I specialize in this 510/610/710 l series, owners all over the country send me their power supply boards for permanent stablization and the lifetime warranty, since the power supply boards on these sets eventually suffer from cold solder joints and resulting intermittent operations.
Fortunately, that condition is eminently - and permanently - correctable in an afternoon.
I perform both types of overscan correction: service menu only or shimming operation plus service mode, your choice. IF the shimming op can still be done on your set. I'll have to examine it to know for sure. The shimming op is always the best way if possible, but if not the service menu only method is always available.
Fully calibrating CRT technology is becoming a lost art, yet I still love it. There's lots more to do on CRT units, but the extra time is phenomenally worth it. I just calibrated a 710 for Tom Johnson, recording engineer for the San Jose Symphony. You asked for a recommendation, he was glad to give me one, it is in his testimonial on my YouTube channel, "mrbobbigscreen".
Among many things not covered in the standard ISF calibration but essential to any CRT calibration, your 710 will require realignment of the energies getting to the guns for proper calibration of user Black Levels. On this series their User black level zero point eventually becomes no longer strong enough to present excellent shadow detail and must be cranked up, which slews the grey scale off.
The incredibly dirty optics on a 12 year old CRT also factor in on the shadow detail. There are 28 optical surfaces in the light path, 10 of which get incredibly dirty by this time in your set's life, causing your picture to be very bleary rather than crisp and dynamic, like when it was new. Luckily that as well can be completely remedied in an afternoon, to where your set again has the same crystal clear light path as when it was new, resulting in a sparkling picture with deep inky blacks again, even at 12 years old. I guaranty it.
Correcting all this for excellent shadow detail at User zero point and restoring the dynamic punch to your picture is not taught in ISF courses but the more technical parts of the realignment needed come naturally enough if you are a service repair tech. It only takes an extra hour to perform. I throw this in with my calibrations, no extra charge.
Would love to travel to you to get this taken care of for you.
Edited by Mr Bob - 10/26/12 at 8:40am