Main Display Failure - Motorola APX 7000 Detailed Service Manual

Troubleshooting Charts: Main Display Failure
5.6.2 For Display Part No. 72012006002 Only
Check DC on R2301
2.7V < V < 2.9V?
Proceed to DC
No Display
Replace LCD
Yes
Problem
Resolved?
No
both sides
Yes
No
Flowchart
End
Check DC on R2302
No
1.8V < V < 2.0V?
Yes
Check LCD_HSYNC (R2304),
LCD_VSYNC (R2303),
LCD_PCLK (R2305),
LCD_OE (R2306), CS
(MNCN6202:J2301, Pin 50)
No
Signals Present?
Yes
Check Vocon, Keypad,
and Display
Connectors
No
Connectors
Good?
Yes
Replace Back Chassis
Subassembly
Proceed to DC
Flowchart
Replace Vocon
Board
Replace Board/
FPC Containing
Connectors
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