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Frank: Verizon. com says try this: Change your VCR's Channel to 3 or 4. Most blue screen issues are caused by the VCR not being set to Channel 3 or 4. If changing the VCR's channel (using the channel buttons on the VCR or from the VCR remote control) did not change your TV screen, go to step 2.
Make sure your TV is not in Video mode. There are three possible ways to change your TV's mode using your TV remote control: 1) Press a Mode button, toggle through the options and select TV, 2) Press a Video button to change your TV's mode from Video to TV or 3) Press Menu, locate Mode or Audio/Video setup and select TV from one of the options. If you are not sure how to change your TV's mode, see your TV's user guide for more information.
Check to make sure your set-top box is plugged in and turned on.
Sounds like your VCR & TV are on different channels.
The VCR's ouput is channel 3 or 4. Try turning your TV to either channel and see if you get a picture. OR try playing the tape and after 2 or 3 seconds, push the play button again for a few seconds to change the VCR's ouput channel.
i think by accident you have changed the input when you went to change the volume. look for a button labeled " input" or "video" select on the remote and scroll through the various choices. you should get your picture back.
blue screen indicares that there is a problem in blue cathode circuit.
1 blue video output supply.
2 blue video ckt defective
3 signal from chroma ic to blue cathode missing.
4 loose connector
5 crt base loose.
6 chroma ic defective.
I think sound will be ok .
Check the signal type. It may be set incorrectly.
Change the channel. You may be on a blank channel.
Check to see if the TV is tuned to channel 3 or 4 if you are watching a videotape.
Check the TV/VCR button on the VCR is in the correct mode by pressing the TV/VCR button on your VCR.
sounds like 2 different problems here.
first problem sounds tuner related.
second sounds convergence related.
third issue (cost effective to repair ?)
at this point i would replace the set.
i hope this helps
sounds like it is probably worth trying to degauss
check this excellent site;
for details of how to try this on the cheap - it works
If it doesnt solve your problem, the fact that you are getting different quality from different crt s suggests that they could be the root cause - see if you can get the part number, and get a price you may find it is cheap enough to be worth trying - check also the power supply - poor voltage output can sometimes cause these type of symptoms.
Hope this helps, if not post again - some of the other guys know tvs much better than me