NEC NP215 DLP Projector Teardown
I’ve been playing with an old, faulty NEC Projector. It uses a DDP2230 DLP controller, for which no datasheet is available. It took a bit of fiddling to get everything working out of the case and the mercury lamp burnt a nice mark in my desk… I did manage to get some video of the DMD (1076-6039b IIRC) working:
I also a traced out the header (see below), the +/- ~20v signals appear to match the mirror bias/reset signals, but I wasn’t able to see anything on what looked like differential pairs going into the DMD. And without the datasheet I’m not quite sure what the signals should look like.
There is 9 page datasheet for the DMD device itself though the part number doesn’t match completely. In typical vendor style they’ve also masked out all the pinout information (available under NDA I’d guess). A few screen grabs below…
Pin 7 etc. Mirror reset/bias
Example of what I assume is LVDS trace:
Length matched differential traces?:
Tracing out the header:
1: 3.2v
2:
3: 3.2V
4:
5: 0V
6:
7: +20 TO -20 300NS FIRST NEG THEN GND THEN POS. BASELINE IN +20v
8:
9: as 7
10: as 7
11: as 7
12: 7
13: as 7
14: as 7
15: as 7
16: 7
17: as 7
18: 7
19: as 7
20:7
21: as 7
22:7
23: 0
24: 0
25: 0
26: 3
27: 2.3v
29: 0
30: 0
31: 0
32: 0
33: 0
34: 0
35: 800mv
36:
37: 1.2
38: 1.2
39: 800
40: 800
41: 1,2
42: 1.2
43: 0
44: 0
45: 800
46:1
47: 1.2
48: 1
49: 800
50: 800
51: 800
52:
53: 1.2
54: 0
55: 800
56: 800
57: 1.2
58: 0
59: 800
60: 1.3
61: 1.2
62: 800
63: 0
64: 1.3
65: 1.2
66:0
67: 800
68:1
69: 1.2
70:1
71: 800
72:1
73: 1.2
74:800
75: 800
76:1.3
77: 1.2
78: 1.3
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