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4. One color is missing
Is the OSD color
normal?
One color is missing
No
Yes
Check the output
signal of Scaler.
No
Yes
Is the input
signal normal?
Check the video signal
cable or R,G,B
con-ass’y.
Trouble in the soldering
of R,G,B data lines
from output of ADC
to Scaler(U1).
Yes
No
Yes
Are the
R,G,B Digital values
(every eight bits) correct
on ADC output
stage?
Check the ambient
circuit of ADC.