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The 1v2 gets it's heater voltage from a winding on the flyback, if the B+ is low then the high voltage is low, hence the heater voltage to the 1V2 will be low.
You have a picture on the screen so the 1V2 is getting enough heater voltage to work, the picture being shrunken and distorted indicates a power supply problem.
Possibly the Selenium Rectifier has gone bad, do you have a volt meter? You will need to start checking voltages, starting with the B+.
When things like this happen it's usually caused by something that got hooked up wrong (been there done that) I would check your work carefully, make sure there are no Solder bridges between circuits.
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