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Output Waveforms
Conditions for the color wheel output waveforms of figure 15:
1. These three waveforms appear right after the color wheel rotates (channel 1) and
the TV powers on (channels 2 & 3).
2. The amplitude of the channel 1 Color Wheel signal (180 Hz) is 5Vp-p, but the
data and clock signal output (channels 2 & 3) are at 3Vp-p only.
Rotation pulses
Color Wheel Output Waveforms into Microprocessor
Waveform
Channel 1
Color Wheel rotation pulses 5 Vp-p
2
Channel 2
I
C serial data
2
Channel 3
I
C serial clock
Time base = 10ms/div.
Color Wheel Adjustment
If the color wheel assembly is replaced because of picture noise, picture solarization
(see Video Signal Flow), or TV shutdown, the TV must be adjusted. The bursts of RGB
video must be synchronized to the rotation of the wheel colors. Use the remote control
to enter the extended service mode (figure 16) and perform the adjustments (shown in
figure 17). The adjustment is correct when the service mode pattern displays a solid
color in all of the three colors tested.
Description
Figure 15 - Color Wheel Output Waveforms
data
clock
Voltage
Frequency
185 Hz
3 Vp-p
16.3 Hz
3 Vp-p
16.3 Hz
21
Location
L2/pin 3
L2/pin 4
L2/pin 5
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