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Is Er-CO displayed?
Yes
Yes
Yes
Yes
No
Yes
No
No
No
Display PCB
Is the connection loose?
MAIN
PCB
DISPLAY
PCB
1
2
3
4
Hinge
RD(Rx)
BN(Tx)
BO(GND)
WH/BK(12V)
RD(Tx)
BN(Rx)
BO(GND)
WH/BK(12V)
1
2
3
4
6
5
4
3
CON5 CON101
1
2
3
4
* Rx: Receiver
Tx: Transmitter
Replace the
Display PCB
Display PCB
Is the voltage between
pins 4 and pin 5 of
CON101?
pin5 BO
pin4 BN
Reconnect
Reconnect
Replace
Display PCB
Display PCB
Is the voltage between
pin3 and pin5 of CON101
0 V or 5 V?
Pin5 BO
Pin3 RD
Is the joint connection
loose In the Hinge?
Wiring diagram
Transmitter Voltages
Receiver fail Voltages
Communication Error
0 V or 5 V
pin4 to pin5
RessultTest Point
0 V or 5 V
pin3 to pin5
RessultTest Point