Pin assignments of LC575 logic board v.s. analog board

Number Logic board Analog board

1

-12V

-12V
2 GND GND
3 +5V +5V
4 GND GND
5 +5V cont. +5V cont.
6 GND GND
7 /PFW /PFW
8 GND GND
9 Composite/Horizontal sync. Composite sync.
10 GND GND
11 Video (B) Video (B)
12 GND GND
13 Video (G) Video (G)
14 GND GND
15 Video (R) Video (R)
16 GND GND
17 Brightness Brightness
18 GND GND
19 Contrast Contrast
20 Monitor ID 2 Monitor ID 2
21 Mic (+) Mic (+)
22 Mic (-) Mic (-)
23 +5V Mic(+5V)
24 Monitor ID 1 Monitor ID 1
25 Monitor ID 0 Monitor ID 0
26 GND GND
27 n.c. n.c.
28 Sound out (R+) Sound out (R+)
29 Sound out (R-) --> FG Sound out (R-)
30 Sound out (L+) Sound out (L+)
31 Sound out (L-) --> FG Sound out (L-)
32 GND GND
33 Vertical sync. n.c.
34 n.c. n.c.
35 n.c. n.c.
36 GND GND
37 Sound muting control Sound muting control
38 GND GND
39 Monitor blinking control Monitor blinking control
40 GND GND
41 n.c.
42 n.c.
43 n.c.
44 CD-ROM sound (R+)
45 GND
46 CD-ROM sound (R-)
47 GND
48 CD-ROM sound (L+)
49 GND
50 CD-ROM sound (L-)