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CTC210/211 Video Troubleshooting (YUV)
Setup for video troubleshooting: · Color Bar generator capable of multi-sync · Oscilloscope · DVM No Video any mode (Video Processing) 1. Access user menu and look for OSD. 2. If OSD present go to Video Switching circuit. 3. Inject color bar signal on High Resolution Input and check for signal at U22300-51, 52, and 53. 4. No signal on U22300-51, 52 and 53, check Video Switching circuit U22401 and U38200. 5. Signal present on U22300-51, 52 and 53 check blanking pins 24 and 25 of U22300 for proper signal and DC voltage. 6. If Voltage missing, check blanking circuit. 7. Check U22300-32 for proper 3.5V DC. 8. Voltage low check Q22305 and associated circuits. 9. Check U22300-36 OSD FS for 0V dc. NOTE: DC on this pin will result in blanking of video. Signal should only be present when OSD is displayed. 10. Check U22300-41, 42 and 43 for signal. 11. No signal suspect U22300 12. Signals present check CRT drive circuit. NOTE: Video in any one mode will indicate U22300 is working and the video switching circuit becomes suspect.
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