ViewSonic VE710b-4 Service Manual page 43

6.2. NO DISPLAY
Check Power
Refer to NO POWER
trouble shoot flow char
ViewSonic Corporation
No
Display
Dark
Check LED Color
region
Green
Press Power key
ON/OFF is OK ?
(See LED is green or
dark.)
Press "1" key if OSD
menu is on display ?
Check I105
MST8016A if
HWRST Pin#32 have
reset pulse ?
Check X101 Crystal
14.318MHz is
working ?
Check I105
Pin#70,71 data bus
have signal
Check panel Powers
VLCD_3V3
VLCD_12V
correct
Change LCD panel
Amber
Check IO cable is
connect OK ?
Amber & Green
Check X102 Crystal
12MHz is working?
Yes
No
Check uP I106
Reset is Ok ?
Yes
No
Check Keypad
pcb is OK ?
Yes
Check if
Inverter is Ok ?
Yes
Check uP I106
No
pin#17 send reset
pulse ?
Yes
Yes
No
Change X101
Yes
No
Change I105 LCD
controller IC
Yes
Yes
40
Confidential - Do Not Copy
Yes
Check I/P signal is in
pwr saving state?
No
Check I106 is OK ?
Yes
Change
I106
No
Check Reset circuit
C173,D125
No
Change
Inverter
VE710s-4_VE710b-4