TV comes on and displays the OSD menus. If left alone, power will stay up on the TV. All leds and power supply voltages check correct. When an antenna connection is selected, the video will display for 10 to 20 seconds without any audio then the video blanks out and the power on light goes out. All of the power supply and deflection chassis leds stay lit. A few seconds after that, the power supply crowbars and shuts down. Using the audio test function in the OSD menu (no video input), there is no sound and after a few seconds, the shut down sequence occurs. The DM-1 control module should blink the power led twice when AC power is plugged in, but I do not see this. I removed the main chassis and power supply, checked both with an ESR meter, checked for shorts on the deflection board, used a lighted magnifier to check for cold/cracked solder joints, re-soldered any that even looked dull and repaired a solder bridge on the -13V drive transistor. Any help would be greatly appreciated.
Are you still working on this one? It's been more than 2 months, so I thought someone should check in. If it still isn't working after the last advice given here, can you give us an update of the current status, so we can see if there's any other suggestions to be made?
If your PS waveform drops out it could be your 130v regulator (photo coupler) IP05 Hitachi p/n#2000465... The load would change when simply displaying an OSD to then creating a full screen raster. And something beyond that could be loading it - like the vertical IC601. Do you have a full vertical deflection when you select antenna?
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