3M
Multimedia Projector MP8670/8745/8755/8770
Troubleshooting
Copyright
2000, 3M IPC. All Rights Reserved.
3-7
3-6.
No Picture – RGB or VIDEO
No Picture -
RGB or VIDEO
Is
Voltage Input
at Pins 4, 6, 8, 10,
12, 14 of EDS1 on the
Main PWB?
No
Power Unit
(Circuit)
Signal
PWB
Yes
Are
Signals Input at
the Pins (below) of EDI1
on the
Main PWB?
Yes
36, 45, 46 : (CHK066) : R signal
33, 34, 38 : (CHK065) : G signal
31, 50, 51 : (CHK064) : B signal
64 : (CHK075) : H sync
63 : (CHK074) : V sync
15, 66 : (CHK055) : CLK
Are
Signals Input at the
Pins (below) of EMD1
on the
Main PWB?
No
Main PWB
Yes
Drive
PWB
No
PWB Input
Terminal RGB
PWB
Signal
4 : (CHK0041) : +6.6V
6 : (CHK0043) : +17.0V
8 : (CHK0044) : +5V
10 : (CHK0038) : +5V
12 : (CHK0039) : +5V
14 :(CHK0040) : +5V
10, 11 : (CHK0031) : R signal
6, 7 : (CHK0035) : G signal
2, 3 : (CHK0037) : B signal
39 : (CHK010) : H sync
38 : (CHK011) : V sync
49 : (CHK002) : VIDEO. R signal
47 : (CHK004) : VIDEO. G signal
45 : (CHK006) : VIDEO. B signal
36 : (CHK012) : VIDEO. H sync
35 : (CHK013) : VIDEO. V sync
Check at operating mode with RGB1 or 2 input
1
1 - Signal PWB generates separate 5V reg for Main PWB and RGB PWB
LCD Module
Assembly
