Calibrating screen Tomtom

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Thanks, I've found a "how to" replace a digitiser pdf you posted years ago and a digitiser on eBay for £6.60. I still wonder why the TT cannot store and use new calibration data when I change the cal.txt file. But it's worth trying a new digitiser for only £6.60!
I will update here on the outcome when I've tried to fit it.

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"Back from the Dead!"
Happy to report the digitiser replacement has resurrected my Go 720. Needs delicate soldering as the solder points are close together. Don't even bother unless you have a slim solder tip and probably a solder station which controls the temperature. Also, not in the "how to do it" , the old digitiser and glass is glued to a slim metal frame and it needs to be separated as the frame is needed for the new digitiser. This also needs double sided adhesive tape to locate the new digitiser to the metal frame.
For anyone interested, the calibration was perfect as soon as I started the Go 720 (without any cal.txt or calib.txt files. Makes me think that all the calibration tips are probably temporary fixes for digitising screens which are on their way out anyway.
Many thanks to those who helped.

Greetings,
Can you please post a link to the "how to" replace a digitiser pdf, I have the same problem with my GO730.
Thanks