Display Backlight - Motorola 6864115B62-C Detailed Service Manual

3-12
3.6

Display Backlight

Power Up Alert Tone is audible, volume knob does operate,
display is on but no display backlight.
U0871 Pin 24
is toggling ?
YES
Base of Q0963
> 0.7V ?
YES
Collector of
Q0963
>5V & < 11V
?
YES
Check / Replace
Q0961 / R0975 / R0977
TROUBLESHOOTING CHARTS
Check for shortage
NO
Check / Replace
NO
R0965 / C0963 / R0967
Check / Replace
Q0963 / U0941 / R0961
NO
R0963 / R0969 / R0971
U0871