Samsung AW0693L - Troubleshooting Membrane Keypad and LED Display Issues

Samsung Electronics 5-3
Troubleshooting
5-2-2 When the Membrane Key pad and Led Display
1) Check points
(1) Is the voltage of the power source normal ? (the rating voltage ±10% range.)
(2) Is the electric wire in good contact ?(CN71, RY71)
(3) Is the connection of the assembly main PCB, and MEMBRANE KEY PAD in good
contact? (CN91)
Check the micom
(IC04) for a short,
and replace it.
Check the micom
(IC04) for a short,
and replace it.
Check the IC07
for a short,
and replace it.
Check the micom
(IC04) for a short,
and replace it.
Normal operation
Check the micom
(IC04) for a short,
and replace it.
Replace the LED Display
Replace the membrane
key pad.
Y
N
Normal operation
N
N
N
N
N
N
Y
YY
YY
Y
Turn off the power, and then turn it on again
five seconds later.
When the LED display is
not operated.
When the membrane key is
not operated.
Is the voltage of the micom
(IC04) No.1, 2, 39~43 port a
square wave?
Is the voltage of the
micom (IC04) No.13, 28 port
a square wave?
Is the voltage of the micom
(IC04) No.3, 4, 10, 11, 44 port
a square wave?
Is the voltage of the micom
(IC04) No.3, 4, 10, 11, 44
port a square wave?
Is the voltage of the
IC07 No. 10~16 square wave?
DB98_04511A(2)-2 2/18/03 4:12 PM Page 5-3