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blue screen means 'no signal' or 'signal level is too low' whereas black screen means that there's a signal. Check your antennae, do a factory reset to your unit and then try initial setup.
The blue screen is there when there is no signal. If you connect a TV signal to the VCR, you will see that. When you start playing a tape the tape signal takes over.
blue screen is due to problem in blue video circuit.
please check
1 supply to blue video ckt.
2 crt base loose.
3 components in blue video ckt.
4 loose contact in blue cathode ckt in crt base.
5 blue video transistor.
6 signal coming to blue video from signal processor.
7 signal processor ic.
good luck.
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