iMac ATX

par Lionel - 04/11/2004

Build a working computer from a bare logic board

Finalisation.

The remaining components will be placed in the box. Here's what the finished product looks like. I fixed the "drawer" with a screw.

Annex

What you'll need, where you'll find it:

iMac DV logic board
ATXPSU
Enclosure
Aluminum sheets 15/10
24 pins MicroFit female plug + pins
Female VGA plug (SubD 15 HD)
Female HE10 plug, 20 pins
Female HE10 plug, 40 pins
Female HE10 plug, 50 pins
4 pins female connector (see picture)
1m flat cable 50 pins
1m flat cable 20 pins
4m of electric cable, in red and black
Thermoretractable sleeve, 0.5mm and 2cm
Small heatsink + CPU fan
Thermal grease
5 LEDs
5 120ohms resistors
1 CD4069 (6x CMOS inverter)
M3 screws and bolts of different length
Metal and nylon spacers

Resistors and chips, spacers : Espace Composants Electronique, 66 Rue de Montreuil, 75011 Paris

Aluminum sheets : Weber métaux, 66 Rue de Turennes, 75004 Paris

Box, screws and bolts: any good "home depot"

MicroFit plug: http://www.mouser.com

Connectors:
538-43025-2400 1.040$
24 CKT RECEPTACLE
Molex Micro-Fit 3.0 Connectors

Pins:
538-43030-0001 0.090$
3.0 TERMINAL REEL
Molex Micro-Fit 3.0 Connectors

Pin maps:

All Connectors have a locating pin on the left. The female connectors are mapped from above (wires towards you).

Nota Bene : NC = Not connected, GND = Ground.

20 pins HE10 connector
SDA	1	2	SDC
GND	3	4	?
DCO	5	6	T5V
?	7	8	-10V
H-Sync	9	10	PFW
V-Sync	11	12	?
Blue	13	14	B-GND
Green	15	16	G-GND
Red	17	18	R-GND
L/S	19	20	?

26 pins HE10 connector
Micro (White)	1	2	Micro (Black)
Micro (Red)	3	4	Headphones
Headphones	5	6	Headphones
Headphones	7	8	Headphones
Headphones	9	10	Headphones
Headphones	11	12	NC
Speaker L	13	14	Speaker L
Speaker R	15	16	Speaker R
Power switch	17	18	GND
Power LED	19	20	Sleep LED
NC	21	22	NC
24VAC Phase 1	23	24	24VAC Phase 2
24VAC Phase 1	25	26	24VAC Phase 2

The headphones are the 2 face jack connectors on the face of the iMac DV. I do not have the wiring diagram for those

4 pins connector
	1	Power
	2	Reset
	3	NMI
	4	GND

24 pins Microfit Connector
+12V (CPU)	2	1	+3.3V (CPU)
+5V	4	3	GND
+5V	6	5	GND
GND	8	7	PT
GND	10	9	DCO
+3.3V	12	11	GND
+3.3V	14	13	GND
+3.3V	16	15	24VAC Phase1
+3,3V	18	17	24VAC Phase1
+12V (Sound)	20	19	24VAC Phase2
GND (Sound)	22	21	24VAC Phase2
+5V (Sound)	24	23	+15V (FireWire)

20 pins ATX Connector
+3.3V	11	1	+3.3V
-12V	12	2	+3,3V
GND	13	3	GND
PFW	14	4	+5V
GND	15	5	GND
GND	16	6	+5V
GND	17	7	GND
-5V	18	8	+3.3V PG
+5V	19	9	+5V SB
+5V	20	10	+12V

VGA Connector (SubD HD 15 pins)

5 GND	4 NC	3 BLUE	2 GREEN	1 RED
	10 GND	9 NC	8 B-GND	7 G-GND	6 R-GND
15 SDC	14 V-Sync	13 H-Sync	12 SDA	11 NC

50 pins HE10 Connector
GND	1	2	Audio-R
GND	3	4	Audio-L
NC	5	6	+5V
+5V	7	8	+5V
+5V	9	10	+5V
/Reset	11	12	GND
DD7	13	14	DD8
DD6	15	16	DD9
DD5	17	18	DD10
DD4	19	20	DD11
DD3	21	22	DD12
DD2	23	24	DD13
DD1	25	26	DD14
DD0	27	28	DD15
GND	29	30	KEY-NC
DMARQ	31	32	GND
/DIOW	33	34	GND
/DIOR	35	36	GND
IORDY	37	38	CSEL
/DMARCK	39	40	GND
INTRQ	41	42	/IOCS16
DA1	43	44	/PDIAG
DA0	45	46	DA2
/CS0	47	48	/CS1
/DASP	49	50	GND

PDF documents:

Antoine Bercovici
(Kiryu)
aberco@free.fr