Main Display Failure - Motorola APX 7000 Detailed Service Manual

5-20
5.6

Main Display Failure

5.6.1 For All Display Except Part No. 72012006002
No Display
Replace LCD
Resolved?
Check DC on R2301
both sides
2.7V < V < 2.9V?
Proceed to DC
Flowchart
Yes
Problem
No
Yes
Check DC on R2302
No
Check RGB Interface
Timing Waveforms
Check Vocon, Keypad,
Replace Back Chassis
Troubleshooting Charts: Main Display Failure
End
No
1.8V < V < 2.0V?
Yes
Check SPI CLK
(R2325), Data
(R2326), and CS
(MNCN6200: J2301, Pin 34
MNCN6202: J2301, Pin 50)
No
Signals Present?
Yes
No
Signals Present?
Yes
and Display
Connectors
No
Connectors
Good?
Yes
Subassembly
Proceed to DC
Flowchart
Replace Vocon
Board
Replace Vocon
Board
Replace Board/
FPC Containing
Connectors