/Codec
IC4502 JRC '''NJM2571''' Low Voltage Video Amplifier with LPF
* Marking A51, 6-pin package
IC4503 unpopulated
CN4502 A/V out
==== Mystery ====
[[File:Canon PowerShot G9 IC502.jpg|thumb|Low resolution die image of mystery IC502]]
The function of this section, and its main chip IC502 is unclear.
IC501 JRC '''NJM2877''' LDO
* marking 7 12 62, 5-pin package
IC502 the Mystery IC
* Transparent package
* The big black area of this IC looks like a light sensor. However, in the assembled camera, the chip is facing inwards towards the battery compartment.
Q501 SOT23-6 marking FM
ZD501 marking R, reverse biased
=== DC/DC Power PCB ===
IC601 FE '''7761R''' multi-output DC-DC power management controller
IC691 Seiko S-817 series LDO?
* Marking CUW, 4-pin package
BAT691 Seiko Instruments MS614S 3V rechargeable Li-Ion battery
CN651 flat flex to main PCB
=== Top_M Top Camera Control FPC ===
==== Button controls ====
CN251 to TOP_I FPC
D251, D252, 254, D255 Panasonic '''MA4Z159''' Dual Switching Diodes
* Marking M1B, 4-pin package
D253 Panasonic '''MA3S132E''' Dual Switching diodes
* Also 4x on rotary dial FPC* Marking MU, 3-pin package (silver)
D? Panasonic '''MA2S111''' Switching Diode
* 1x rotary dial FPC* Marking A, 2-pin package (silver)
==== Power ? Flash?====
Q581 Toshiba '''RN4984FE''' NPN PNP Transistors with 47K Bias Resistors
* Marking 6D, 6-pin package
Q582 ROHM '''2SK2715''' 10V drive N-Ch MOSFET
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