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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