Motorola 6864115B62-C

3-10 TROUBLESHOOTING CHARTS
3.4 Display
TP0973
Voltage Sense
between
2V and 2.4V
?

Activity on
Address & Data lines
A0 / D0...D7 / CS1
of U0971
?

NO
YES
YES
NO
Check / Replace
Flex connection
Resistors on Address & Data
lines and LCD Module


Check / Replace 
LCD Module
Check for shortage
U0871

Power Up Alert Tone is audible, volume knob does operate,
indicator/backlight is on but nothing is seen on the display.