Motorola GM140

3-6 TROUBLESHOOTING CHARTS
2.4 Backlight
Power Up Alert Tone is OK, volume knob does operate,
indicator/display is on but no backlight
NO
YES
YES
NO
U0831 Pin 58
is toggling ?
Base of
Q0934
> 0.7V ?
Check / Replace
R0847 / C0843 / R0943
Check for shortage
U0831
YES
NO
Collector of
Q0934
>5V and < 11V ?
Check / Replace
Q0934 U0931 /R0941 /
R0942 / R0944 / R0945
Check / Replace
Q0933 / R0947 / R0948