Sam4s NR-500R, Service Manual

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8 Troubleshooting
SAM4S NR-500 SERIES 8-3
8-3 LCD Display Problem
End
LCD Problem
LCD Display
OK?
Y
N
1. Check the D/I Signal (CPU P9.0)
2. Check the SCLK Signal (CPU P9.1)
3. Check the SDAT Signal (CPU P4.7)
4. Check the Harness.
Power VDD3.3V,
Ok?
1. Refer to the Power Problem.
2. Check the Harness.
LCD PBA
Assy Ok?
Y
1. Check the LCD.
2. Check and Replace the LCD MODULE PBA.
3. Check the LCD Harness.
N
Y
N
Back Light
OK?
N
Y
1. Check the LCDBL_ONOFF signal(CPU P8.6).
: It controls LCD back light ON/OFF.
2. Check the KSA1182(Q15,Q21),MMBT222A(Q22) and
related Circuit.
3. Check the LCD Backlit harness Status.
Disconnect
Ok?
Y
1. Check the Harness.
2. Check the LCD Disconnection Signal Pattern.
N