Sam4s SAP-630 Series, Service Manual

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6 Troubleshooting
SAM4S SAP-630 SERIES 6-5
6-5 LCD B’D Problem (Boot, LCD Panel, Touch Panel, Rear LCD, LED)
6-5-1 LCD B’D Boot problem
 Related RESET
→ Check the reset signal of ATMEGA8 (U1) input.
→ Check related circuit & component whether short or not.
→ Check the harness Between Main B’D and LCD B’D, if communication is OK or not.
 Related Program
→ The micom(ATMEGA8, U1) has the internal flash to store the program.
→ Check the program is broken or erased.
→ For program download or upgrade, refer the chapter 3.
 Related System Clock
→ Check the crystal, if it operates correctly or not.
→ Clock frequency is 14.7456MHz.
6-5-2 LCD Panel problem
 Operation Fail
→ Performs the LCD panel test at H/W test Utility.
→ Check the power voltage (VLCD3.3V) on LCD B’D.
→ Check the IPEX cable between LCD panel to LCD B’D.
→ Check related circuit & component whether short or not.
→ Check the Micom on LCD B’D whether it works normally or dead.
→ Check the harness between LCD B’D and Main B’D, if communication is OK or not.
6-5-3 Touch panel problem
 Operation Fail
→ Performs the touch panel test at H/W test Utility.
→ Check the FPC harness between touch panel to LCD B’D.
→ Check related circuit & component whether short or not.
→ Check the harness between LCD B’D and Main B’D.
6-5-4 Rear LCD problem
 Operation Fail
→ Performs the Rear LCD test at H/W test Utility.
→ Check the harness between Rear LCD to LCD B’D.
→ Check the harness between LCD B’D to Main B’D.
→ Check related circuit & component whether short or not.
6-5-5 LED B’D problem
 Operation Fail
→ Performs the LED test at H/W test Utility.
→ Check the harness between LED B’D to LCD B’D.
→ Check related circuit & component whether short or not.