Do NOT take your Cybiko apart & play with the LCD !

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 by Jeff Frohwein, v1.0123



 In my quest to figure out how the cybiko LCD screen

interfaces to the main circuit board, I disassembled

my unit completely. I Then attempted to pry the LCD

loose from the board it was mounted on. It was held

in place by two small plastic "hooks." Once these

hooks gave way, the LCD cable was extended beyond

it's ability to safely flex. The result? THE DISPLAY

NO LONGER WORKS! Ugh... Now I've got a totally useless

cybiko. Well.. maybe not totally useless. I might

can use it for a CyWIG setup on the PC side because

everything else still works.



 The plus side of all of this is that I was able to

locate the part number for the LCD display chip that

was otherwise hidden under the cable itself. The

actual display chip is mounted on the flexible LCD

cable and is a Hitachi HD66421 part. It has internal

display RAM and handles the complex LCD display signals

necessary to update the LCD itself. Here are various

web links that offer more information on this part:



 http://www1.hitachi.com.hk/eng/publications/npb/21-04.htm

 http://global.hitachi.com/New/cnews/E/1998/980907B.html

 http://www.hitachi-eu.com/hel/ecg/products/micro/lcd_lineup.htm



Jeff