
Originally Posted by
Strephon Alkhalikoi
......... if reseating the cable doesn't fix it, the only alternative may be to replace the screen.
I'm pretty sure that's his intent if the 'known-good' screen from the non-LM 1440 works ok in the LM unit. 
Replacement screens for 14xx aren't very expensive. Example on ebay with ww postage included ~$25:
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If the problem's originating from the PCB though, no point going any further than cleaning the screen ribbon connector imo.
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