Because of the color bar signal is still in that chroma channel basic work properly. And striped into its corresponding complementary color, that is: white, blue, red, purple, green, blue, yellow and black. Illustrate chroma decoding output R Y, B Y color difference signal polarity reversal. Is the main cause of decoding output polarity reversal to delay demodulator chrominance signal polarity reverse, such as color push pipe failure make chroma an inverting amplifier and become a true communication; Color push pipe Q501 open, direct line amplitude adjustment of open circuit potential road, etc. i4Vservice manual download site
 i4Vservice manual download site
Boot color measurement push pipe Q501 collector voltage of 11.8 V, the base voltage of 11.3 V, shot is 12 V, seems Q501 saturated. i4Vservice manual download site
 i4Vservice manual download site
Shutdown Q501 collector to ground resistance measurement has been open, shows that the collector voltage with a multimeter resistance as a collector load Q501 work in a saturated state. Because R525 open, chroma from Q5016c knot, and make the color bar order upside down.i4Vservice manual download site