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4 flashes is loss of vertical deflection. Check IC561 for 12 volts at pin one.
7 blinks = Horizontal Deflection Stopped.
Horizontal Deflection Stopped Occurs when either:
1) a +B overcurrent is detected (IC5007), or
2) overheating is detected (Thermistor TH5002)
I searched the web and this is what I got. You should get a service manual.
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