input on D-Sub R,G,B connector.
Failure point
1) No R, G and B video signal output from hos
computer. Check computer.
2) Video signal cable disconnection.
Check the R,B,G input signals on U405 pins
135, 131, 127,respectively that their level is
0.7Vp-p typical.
Failure point
Printed wire broke between D-Sub(R,G,B) and
U405 pins 135,131,127.
Proceed section 7 “Checking the scaling IC movement”.
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