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File name VE710S-2 VE710B-2 VA721 Trouble Shooting.pdf

6. TROUBLE SHOOTING FLOW CHART (VE710s-2/VE710b-2/VA721) 6.1. NO POWER POWER STAR Check 3.3V O/P C825 12V Check P802 5,6 PIN Check P901,P902 PANEL Check 12V O/P C823 Check I901 L901,L903 T901,T902 Q904,Q905 Check F801 D801~D804 Check D822 I802,I803 3.3V Check I901 Check I801 ,Q801 12V MAIN PCB STAR CHECK MAIN PCB 5V OK? N CHECK POWER PCB OK? Y N 3.3V OK? CHECK I103, SUROUND CAP BEAD OK? CHECK I106,I107 SUROUND CAP OK? Y N 1.8V OK? CHECK I104, SUROUND CAP BEAD OK? CHECK I101, SUROUND CAP BEAD OK? 6.2. NO DISPLAY No Display Check Power region Dark Check LED Color Amber Check IO cable is connect OK ? Yes Check I/P signal is in pwr saving state? No Check I106 is OK ? Amber & Green Green Check X102 Crystal 12MHz is working? Yes Refer to NO POWER trouble shoot flow char Press Power key ON/OFF is OK ? (See LED is green or dark.) No Check uP I106 Reset is Ok ? Yes Change I106 Yes No No Check Reset circuit C173,D125 Press "1" key if OSD menu is on display ? Check Keypad pcb is OK ? Yes Check if Inverter is Ok ? No Change Inverter Yes Check I105 MST8016A if HWRST Pin#32 have reset pulse ? Yes Check X101 Crystal 14.318MHz is working ? Yes Check I105 Pin#70,71 data bus have signal Yes Check panel Powers VLCD_3V3 VLCD_12V correct Yes Change LCD panel No No No Check uP I106 pin#17 send reset pulse ? Yes Change X101 Change I105 LCD controller IC